Over the last few years it has become increasingly clear that the physical interaction of inflammatory leukocytes with each other and other cells of the body plays an important role in regulating immune and inflammatory responses [Springer, T. A., Nature, 346, 425, (1990); Springer, T. A., Cell, 76, 301, (1994)]. Specific cell surface molecules collectively referred to as cell adhesion molecules mediate many of these interactions.

The adhesion molecules have been sub-divided into different groups on the basis of their structure. One family of adhesion molecules which is believed to play a particularly important role in regulating immune and inflammatory responses is the integrin family. This family of cell surface glycoproteins has a typical non-covalently linked heterodimer structure. At least 16 different integrin alpha chains and 8 different integrin beta chains have been identified [Newman, P. et al, Molecular Medicine Today, 304, (1996)]. The members of the family are typically named according to their heterodimer composition although trivial nomenclature is widespread in the field. Thus the integrin a4p1 consists of the integrin alpha 4 chain associated with the integrin beta 1 chain, but is also widely referred to as Very Late Antigen 4 or VLA-4. Not all of the potential pairings of integrin alpha and beta chains have yet been observed in nature and the integrin family has been subdivided into a number of subgroups based on the pairings that have been recognised to date [Sonnenberg, A., Current Topics in Microbiology and Immunology, 184, 7, (1993)].

The importance of integrin function in normal physiological responses is highlighted by two human deficiency diseases in which integrin function is defective. Thus in the disease termed Leukocyte Adhesion Deficiency (LAD) there is a defect in one of the families of integrins expressed on leukocytes [Marlin, S. D. et al, J. Exp. Med. 164, 855, (1986)]. Patients suffering from this disease have a reduced ability to recruit leukocytes to inflammatory sites and suffer recurrent infections, which in extreme cases may be fatal. In the case of patients suffering from the disease termed Glanzman's thrombasthenia (a defect in a member of the beta 3 integrin family) there is a defect in blood clotting (Hodivala-Dilke, K. M., J. Clin.

Invest. 103, 229, (1999)].

The potential to modify integrin function in such a way as to beneficially modulate cell adhesion has been extensively investigated in animal models using specific antibodies and peptides that block various functions of these molecules [e. g. Issekutz, T. B., J. Immunol. 149, 3394, (1992); Li, Z. et al, Am. J. Physiol. 263, L723, (1992); Mitans, F. et al, J. Cell Sci.

108, 2825, (1995); Brooks, P. C. et al, J. Clin. Invest. 96,1815, (1995); Binns, R. M. et al, J. Immunol. 157, 4094, (1996); Hammes, H.-P. et al, Nature Medicine 2,529, (1996); Srivata, S. et al, Cardiovascular Res. 36, 408 (1997)]. In particular an anti cpy-antibody has demonstrated both clinical and histologic improvement of inflammatory activity and disease in a non-human primate model of inflammatory bowel disease [Hesterberg, P. E. et al, Gastroenterol, 111, 1373-80 (1996)]. A number of monoclonal antibodies which block integrin function are currently being investigated for their therapeutic potential in human disease, and one, ReoPro, a chimeric antibody against the platelet integrin at ! bp3 is in use as a potent anti- thrombotic agent for use in patients with cardiovascular complications following coronary angioplasty.

Integrins recognize both cell surface and extracellular matrix ligands, and ligand specificity is determined by the particular alpha-beta subunit

combination of the molecule [Newman, P., ibid]. One particular integrin subgroup of interest involves the a4 chain which can pair with two different beta chains p1 and p7 [Sonnenberg, A., ibid]. The α4ß1 pairing occurs on many circulating leukocytes (for example lymphocytes, monocytes, eosinophils and basophils) although it is absent or only present at low levels on circulating neutrophils. a4p1 binds to an adhesion molecule (Vascular Cell Adhesion Molecule-1 also known as VCAM-1) frequently up-regulated on endothelial cells at sites of inflammation [Osborne, L., Cell, 62, 3, (1990)]. The molecule has also been shown to bind to at least three sites in the matrix molecule fibronectin [Humphries, M. J. et al, Ciba Foundation Symposium, 189, 177, (1995)]. Based on data obtained with monoclonal antibodies in animal models it is believed that the interaction between a4p1 and ligands on other cells and the extracellular matrix plays an important role in leukocyte migration and activation [Yednock, T. A. et al, Nature, 356, 63, (1992); Podolsky, D. K. et al, J. Clin. Invest. 92,372, (1993); Abraham, W. M. et al, J. Clin. Invest. 93,776, (1994)].

The integrin generated by the pairing of α4 and p7 has been termed LPAM-1 [Holzmann, B. and Weissman, I. L., EMBO J. 8,1735, (1989)].

The oe4ß7 pairing is expressed on certain sub-populations of T and B lymphocytes and on eosinophils [Erle, D. J. et al, J. Immunol. 153, 517 (1994)]. Like oc4ß1, α4ß7 binds to VCAM-1 and fibronectin. In addition, oc4ß7 binds to an adhesion molecule believed to be involved in the homing of leukocytes to mucosal tissue such as gastrointestinal mucosa termed MAdCAM-1 [Berlin, C. et al, Cell, 74,185, (1993)]. MAdCAM-1 is preferentially expressed in the gastrointestinal track. The interaction between oc4ß7 and MAdCAM-1 may also be important at sites of inflammation outside of mucosal tissue [Yang, X.-D. et al, PNAS, 91, 12604, (1994)].

Regions of the peptide sequence recognized by a4p1 and oc4ß7 when they bind to their ligands have been identified. a4p1 seems to recognise LDV, IDA or REDV peptide sequences in fibronectin and a QIDSP sequence in VCAM-1 [Humphries, M. J. et al, ibiaq whilst a4ß7 recognises a LDT sequence in MAdCAM-1 [Birskin, M. J. et al, J. Immunol. 156, 719, (1996)]. There have been several reports of inhibitors of these interactions being designed from modifications of these short peptide sequences [Cardarelli, P. M. et al, J. Biol. Chem., 269, 18668, (1994); Shorff, H. N. et al, Biorganic Med. Chem. Lett., 6,2495, (1996); Vanderslice, P. et al, J.

Immunol., 158, 1710, (1997)]. It has also been reported that a short peptide sequence derived from the a4 (31 binding site in fibronectin can inhibit a contact hypersensitivity reaction in a trinitrochlorobenzene sensitised mouse [Ferguson, T. A., et al, PNAS, 88,8072, (1991)].

Since the alpha 4 subgroup of integrins are predominantly expressed on leukocytes their inhibition can be expected to be beneficial in a number of immune or inflammatory disease states. However, because of the ubiquitous distribution and wide range of functions performed by other members of the integrin family it is important to be able to identify selective inhibitors of the alpha 4 subgroup.

We have now found a group of compounds which are potent and selective inhibitors of a4 integrins. Members of the group are able to inhibit a4 integrins such as a4p1 and/or (x4ß7 at concentrations at which they generally have no or minimal inhibitory action on a integrins of other subgroups. These compounds possess the additional advantages of good pharmacokinetic properties, especially low plasma clearance and good absorption properties making them particularly suitable for oral dosing.

Thus according to one aspect of the invention we provide a compound of formula (1):

wherein R1 is a group Ar1 L2Ar2Alk-in which: Ar1 is an optionally substituted aromatic or heteroaromatic group; L2 is a covalent bond or a linker atom or group; Ar2 is an optionally substituted arylene or heteroarylene group; and Alk is a chain - CH2-CH (R)-,-CH=C (R)- or in which R is a carboxylic acid (-C02H) or a derivative or biostere thereof; X is an-O-or-S-atom or-N (R2)- group in which: R2 is a hydrogen atom or a C1 6alkyl group; V is an oxygen (O) or sulphur (S) atom; Rx, RY and Rz which may be the same or different is each an atom or group ~L1 (Alk1) n (R3) v in which L1 is a covalent bond or a linker atom or group, Alk1 is an optionally substituted aliphatic or heteroaliphatic chain, R3 is a hydrogen or halogen atom or group selected from-OR3a [where R3a is a hydrogen atom or an optionally substituted straight or branched C1 6alkyl group or C3gcycloalkyl group],-SR3a,-CN or an optionally substituted cycloaliphatic, heterocycloaliphatic, polycycloaliphatic, heteropolycycloaliphatic, aromatic or heteroaromatic group, n is zero or the integer 1 and v is the integer 1,2 or 3 provided that when n is zero and U is a covalent bond v is the integer 1;

or Rz is an atom or group as previously defined and Rx and RY are joined together to form an optionally substituted spiro linked cycloaliphatic or heterocycloaliphaticgroup; and the salts, solvates, hydrates and N-oxides thereof.

It will be appreciated that compounds of formula (1) may have one or more chiral centres, and exist as enantiomers or diastereomers. The invention is to be understood to extend to all such enantiomers, diastereomers and mixtures thereof, including racemates. Formula (1) and the formulae hereinafter are intended to represent all individual isomers and mixtures thereof, unless stated or shown otherwise. In addition, compounds of formula (1) may exist as tautomers, for example keto (CH2C=O)-enol (CH=CHOH) tautomers. Formula (1) and the formulae hereinafter are intended to represent all individual tautomers and mixtures thereof, unless stated otherwise.

Optionally substituted aromatic groups represented by Ar1 when present in the group R1 include for example optionally substituted monocyclic or bicyclic fused ring C6 12aromatic groups, such as phenyl, 1-or 2-naphthyl, 1-or 2-tetrahydronaphthyl, indanyl or indenyl groups.

Optionally substituted heteroaromatic groups represented by the group Ar1 when present in the group R1 include for example optionally substituted C1 gheteroaromatic groups containing for example one, two, three or four heteroatoms selected from oxygen, sulphur or nitrogen atoms. In general, the heteroaromatic groups may be for example monocyclic or bicyclic fused ring heteroaromatic groups. Monocyclic heteroaromatic groups include for example five-or six-membered heteroaromatic groups containing one, two, three or four heteroatoms selected from oxygen, sulphur or nitrogen atoms. Bicyclic heteroaromatic groups include for example eight-to thirteen-membered fused-ring

heteroaromatic groups containing one, two or more heteroatoms selected from oxygen, sulphur or nitrogen atoms.

Particular examples of heteroaromatic groups of these types include <BR> <BR> <BR> <BR> pyrrolyl, furyl, thienyl, imidazolyl, N-C1-6alkylimidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, 1,3,4-thiadiazole, pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, benzofuryl, [2,3-dihydro] benzofuryl, [2,3- dihydro] benzothienyl, benzothienyl, benzotriazolyl, indolyl, isoindolyl, benzimidazolyl, imidazo [1,2-a] pyridyl, benzothiazolyl, benzoxazolyl, benzisoxazolyl, benzopyranyl, [3,4-dihydro] benzopyranyl, quinazolinyl, quinoxalinyl, naphthyridinyl, e. g. 2,6-naphthyridinyl, or 2,7-naphthyridinyl, pyrido [3,4-b] pyridyl, pyrido [3,2-b] pyridyl, pyrido [4,3-b] pyridyl, quinolinyl, isoquinolinyl, tetrazolyl, 5,6,7,8-tetrahydroquinolinyl, 5,6,7,8-tetrahydro- isoquinolinyl, and imidyl, e. g. succinimidyl, phthalimidyl, or naphthalimidyl such as 1,8-naphthalimidyl.

Each aromatic or heteroaromatic group represented by the group Ar1 may be optionally substituted on any available carbon or, when present, nitrogen atom. One, two, three or more of the same or different substituents may be present and each substituent may be selected for example from an atom or group-L3 (Alk2) tL4 (R4) u in which L3 and L4, which may be the same or different, is each a covalent bond or a linker atom or group, t is zero or the integer 1, u is an integer 1,2 or 3, Alk2 is an optionally substituted aliphatic or heteroaliphatic chain and R4 is a hydrogen or halogen atom or a group selected from optionally substituted C1-6alkyl or C3-8cycloalkyl,-OR5 [where R5 is a hydrogen atom, an optionally substitued C1 6alkyl or C3-gcycloalkyl group],-SR5,-NR5R6 [where R6 is as just defined for R5 and may be the same or different],- <BR> <BR> <BR> N02,-CN,-C02R5,-S03H,-SOR5,-SO2R5,-S03R5,-OC02R5,-

CONR5R6,-OCONR5R6,-CSNR5R6,-COR5,-OCOR5,-N (R5) COR6,- N (R5) CSR6,-S02N (R5) (R6),-N (R5) SO2R6, N (R5) CON (R6) (R7) [where R7 is a hydrogen atom, an optionally substituted C1-6alkyl or C3-8cycloalkyl group],-N (R5) CSN (R6) (R7) or-N (R5) SO2N (R6) (R7), provided that when t is zero and each of L3 and L4 is a covalent bond then u is the integer 1 and R4 is other than a hydrogen atom.

When L3 and/or L4 is present in these substituents as a linker atom or group it may be any divalent linking atom or group. Particular examples include-O-or-S-atoms or-C (O)-,-C (O) O-, -OC (O)-,-C (S)-,-S (O)-,- S (O) 2-,-N (R8)- [where R8 is a hydrogen atom or an optionally substituted straight or branched Chalky ! group],-CON (R8)-,-OC (O) N (R8)-,- CSN (R8)-,-N (R8) CO-,-N (R8) C (O) O-,-N (R8) CS-,-S (O) 2N (R8)-, - N (R8) S (0) 2-,-N (R8) 0-,-ON (R8)-,-N (R8) N (R8)-,-N (R8) CON (R8)-,- N (R8) CSN (R8)-, or-N (R8) S02N (R8)- groups. Where the linker group contains two R8 substituents, these may be the same or different.

When R3a, R4, R5, R6, R7 and/or R8 is present as a C1-6alkyl group it may be a straight or branched C1 6alkyl group, e. g. a C1 3alkyl group such as a methyl, ethyl or i-propyl group. Cs-scydoatky) groups represented by R3a, R4, R5, R6 and/or R7 include C36cycloalkyl groups e. g. cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl groups. Optional substituents which may be present on such alkyl or cycloalkyl groups include for example one, two or three substituents which may be the same or different selected from halogen atoms, for example fluorine, chlorine, bromine or iodine atoms, or hydroxy or C1 6alkoxy e. g. methoxy or ethoxy groups.

When the groups R5 and R6 or R6 and R7 are both C1-6alkyl groups these groups may be joined, together with the N atom to which they are attached, to form a heterocyclic ring. Such heterocyclic rings may be

optionally interrupted by a further heteroatom selected from-O-,-S-or- N (R5)-. Particular examples of such heterocyclic rings include piperidinyl, morpholinyl, thiomorpholinyl, pyrrolidinyl, imidazolidinyl and piperazinyl rings.

When Alk2 is present as an optionally substituted aliphatic or heteroaliphatic chain it may be any optionally substituted aliphatic or heteroaliphatic chain as described hereinafter for Alk1 Halogen atoms represented by R4 in the optional Ar1 substituents include fluorine, chlorine, bromine, or iodine atoms.

Examples of the substituents represented by-L3 (Alk1) tL4 (R4) u when present in Ar1 groups in compounds of the invention include atoms or groups -L3Alk2L4R4, -L3Alk2R4, -L3R4, -R4 and -Alk2R4 wherein L3, Alk2, L4 and R4 are as defined above. Particular examples of such substituents include-L3CH2L4R4,-L3CH (CH3) L4R4,-L3 (CH2) 2L4R4,-L3CH2R4,- L3CH (CH3) R4,-L3 (CH2) 2R4,-CH2R4,-CH (CH3) R4,- (CH2) 2R4 and-R4 groups.

Thus Ar1 in compounds of the invention may be optionally substituted for example by one, two, three or more halogen atoms, e. g. fluorine, chlorine, bromine or iodine atoms, and/or C1 6alkyl, e. g. methyl, ethyl, n-propyl, i- propyl, n-butyl or t-butyl, Cs-gcydoatkyt, e. g. cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl, C1 6hydroxyalkyl, e. g. hydroxymethyl, hydroxyethyl or-C (OH) (CF3) 2, carboxyC1 6alkyl, e. g. carboxyethyl, C1 6alkylthio e. g. methylthio or ethylthio, carboxyC1 6alkylthio, e. g. carboxymethylthio, 2-carboxyethylthio or 3-carboxypropylthio, C-6alkoxy, e. g. methoxy or ethoxy, hydroxyC1-6alkoxy, e. g. 2-hydroxyethoxy, halo1 6alkyl, e. g.-CF3,-CHF2,-CH2F, haloC1-6alkoxy, e. g.-OCF3,-OCHF2,-

OCH2F, C1-6alkylamino, e. g. methylamino or ethylamino, amino (-NH2), aminoCl-6alkyl, e. g. aminomethyl or aminoethyl, C1 6dialkylamino, e. g. dimethylamino or diethylamino, C1-6alkylaminoC1-6alkyl, e. g. ethy- laminoethyl, C1-6dialkylaminoC1-6alkyl, e. g. diethylaminoethyl, aminoC1- 6alkoxy, e. g. aminoethoxy, C1-6alkylaminoC1-6alkoxy, e. g. methylamino- ethoxy, C1-6dialkylaminoC1-6alkoxy, e. g. dimethylaminoethoxy, diethyl- aminoethoxy, diisopropylaminoethoxy or dimethylaminopropoxy, nitro, cyano, amidino, hydroxyl (-OH), formyl [HC (O)-], carboxyl (-C02H),- C02R5 e. g.-C02CH3 or-C02C (CH3) 3, C1 6alkanoyl e. g. acetyl, thio (- SH), thioC1-6alkyl, e. g. thiomethyl or thioethyl, sulphonyl (-S03H),-S03R5, C-6alkylsulphinyl, e. g. methylsulphinyl, C1-6alkylsulphonyl, e. g. methylsulphonyl, aminosulphonyl (-SO2NH2), C1-6alkylaminosulphonyl, e. g. methylaminosulphonyl or ethylaminosulphonyl, C1-6dialkylamino- sulphonyl, e. g. dimethylaminosulphonyl or diethylaminosulphonyl, phenyl- aminosulphonyl, carboxamido (-CONH2), C1-6alkylaminocarbonyl, e. g. methylaminocarbonyl or ethylaminocarbonyl, C1 6dialkylaminocarbonyl, e. g. dimethylaminocarbonyl or diethylaminocarbonyl, aminoCl-6alkyl- aminocarbonyl, e. g. aminoethylaminocarbonyl, C1-6alkylaminoCl-6alkyl- aminocarbonyl, e. g. ethylaminoethylaminocarbonyl, C1-6dialkylaminoC1- 6alkylaminocarbonyl, e. g. diethylaminoethylaminocarbonyl, amino- carbonylamino, C1-6alkylaminocarbonylamino, e. g. methylaminocarbonyl- amino or ethylaminocarbonylamino, C1-6dialkylaminocarbonylamino, e. g. dimethylaminocarbonylamino or diethylaminocarbonylamino, Cl- 6alkylaminocabonylC1-6alkylamino, e. g. methylaminocarbonylmethyl- amino, aminothiocarbonylamino, C1-6alkylaminothiocarbonylamino, e. g. methylaminothiocarbonylamino or ethylaminothiocarbonylamino, C1 6dialkylaminothiocarbonylamino, e. g. dimethylaminothiocarbonylamino or <BR> <BR> <BR> <BR> diethylaminothiocarbonylamino, C1-6alkylaminothiocarbonylCi-6alkyl- amino, e. g. ethylaminothiocarbonylmethylamino, C-6alkylsulphonylamino, e. g. methylsulphonylamino or ethylsulfphonylamino, C1-6dialkyl-

sulphonylamino, e. g. dimethylsulphonylamino or diethylsulphonylamino, aminosulphonylamino (-NHS02NH2), C1 6alkylaminosulphonylamino, e. g. methylaminosulphonylamino or ethylaminosulphonylamino, Ci-6dialkyl- aminosulphonylamino, e. g. dimethylaminosulphonylamino or diethyl- aminosulphonylamino, C1 6alkanoylamino, e. g. acetylamino, aminoCi- 6alkanoylamino e. g. aminoacetylamino, C1 6dialkylaminoC1 6alkanoyl- amino, e. g. dimethylaminoacetylamino, C1-6alkanoylaminoCl-6alkyl, e. g. acetylaminomethyl, C1-6alkanoylaminoC1-6alkylamino, e. g. acetamido- ethylamino, C1 6alkoxycarbonylamino, e. g. methoxycarbonylamino, ethoxycarbonylamino or t-butoxycarbonylamino groups.

L2 when present as part of the group Rl in compounds of the invention may be a linker atom or group L2a or a linker- (Alk3) L2a-, where Alk3 is an optionally substituted aliphatic or heteroaliphatic chain which may be any such chain as described hereinafter for Alk1, and L2a may be any linker atom or group as described hereinbefore for L3.

Optionally substituted arylene groups represented by Ar2 when present as part of the group Rl include those aromatic groups as previously described for Ar1.

Optionally substituted heteroarylene groups represented by Ar2 when present as part of the group Rl include those heteroaromatic groups as previously described for Ar1 Each divalent arylene or heteroarylene group represented by Ar2 may be attached to the remainder of the molecule through any available ring carbon or nitrogen atoms.

The arylene and heteroarylene groups represented by Ar2 may be optionally substituted by one, two or more substituents selected from the

atoms or groups-L3 (Alk2) tL4 (R4) u described herein. Where two of these atoms or groups are present they may be the same or different.

When the group R2 is present in compounds of the invention as a Ci- 6alkyl group it may be for example a straight or branched C1 6alkyl group e. g. a C1 3alkyl group such as a methyl or ethyl group.

When the group R is present in R1 in compounds of the invention as a derivative of a carboxylic acid it may be for example an acyclic or cyclic carboxylic acid ester or an amide. Particular acyclic esters and amides include-C02Alk7 and-CONR5R6 groups as defined herein. When R is a biostere of a carboxylic acid it may be for example a tetrazol or other acid such as phosphonic acid, phosphinic acid, sulphonic acid, sulphinic acid or boronic acid or an acylsulphonamide group.

Esters (-C02Alk7) and amide (-CONR5R6) derivatives of the carboxylic acid group (-C02H) in compounds of formula (1) may advantageously be used as prodrugs of the active compound. Such prodrugs are compounds which undergo biotransformation to the corresponding carboxylic acid prior to exhibiting their pharmacological effects and the invention particularly extends to prodrugs of the acids of formula (1). Such prodrugs are well known in the art, see for example International Patent Application No. WO00/23419, Bodor, N. (Alfred Benzon Symposium, 1982,17,156- 177), Singh, G. et al (J. Sci. Ind. Res., 1996,55,497-510) and Bundgaard, H., (Design of Prodrugs, 1985, Elsevier, Amsterdam).

Esterified carboxyl groups represented by the group-CO2Alk7 include groups wherein Alk7 is a straight or branched optionally substituted Ci- galkyl group such as a methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s- butyl, t-butyl, pentyl or neopentyl group; an optionally substituted C2 8alkenyl group such as a propenyl e. g. 2-propenyl or butenyl e. g. 2-

butenyl or 3-butenyl group, an optionally substituted C2-8alkynyl group such as a ethynyl, propynyl e. g. 2-propynyl or butynyl e. g. 2-butynyl or 3- butynyl group, an optionally substituted C3-8cycloalkyl group such as a cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl group; an optionally substituted C3-8heterocycloalkyl group such as a tetrahydrofuanyl e. g. tetrahydrofuran-3-yl, pyrrolidinyl e. g. 1- methylpyrrolidinyl such as 1-methylpyrrolidin-3-yl, piperidinyl e. g. 1- methylpiperidinyl such as 1-methylpiperidin-4-yl, tetrahydropyranyl e. g. tetrahydropyran-4-yl or 2-oxo- [1, 3] dioxol-4-yl e. g. 5-methyl-2-oxo- [1,3] dioxol-4-yl group; an optionally substituted C3-8cycloalkylC1-8alkyl group such as a cyclopentylmethyl, cyclohexylmethyl or cyclohexylethyl group; an optionally substituted C3 gheterocycloalkylC1 galkyl group such as a morpholinyl-N-ethyl, thiomorpholinyl-N-methyl, pyrrolidinyl-N-ethyl, pyrrolidinyl-N-propyl, piperidinyl-N-ethyl, pyrazolidinyl-N-methyl or piperazinyl-N-ethyl group; an optionally substituted C1-6alkyloxyC1-6alkyl group such as a methyloxyethyl or propyloxyethyl group; an optionally substituted hydroxyCl-6alkyl group such as a hydroxyethyl e. g. 2- hydroxyethyl or hydroxypropyl e. g. 2-hydroxypropyl, 3-hydroxypropyl or 2,3-dihydroxypropyl group; an optionally substituted C1 6alkylthioC1 6alkyl group such as an ethylthioethyl group; an optionally substituted C1- 6alkylsulfinylCl-6alkyl group such as an methylsulfinylethyl group; an optionally substituted C1 6alkylsulfonylC1 6alkyl group such as an methylsulfonylmethyl group; an optionally substituted C3-8cycloalkyloxyC1- 6alkyl group such as a cyclohexyloxymethyl group; an optionally substituted C3-8cycloalkylthioCi-6alkyl group such as a cyclopentylthiomethyl group; an optionally substituted 63- <BR> <BR> <BR> <BR> gcycloalkylsulfinylC-6alkyl group such as a cyclopentyl-sulfinylmethyl group; an optionally substituted C3-8cycloalkylsulfonylCl_6alkyl group such as a cyclopentylsulfonylmethyl group; an optionally substituted Cl- 6alkyloxycarbonylC1-6alkyl group such as isobutoxy-carbonylpropyl group;

an optionally substituted C1 6alkyloxycarbonylC1 6alkenyl group such as isobutoxycarbonylpentenyl group; an optionally substituted Ci- 6aikyloxycarbonyloxyc1-6alkyl group such as an ethyloxycarbonyloxymethyl or isopropoxycarbonyloxyethyl e. g 1- (isopropoxycarbonyloxy) ethyl or 2- (isopropoxycarbonyloxy) ethyl group ; an optionally substituted C1-6alkoxycarbonyloxyC1-6alkenyl group such as a isopropoxycarbonyloxybutenyl group, an optionally substituted Cs- gcycloalkyloxycarbonyloxyC-6alkyl group such as a cyclohexyloxy- carbonyloxyethyl, e. g. a 2-(cyclohexyloxycarbonyloxy)ethyl group, an optionally substituted N-di-C1-8alkylaminoC1-8alkyl group such as a N- dimethylaminoethyl or N-diethylaminoethyl group; an optionally substituted N-C6-12aryl-N-C1-6alkylaminoC1-6alkyl group such as a N-phenyl-N- methylaminomethyl group; an optionally substituted N-di-C1 galkyl- carbamoylCl-8alkyl group such as a N-diethylcarbamoylmethyl group; an optionally substituted C6-12arylC1-6alkyl group such as an optionally substituted benzyl, phenylethyl, phenylpropyl, 1-naphthylmethyl or 2- naphthylmethyl group; an optionally substituted heteroC6-10arylC1-6alkyl group, such as a pyridinylmethyl e. g. pyridin-4-ylmethyl or imidazolylethyl e. g. 2-imidazol-1-ylethyl group; a C6-12aryl group such as an optionally substituted phenyl, 1-naphthyl or 2-naphthyl group; a C6-12aryloxyC1- galkyl group such as an optionally substituted phenyloxymethyl, phenyloxyethyl, 1-naphthyloxymethyl, or 2-naphthyloxymethyl group; a Ce- 12arylthioC-galkyl group such as an optionally substituted phenylthioethyl group; a C6-i2arylsulfinylCl_galkyl group such as an optionally substituted phenyl-sulfinylmethyl group; a C6-12arylsulfonylC1-8alkyl group such as an optionally substituted phenylsulfonylmethyl group; an optionally substituted C1-8alkanoyloxyC1-8alkyl group, such as a acetoxymethyl, ethoxycarbonyloxyethyl, pivaloyloxymethyl, propionyloxyethyl or propionyl- oxypropyl group; an optionally substituted C4-8imidoC1-8alkyl group such as a succinimidomethyl or phthalamidoethyl group; a C6-12aroyloxyCl-

8alkyl group such as an optionally substituted benzoyloxyethyl or benzoyloxypropyl group or a triglyceride such as a 2-substituted triglyceride e. g. a 1,3-di-C1 8alkylglycerol-2-yl group such as a 1,3- diheptylglycerol-2-yl group. Optional substituents present on the Alk7 group include R13a substituents described below.

It will be appreciated that in the forgoing list of Alk7 groups the point of attachment to the remainder of the compound of formula (1) is via the last described part of the Alk7 group. Thus, for example a methoxyethyl group would be attached by the ethyl group, whilst a morpholinyl-N-ethyl group would be attached via the N-ethyl group.

It will be further appreciated that in the forgoing list of Alk7 groups, where not specifically mentioned, alkyl groups may be replaced by alkenyl or alkynyl groups where such groups are as previously defined for Alk1.

Additionally these alkyl, alkenyl or alkynyl groups may optionally be interrupted by one, two or three linker atoms or groups where such linker atoms and groups are as previously defined for L3.

Further prodrugs of compounds of formula (1) include cyclic esters where X is a-N (group in which R2 becomes a C16alkyl joining chain, especially a-CH2-or-CH2CH2-chain, which is also connected to the acid group R to form a cyclic ester of formula (1 a):

When present in the group RX, RY and/or RZ in compounds of formula (1) the linker atom or group represented by L1 may be any linker atom or group as described above for the linker atom or group L3. In addition L may also be a-Se-atom.

When Alk1 is present in the group RX, RY and/or Rz in compounds of formula (1) as an optionally substituted aliphatic chain it may be an optionally substituted C1 10aliphatic chain. Particular examples include optionally substituted straight or branched chain C1 6alkylene, C2 6alkenylene or C2-6alkynylene chains.

Particular examples of aliphatic chains represented by Alk1 include optionally substituted-CH2-,- (CH2) 2-,-CH (CH3) CH2-,- (CH2) 2CH2-,- (CH2) 3CH2-,-CH (CH3) (CH2) 2-,-CH2CH (CH3) CH2-, -C(CH3)2CH2-, - CH2C (CH3) 2CH2-,-(CH2) 2C (CH3) 2CH2-,-(CH2) 4CH2-,-(CH2) 5CH2-, <BR> <BR> <BR> <BR> CHCH-,-CHCHCH2-,-CH2CHCH-,-CHCHCH2CH2-,-CH2CHCHCH2-,- (CH2) 2CHCH-,-CC-,-CCCH2-,-CH2CC-,-CCCH2CH2-,-CH2CCCH2-or- (CH2) 2CC- chains.

Heteroaliphatic chains represented by Alk1 when present in the group Rx, RY and/or Rz in compounds of formula (1) include the aliphatic chains just described for Alk1 but with each additionally containing one, two, three or four heteroatoms or heteroatom-containing groups. Particular hetero- atoms or groups include atoms or groups L5 where L5 is as defined above for L3 when L3 is a linker atom or group. Each L5 atom or group may interrupt the aliphatic chain, or may be positioned at its terminal carbon atom to connect the chain to an adjoining atom or group. Particular examples include optionally substituted-CH2L5-,-CH2CH2L5-,-L5CH2-,- L5CH2CH2-,-L5CH (CH3) CH2-,-L5CH2CH (CH3) CH2-, - L5CH2CH2CH (CH3)-,-L5C (CH3) 2CH2-,-CH2L5CH2CH2-,- (CH2) 2L5CH2-,-

(CH2) 3L5CH2-,-L5 (CH2) 3-,-L5 (CH2) 4-,-CH2L5CH2CHL5CH2-and- (CH2) 2L5CH2CH2- chains.

The optional substituents which may be present on aliphatic or heteroaliphatic chains represented by Alk1 include one, two, three or more substituents where each substituent may be the same or different and is selected from halogen atoms, e. g. fluorine, chlorine, bromine or iodine atoms, or-OH,-C02H,-C02R9, where R9 is an optionally substituted straight or branched C1-6alkyl group as defined above for R4,-CONHR9,- CON (R9) 2,-COR9, e. g.-COCH3, C1-6alkoxy, e. g. methoxy or ethoxy, thiol, -S(O) R9,-S (O) 2R9, C1-6alkylthio e. g. methylthio or ethylthio, amino or substituted amino groups. Substituted amino groups include-NHR9 and- N (R9) 2 groups. Where two R9 groups are present in any of the above substituents these may be the same or different.

Optionally substituted cycloaliphatic groups represented by the group R3 when present in the group RX, RY and/or Rz in compounds of the invention include optionally substituted C3-iocycloaliphatic groups. Particular examples include optionally substituted C3 10cycloalkyl, e. g. C3-gcycloalkyl or C3 10cycloalkenyl, e. g C3 gcycloalkenyl groups.

Optionally substituted heterocycloaliphatic groups represented by the group R3 when present in the group RX, RY and/or Rz include optionally substituted C3-loheterocycloaliphatic groups. Particular examples include optionally substituted C3-10heterocycloalkyl, e. g. C3-7heterocycloalkyl, or C3-10heterocycloalkenyl, e. g. C3-7hetercycloalkenyl groups, each of said groups containing one, two, three or four heteroatoms or heteroatom- containing groups L5 as defined above.

Optionally substituted polycycloaliphatic groups represented by the group R3 when present in the group RX, RY and/or RZ include optionally substitued C7 10 bi-or tricycloalkyl or C7 10bi-or tricycloalkenyl groups.

Optionally substituted heteropolycycloaliphatic groups represented by the group R3 include the optionally substituted polycycloaliphatic groups just described, but with each group additionally containing one, two, three or four L5 atoms or groups.

Particular examples of cycloaliphatic, polycycloaliphatic, heterocyclo- aliphatic and heteropolycycloaliphatic groups represented by the group R3 include optionally substituted cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl, 2-cyclobuten-1-yl, 2-cyclopenten-1-yl, 3-cyclopenten-1-yl, adamantyl, norbornyl, norbornenyl, tetrahydrofuranyl, tetrahydrothiophenyl, tetrahydrothiophene-1-oxide, tetrahydrothiophene-1,1-dioxide, pyrroline, e. g. 2-or 3-pyrrolinyl, pyrrolidinyl, pyrrolidinone, oxazolidinyl, oxazolidinone, dioxolanyl, e. g. 1,3- dioxolanyl, imidazolinyl, e. g. 2-imidazolinyl, imidazolidinyl, pyrazolinyl, e. g.

2-pyrazolinyl, pyrazolidinyl, pyranyl, e. g. 2-or 4-pyranyl, tetrahydropyranyl, tetrahydrothiopyranyl, tetrahydrothiopyran-1-oxide, tetrahydrothiopyran-1,1- dioxide, piperidinyl, piperidinone, dioxanyl e. g. 1,3-dioxanyl or 1,4-dioxanyl, morpholinyl, morpholinone, dithianyl, e. g. 1,3-dithianyl or 1,4-dithianyl, thiomorpholinyl, piperazinyl, 1,3,5-trithianyl, oxazinyl, e. g. 2H-1, 3-, 6H-1,3-, 6H-1, 2-, 2H-1, 2- or 4H-1, 4- oxazinyl, 1,2,5-oxathiazinyl, isoxazinyl, e. g. o- or p-isoxazinyl, oxathiazinyl, e. g. 1,2,5 or 1,2,6-oxathiazinyl, or 1,3,5,- oxadiazinyl groups.

The optional substituents which may be present on the cycloaliphatic, polycycloaliphatic, heterocycloaliphatic or heteropolycycloaliphatic groups represented by the group R3 include one, two, three or more substituents each selected from halogen atoms, e. g. fluorine, chlorine, bromine or

iodine atoms, or C1 6alkyl, e. g. methyl, ethyl, propyl or i-propyl, halo1 6alkyl, e. g. halomethyl or haloethyl such as difluoromethyl or trifluoromethyl, optionally substituted by hydroxyl, e. g.-C (OH) (CF3) 2, Ci- 6alkoxy, e. g. methoxy, ethoxy or propoxy, haloCl-6alkoxy, e. g. halomethoxy or haloethoxy such as difluoromethoxy or trifluoromethoxy, thiol, C1 6alkylthio e. g. methylthio, ethylthio or propylthio, or -(Alk4)gR10 groups in which Alk4 is a straight or branched C1 3alkylene chain, g is zero or an integer 1 and Rio is a-OH,-SH,-N (R11) 2, (in which R11 is an atom or group as defined herein for R7) -CN, -CO2R11, -NO2, -CON(R11) 2,- CSN (R11)2, -COR11, -CSN(R11) 2,-N (RH) COR11, -N(R11)CSR11, - S02N (Rl 1)2, -N(R11)SO2R11, -N(R11 CON (R11) 2,-N (R11) CSN (R11), N (R11)SO2N(R11) 2 or optionally substituted phenyl group. Where two Rl 1 atoms or groups are present in these substituents these may be the same or different or joined to form a heterocyclic ring as previously described when R5 and R6 are joined together. Optionally substituted phenyl groups include phenyl substituted by one, two or three of the R13 groups described below.

Additionally, when the group R3 is a heterocycloaliphatic group containing one or more nitrogen atoms each nitrogen atom may be optionally substituted by a group- (L6) p (Alk5) qR12 in which L6 is-C (O)-,-C (O) O-,- C (S)-,-S (O) 2-,-CON (R8)-,-CSN (R8)- or S02N (R8)- ; p is zero or an integer 1; Alk5 is an optionally substituted aliphatic or heteroaliphatic chain; q is zero or an integer 1; and R12 is a hydrogen atom or an optionally substituted cycloaliphatic, heterocycloaliphatic, polycycloaliphatic, polyheterocycloaliphatic, aromatic or heteroaromatic group.

C1 3alkylene chains represented by Alk4 include-CH2-,-CH2CH2-,- CH2CH2CH2-,-CH (CH3) CH2- and-CH2CH (CH3)- chains.

Optionally substituted aliphatic or heteroaliphatic chains represented by Alk5 include those optionally substituted chains described above for Alk1.

Optional substituents which may be present on these groups include those described above in relation to Alk1.

Cycloaliphatic, heterocycloaliphatic, polycycloaliphatic or polyheterocyclo- aliphatic groups represented by R12 include those groups just described for the group R3. Optional substituents which may be present on those groups include those described above in relation to R3 cycloaliphatic groups.

Aromatic or heteroaromatic groups represented by R12 include those groups described herein for the group Arl. Optional substituents which may be present on these groups include those R13 optional substituents described hereinafter.

When the group R3 is an optionally substituted aromatic or heteroaromatic group it may be for example an aromatic or heteroaromatic group as described herein for the group Ar1.

Optional substituents which may be present on the aromatic or heteroaromatic groups represented by the group R3 include one, two, three or more substituents, each selected from an atom or group R13 in which R13 is -R13a or -Alk6(R13a)m, where R13a is a halogen atom, or an amino (-NH2), substituted amino, nitro, cyano, amidino, hydroxyl (-OH), substituted hydroxyl, formyl, carboxyl (-C02H), esterified carboxyl, thiol (- SH), substituted thiol,-COR14 [where R14 is an-Alk6 (R13a)1 m, aryl or <BR> <BR> <BR> heteroaryl group],-CSR1 4,-SO3H,-SOR1 4,-S02R1 4,-So3R14,-S02NH2,<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> - S02NHR14, S02N (R4) 2,-CONH2,-CSNH2,-CONHR14,-CSNHR14,-

CON [R14]2, -CSN(R14)2, -N(R11)SO2R14, -N(SO2R14)2, - NH (R11) S02NH2,-N (R11)SO2NHR14, -N(R11)SO2N(R14)2, -N(R11)COR14, -N(R11) CONH2,-N (R11)CONHR14, -N(R11) CON (Rl4) 2,-N (Rll) CSNH2,- N (R1 CSNHR14,-N (RH) CSN (Rl4) 2,-N (R11)CSR14, -N(R11) C (O) OR14, - S02NHet1 [where-NHet1 is an optionally substituted C5-6cyclicamino group optionally containing one or more other-O-or-S-atoms or-N (R11)- ,-C (O)-,-C (S)-, S (O) or-S (O) 2 groups[, -CONHet1, -CSNHet1, - N(R11)SO2NHet1, -N(R11)CONHet1, -N(R11)CSNHet1, -SO2N(R11)Het2 [where Het2 is an optionally substituted monocyclic C5-7carbocyclic group optionally containing one or more-O-or-S-atoms or-N (R11)-,-C (O)-or- C (S)- groups], -Het2, -CON(R11) Het2,-CSN (R11)Het2, - N (Rll) CON (R11) Het2,-N (RH) CSN (Rii) Het2, aryl or heteroaryl group; Alk6 is a straight or branched C1-6alkylene, C2-6alkenylene or C2- 6alkynylene chain, optionally interrupted by one, two or three -O- or -S- atoms or-S (O) n [where n is an integer 1 or 2] or-N (R15)- groups [where R15 is a hydrogen atom or C1 6alkyl, e. g. methyl or ethyl group]; and m is zero or an integer 1,2 or 3. It will be appreciated that when two Rl 1 or R14 groups are present in one of the above substituents, the R11 or R14 groups may be the same or different.

When in the group -Alk6(R13a)m m is an integer 1,2 or 3, it is to be understood that the substituent or substituents R13a may be present on any suitable carbon atom in-Alk6. Where more than one R13a substituent is present these may be the same or different and may be present on the same or different atom in-Alk6. Clearly, when m is zero and no substituent R13a is present the alkylene, alkenylene or alkynylene chain represented by Alk6 becomes an alkyl, alkenyl or alkynyl group.

When R13a is a substituted amino group it may be for example a group- NHR14 [where R14 is as defined above] or a group-N (R14) 2 wherein each R14 group is the same or different.

When R13a is a halogen atom it may be for example a fluorine, chlorine, bromine, or iodine atom.

When R13a is a substituted hydroxyl or substituted thiol group it may be for example a group-OR14 or a-SR14 or-SC (=NH) NH2 group respectively.

Esterified carboxyl groups represented by the group R13a include groups of formula-C02Alk8 wherein Alk8 is a straight or branched, optionally substituted C1 galkyl group such as a methyl, ethyl, n-propyl, i-propyl, n- butyl, i-butyl, s-butyl or t-butyl group; a C6-12arylC108alkyl group such as an optionally substituted benzyl, phenylethyl, phenylpropyl, 1-naphthylmethyl or 2-naphthylmethyl group; a C6-12aryl group such as an optionally substituted phenyl, 1-naphthyl or 2-naphthyl group; a C6-12arylOXYCl-8alkyl group such as an optionally substituted phenyloxymethyl, phenyloxyethyl, 1-naphthyloxymethyl, or 2-naphthyloxymethyl group; an optionally substituted C1-8alkanoyloxyC1-8alkyl group, such as a pivaloyloxymethyl, propionyloxyethyl or propionyloxypropyl group; or a C6_12aroyloxyCl-galkyl group such as an optionally substituted benzoyloxyethyl or benzoyloxy- propyl group. Optional substituents present on the Alk8 group include R13a substituents described above.

When Alk6 is present in or as a substituent it may be for example a methylene, ethylene, n-propylene, i-propylene, n-butylene, i-butylene, s- butylen, t-butylene, ethenylene, 2-propenylene, 2-butenylene, 3- butenylene, ethynylene, 2-propynylene, 2-butynylene or 3-butynylene chain, optionally interrupted by one, two, or three-O-or-S-, atoms or- S (O)-,-S (O) 2- or-N (R8)- groups.

Aryl or heteroaryl groups represented by the groups R13a or R14 include mono-or bicyclic optionally substituted C6 12aromatic or C1 ghetero- aromatic groups as described above for the group Arl. The aromatic and heteroaromatic groups may be attached to the remainder of the compound of formula (1) by any carbon or hetero e. g. nitrogen atom as appropriate.

When-NHet1 or-Het2 forms part of a substituent R13 each may be for example an optionally substituted pyrrolidinyl, pyrazolidinyl, piperazinyl, morpholinyl, thiomorpholinyl, piperidinyl or thiazolidinyl group. Additionally Het2 may represent for example, an optionally substituted cyclopentyl or cyclohexyl group. Optional substituents which may be present on-NHet1 or-Het2 include those optional substituents described above in relation to aliphatic chains represented by Alkyl.

Particularly useful atoms or groups represented by R13 include fluorine, chlorine, bromine or iodine atoms, or C1-galkyl, e. g. methyl, ethyl, n-propyl, i-propyl, n-butyl or t-butyl, optionally substituted phenyl, pyridyl, pyrimidinyl, <BR> <BR> <BR> pyrrolyl, furyl, thiazolyl, thienyl, morpholinyl, thiomorpholinyl, piperazinyl, e. g. t-butyloxycarbonylpiperazinyl, pyrrolidinyl, dioxolanyl, dioxanyl, oxazolidinyl, thiazolidinyl, imidazolidinyl or piperidinyl, C1-6hydroxyalkyl, e. g. hydroxymethyl or hydroxyethyl, carboxyC1-6alkyl, e. g. carboxyethyl, C1-6alkylthio e. g. methylthio or ethylthio, carboxyC-6alkylthio, e. g. carboxymethylthio, 2-carboxyethylthio or 3-carboxypropylthio, C1-6alkoxy, e. g. methoxy or ethoxy, hydroxyCl-6alkoxy, e. g. 2-hydroxyethoxy, optionally substituted phenoxy, pyridyloxy, thiazolyoxy, phenylthio or pyridylthio, C4_7cycloalkyl, e. g. cyclobutyl, cyclopentyl, C5-7cycloalkoxy, e. g. cyclopentyloxy, haloC-6alkyl, e. g. trifluoromethyl, haloC1 6alkoxy, e. g. trifluoromethoxy, C1_6alkylamino, e. g. methylamino, ethylamino or propylamino, C6-12arylC1-6alkylamino, e. g. benzylamino, 4-fluorobenzyl-

amino or 4-hydroxyphenylethylamino, amino (-NH2), aminoC1-6alkyl, e. g. aminomethyl or aminoethyl, C1-6dialkylamino, e. g. dimethylamino or diethylamino, aminoC1-6alkylamino, e. g. aminoethylamino or amino- propylamino, optionally substituted Het1NC1-6alkylamino, e. g. 3-morpho- linopropylamino, C1 6alkylaminoC1 6alkyl, e. g. ethylaminoethyl, Cul- 6dialkylaminoC1-6alkyl, e. g. diethylaminoethyl, aminoCl-6alkoxy, e. g. aminoethoxy, Ci-6alkylaminoCl-6alkoxy, e. g. methylaminoethoxy, Ci- 6dialkylaminoCl-6alkoxy, e. g. dimethylaminoethoxy, diethylaminoethoxy, diisopropylaminoethoxy, or dimethylaminopropoxy, hydroxyCl-6alkylamino, e. g. 2-hydroxyethylamino, 3-hydroxypropylamino or 3-hydroxybutylamino, imido, such as phthalimido or naphthalimido, e. g. 1,8-naphthalimido, nitro, cyano, amidino, hydroxyl (-OH), formyl [HC (O)-], carboxyl (-C02H),- C02Alk8 [where Alk3 is as defined above], C1-6alkanoyl e. g. acetyl, propyryl or butyryl, optionally substituted benzoyl, thiol (-SH), thioC1-6alkyl, e. g. thiomethyl or thioethyl,-SC (=NH) NH2, sulphonyl (-SO3H),-SO3Alk8, C-6alkylsulphinyl, e. g. methylsulphinyl, ethylsulphinyl or propylsulphinyl, C106alkylsulphonyl, e. g. methylsulphonyl, ethylsulphonyl or propyl- sulphonyl, aminosulphonyl (-OS2NH2), C1-6alkylaminosulphonyl, e. g. methylaminosulphonyl, ethylaminosulphonyl or propylaminosulphonyl C1 6dialkylaminosulphonyl, e. g. dimethylaminosulphonyl or diethylamino- sulphonyl, phenylaminosulphonyl, carboxamido (-CONH2), C1-6alkylamino- carbonyl, e. g. methylaminocarbonyl, ethylaminocarbonyl or propylamino- carbonyl, C1-6dialkylaminocarbonyl, e. g. dimethylaminocarbonyl or diethylaminocarbonyl, aminoCl-6alkylaminocarbonyl, e. g. aminoethyl- aminocarbonyl, C1 6alkylaminoC1 6alkylaminocarbonyl, e. g. methylamino- ethylaminocarbonyl, C1 6dialkylaminoCi-6alkylaminocarbonyl, e. g. diethyl- aminoethylaminocarbonyl, aminocarbonylamino, C1-6alkylaminocarbonyl- amino, e. g. methylaminocarbonylamino or ethylaminocarbonylamino, Cl- 6dialkylaminocarbonylamino, e. g. dimethylaminocarbonylamino or diethyl- aminocarbonylamino, C1 6alkylaminocabonylC1 6alkylamino, e. g. methyl-

aminocarbonylmethylamino, aminothiocarbonylamino, C1 6alkylaminothio- carbonylamino, e. g. methylaminothiocarbonylamino or ethylaminothio- carbonylamino, C1-6dialkylaminothiocarbonylamino, e. g. dimethylamino- thiocarbonylamino or diethylaminothiocarbonylamino, C1-6alkylaminothio- carbonylCl-6alkylamino, e. g. ethylaminothiocarbonylmethylamino,- CONHC (=NH) NH2, C1-6alkylsulphonylamino, e. g. methylsulphonylamino or ethylsulphonylamino, haloCl-6alkylsulphonylamino, e. g. trifluoromethyl- sulphonylamino, C-6dialkylsulphonylamino, e. g. dimethylsulphonylamino or diethylsulphonylamino, optionally substituted phenylsulphonylamino, aminosulphonylamino (-NHS02NH2), C1-6alkylaminosulphonylamino, e. g. methylaminosulphonylamino or ethylaminosulphonylamino, C1-6dialkyl- aminosulphonylamino, e. g. dimethylaminosulphonylamino or diethylamino- sulphonylamino, optionally substituted morpholinesulphonylamino or morpholinesulphonylC-6alkylamino, optionally substituted phenylamino- sulphonylamino, C1-6alkanoylamino, e. g. acetylamino, aminoCl-6alkanoyl- amino e. g. aminoacetylamino, C1-6dialkylaminoC1-6alkanoylamino, e. g. dimethylaminoacetylamino, Ci _6alkanoylaminoC-6alkyl, e. g. acetylamino- methyl, C1-6alkanoylaminoC1-6alkylamino, e. g. acetamidoethylamino, Cl- 6alkoxycarbonylamino, e. g. methoxycarbonylamino, ethoxycarbonylamino or t-butoxycarbonylamino or optionally substituted benzyloxy, pyridylmethoxy, thiazolylmethoxy, benzyloxycarbonylamino, benzyloxy- carbonylaminoC1 6alkyl e. g. benzyloxycarbonylaminoethyl, thiobenzyl, pyridylmethylthio or thiazolylmethylthio groups.

Where desired, two R13 substituents may be linked together to form a cyclic group such as a cyclic ether, e. g. a C1-6alkylenedioxy group such as methylenedioxy or ethylenedioxy.

It will be appreciated that where two or more R13 substituents are present, these need not necessarily be the same atoms and/or groups. In general,

the substituent (s) may be present at any available ring position in the aromatic or heteroaromatic group represented by R3.

When the groups Rx and RY are joined together to form an optionally substituted spiro linked cycloaliphatic or heterocycloaliphatic group joined to the cyclobutenone ring as defined by formula (1) it may be any such cycloaliphatic or heterocycloaliphatic group as previously described for R3.

Optional substituents which may be present on such spiro linked cycloaliphatic or heteroaliphatic groups include those optional substituents as described in relation to R3.

The presence of certain substituents in the compounds of formula (1) may enable salts of the compounds to be formed. Suitable salts include pharmaceutical acceptable salts, for example acid addition salts derived from inorganic or organic acids, and salts derived from inorganic and organic bases.

Acid addition salts include hydrochlorides, hydrobromides, hydroiodides, alkylsulphonates, e. g. methanesulphonates, ethanesulphonates, or isothionates, arylsulphonates, e. g. p-toluenesulphonates, besylates or napsylates, phosphates, sulphates, hydrogen sulphates, acetates, trifluoroacetates, propionates, citrates, maleates, fumarates, malonate, succinates, lactates, oxalates, tartrates and benzoates.

Salts derived from inorganic or organic bases include alkali metal salts such as sodium or potassium salts, alkaline earth metal salts such as magnesium or calcium salts, and organic amine salts such as morpholine, piperidine, dimethylamine or diethylamine salts.

Particularly useful salts of compounds according to the invention include pharmaceutical acceptable salts, especially acid addition pharma- ceutically acceptable salts.

In the compounds according to the invention the group R1 is preferably an Ar1 L2Ar2Alk-group. In compounds of this type Ar1 is preferably an optionally substituted phenyl, monocyclic heteroaromatic or bicyclic heteroaromatic group. Particularly useful monocyclic heteroaromatic groups are optionally substituted five-or six-membered heteroaromatic groups as described previously, especially five-or six-membered heteroaromatic groups containing one or two heteroatoms selected from oxygen, sulphur or nitrogen atoms. Nitrogen-containing groups are especially useful, particularly pyridyl or pyrimidinyl groups. Particularly useful substituents present on these monocyclic Ar1 groups include halogen atoms or alkyl, haloalkyl,-OR5,-SR5,-NR5R6,-C02H,-C02CH3, - N02,-N (R5) COR6 or-CN groups as described above in relation to the compounds of formula (1). Particularly useful bicyclic heteroaromatic groups represented by Ar1 include optionally substituted ten-membered fused-ring heteroaromatic groups containing one, two or three, especially one or two heteroatoms, especially nitrogen atoms. Particular examples include optionally substituted naphthyridinyl, especially 2,6-naphthyridinyl, 2,7-naphthyridinyl, quinolinyl and isoquinolinyl, especially isoquinolin-1-yl groups. Particular optional substituents include those just described for monocyclic heteroaromatic groups. Additionally, in compounds according to the invention X is preferably an-N (R2)- group and V is preferably an oxygen atom.

A particularly useful group of compounds according to the invention has the formula (2a):

wherein-W= is-CR'8=,-N= or-N (O) = ; R16, R17 and R18, which may be the same or different is each a hydrogen atom or an atom or group-L3 (Alk2) tL4 (R4) u in which L3, Alk2, t, L4, R4 and u are as defined previously ; L2, Ar2, Alk, R2, Rx, RY and Rz are as defined for formula (1); and the salts, solvates, hydrates and N-oxides thereof.

In one preferred class of compounds of formula (2a) where W is a-CR18= group R18 is a hydrogen atom. In another preferred class of compounds R18 is a preferred atom or group as hereinafter defined for R16, especially a C1 6alkoxy, especially a methoxy or ethoxy, group.

In another preferred class of compounds of formula (2a) W is a-N= or- N (O) = group.

R16 and R17 in compounds of formula (2a) is each preferably as particularly described above for compounds of formula (1), other than a hydrogen atom. Particularly useful R16 and R17 substituents include halogen atoms, especially fluorine or chlorine atoms, or C1-6alkyl, especially methyl, ethyl or isopropyl, haloC1 6alkyl especially halomethyl, most especially-CF3,-CHF2 or-CH2F, C1-6alkoxy especially methoxy or etoxy or haloC-6alkoxy especially halomethoxy, most especially-OCF3,- OCHF2 or-OCH2F groups. A further particularly useful group of compounds according to the invention has the formula (2b):

wherein g is the integer 1,2,3 or 4; R16, is an atom or group-L3 (Alk2) tL4 (R4) u in which L3, Alk2, t, L4, R4 and u are as defined previously; L2, Ar2, Alk, R2, RX, RY and Rz are as defined for formula (1); and the salts, solvates, hydrates and N-oxides thereof.

Particularly useful R16 substituents when present in compounds of formula (2b) include halogen atoms, especially fluorine, chlorine or bromine atoms, or C1 6alkyl e. g. methyl, ethyl or isopropyl, haloC1 6alkyl, especially halomethyl, most especially-CF3, Cl-6alkoxyl, especially methoxy, haloC1 6alkoxy, especially halomethoxy, most especially-OCF3,-CN,- C02CH3,-N02, amino (-NH2), substituted amino (-NR5R6) especially- NHCH3 and-N (CH3) 2,-N (R5) COCH3, especially-NHCOCH3 groups or optionally substituted phenyl, furyl, thienyl, imidazolyl, pyridyl and pyrimidinyl groups.

A further particularly useful group of compounds according to the invention has the formula (2c):

wherein R16, g, L2, Ar2, Alk, R2, Rx, RY and Rz are as defined for formula (2b); and the salts, solvates, hydrates and N-oxides thereof.

Each R16 atom or group in compounds of formula (2c) may be independently selected from an atom or group-L3 (Alk2) nL4 (R4) u as previously particularly defined for compounds of formula (2b).

A further particularly useful group of compounds according to the invention has the formula (2d):

wherein R16, g, L2, Ar2, Alk, R2, Rx, Ry and Rz are as defined for formula (2b) : and the salts, solvates, hydrates and N-oxides thereof.

Each R16 atom or group in compounds of formula (2d) may be independently selected from an atom or group-L3 (Alk2) tL4 (R4) U as previously defined for compounds of formula (2b).

In one preferred class of compounds of formula (2d) at least one R16 atom or group is present at the 3-position of the isoquinoline ring. In a preferred group of compounds of this class R16 is an optionally substituted phenyl ring. Optional substituents which may be present on the phenyl ring include halogen atoms, especially fluorine or chlorine atoms, or C1 6alkyl, especially methyl, ethyl or isopropyl, haloC-6alkyl especially halomethyl, most especially-CF3,-CHF2 or-CH2F, C1 6alkoxy especially methoxy or etoxy or ha 6alkoxy especially halomethoxy, most especially-OCF3,- OCHF2 or-OCH2F groups.

It will be understood that compounds according to formulae (2a), (2b), (2c) and (2d) include, where applicable, the corresponding hydroxy tautomers.

Alk in compounds of the invention is preferably: or, especially,-CH2CH (R)-.

In one preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) R is a-C02H group.

In another prefered class of compounds of formulae formulae (1), (2a), (2b), (2c) and (2d) R is an esterified carboxyl group of formula-CO2Alk7 which may advantageously be used as a prodrug of the active compound. In this class of compound Alk7 is preferably a C1 galkyl group, especially a methyl, ethyl, propyl, i-propyl, butyl, t-butyl, pentyl or neopenyl group; an optionally substituted C3 8cycloalkyl group, especially a cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl group; an optionally

substituted C3-8heterocycloalkyl group especially a tetrahydrofuanyl e. g. tetrahydrofuran-3-yl, pyrrolidinyl e. g. 1-methylpyrrolidinyl such as 1- methylpyrrolidin-3-yl, piperidinyl e. g. 1-methylpiperidinyl such as 1- methylpiperidin-4-yl, tetrahydropyranyl e. g. tetrahydropyran-4-yl or 2-oxo- [1,3] dioxol-4-yl e. g. 5-methyl-2-oxo- [1, 3] dioxol-4-yl group; an optionally substituted C6 1oaryl group, especially a phenyl group; an optionally substituted C6 10arylC1 6alkyl group, especially a benzyl group; an optionally substituted heteroC6-10arylC1-6alkyl group, especially a pyridinylC1 3alkyl group such as pyridinylmethyl e. g. pyridin-4-ylmethyl or pyridinylethyl e. g. pyridine-4-ylethyl or a imidazolylC1-3alkyl group such as imidazolylethyl e. g. 2-imidazol-1-ylethyl or imidazolylpropyl e. g. 2-imidazol- 1-ylpropyl group; an optionally substituted hydroxyCl-6alkyl group, especially a hydroxyethyl e. g. 2-hydroxyethyl or hydroxypropyl e. g. 3- hydroxypropyl or 2,3-dihydroxypropyl group; an optionally substituted Cs- 8heterocycloalkylC1-6alkyl group, especially a morpholinyl-N-ethyl group; an optionally substituted N-di-C-8alkylaminoCl-galkyl group, especially a N-dimethylaminoethyl or N-diethylaminoethyl group; or an optionally substituted C1-6alkyloxyC1-6alkyl group, especially a methyloxyethyl group. Especially preferred esterified carboxyl groups include-C02CH3,- C02CH2CH3,-C02CH2CH2CH3,-C02CH (CH3) 2 and-C02C (CH3) 3 groups. A most especially preferred esterified carboxyl group is- C02 (hydroxyC1-6alkyl), especially -CO2CH2CH2OH.

In general in compounds of formula (1) when X is a-N (R2) group and in particular in compounds of formulae (2a), (2b), (2c) and (2d) R2 is preferably a hydrogen atom.

In one preferred class of compounds of formula (2a) L2 is preferably L2a where L2a is a-CON (R8)- group [where R8 is preferably a hydrogen atom or a C1-3alkyl group], especially a-CONH-group or a -(Alk3)L2a- group,

especially a- (Alk3) 0- group [where Alk3 is preferably a C1-3alkyl group], most especially a-CH20-group. In this class of compounds-W= is preferably-N= or-N (O) =. Most preferably W is-N=.

In another preferred class of compounds of formula (2a) 2 is preferably a covalent bond. In this class of compounds-W= is preferably-C (R18) =, where R18 is as hereinbefore generally and particularly defined.

In general in compounds of formulae (2b), (2c) and (2d) L2 is preferably L2a where L2a is an-O-atom or-N (R8)- group [where R8 is preferably a hydrogen atom or a C1 3alkyl group]. An especially useful-N (R8)- group is -NH-.

The group Ar2 in compounds of formulae (1), (2a), (2b), (2c) and (2d) is preferably an optionally substituted phenylen or optionally substituted pyridinediyl group or formula : where a and b signify the points of attachment of L2 and Alk respectively.

Most preferably Ar2 is an optionally substituted 1,4-phenylene group.

Particularly preferred optional substituents which may be present on Ar2 in compounds of the invention include halogen atoms, especialy fluorine, chlorine or bromine atoms, or C1-6alkyl e. g. methyl, ethyl or i-propyl, haloCl-6alkyl especially halomethyl, most especialy-CF3, C1 6alkoxy especially methoxy or haloC1 6alkoxy, especially halomethoxy, most especially-OCF3,-CN,-C02CH3,-N02, amino (-NH2), substituted amino

(NR5R6) especially-NHCH3 and-N (CH3) 2 and-N (R5) COCH3, especially- NHCOCH3 groups.

In one generally preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) RX, RY and/or Rz is an optionally substituted alkyl group, most preferably an optionally substituted C1 alkyl group such as a methyl, ethyl, n-propyl, i-propyl, n-butyl, n-heptyl, or n-hexyl group.

Particularly preferred optional substituents which may be present on such RX, RY and/or Rz alkyl groups include halogen atoms, especially fluorine or chlorine atoms, C1 6alkoxy groups, especially methoxy, haloC1 6alkoxy groups, especially-OCF3,-CN,-C02CH3,-N02, substituted amino (- NR5R6) especially-NHCH3 and-N (CH3) 2 and optionally substituted phenyl groups where the optional substituents are as herein defined for optional substituents on Ar2.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rz is a hydrogen atom.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx is a hydrogen atom.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rz is a halogen atom, especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rz is a group-L1 (Alk1) nR3. In this class of compounds U is preferably a covalent bond or an-O-,-S-or-Se-atom or-S (O)- or-N (R8)-, especially-NH-or-N (CH3)- group. Most preferably Li is a-S-atom or- S (O)- group. In this class of compounds R3 is preferably a hydrogen atom or an optionally substituted C3-10cycloaliphatic, especially C37cycloalkyl

group, most especially an optionally substituted cyclopentyl, cyclohexyl or cycloheptyl group; or an optionally substituted C310heterocycloaliphatic, especially C3-7heterocycloalkyl group, most especially an optionally substituted piperidinyl, piperazinyl, pyrrolidinyl, imidazolidinyl, dithianyl or pyrazolidinyl group, or an optionally substituted C6 12aromatic group, preferably an optionally substituted phenyl group or an optionally substituted C1 gheteroaromatic group, preferably an optionally substituted monocyclic C1 sheteroaromatic group, most preferably a 5-or 6- membered monocyclic heteroaromatic group containing one, two, three or four heteroatoms selected from oxygen, sulphur or nitrogen atoms, especially an optionally substituted furyl, thienyl, imidazolyl e. g. 1- methylimidazol-2-yl, triazolyl, tetrazolyl, pyridyl, pyrimidinyl or pyrazinyl group. Optional substituents which may be present on such heterocycloaliphatic groups include those substituents as described hereinafter when Rx and Ry are joined to form an optionally substituted spiro linked heterocycloaliphatic group. Optional substituents which may be present on such aromatic and heteroaromatic groups include those substituents as described hereinbefore in relation to R16 substituents in compounds of formula (2a). In one preferred group of compounds of this class n is zero. In another preferred group of compounds of this class L1 is a covalent bond and n is zero. In this group of compounds R3 is preferrably an optionally substituted C310cycloaliphatic, C3- joheterocycloaliphatic, C6-12aromatic or monocyclic C1 gheteroaromatic group as just described. In a further preferred group of compounds of this class n is the integer 1 and Alk1 is preferably an optionally substituted aliphatic chain, most preferably an optionally substituted C1 6alkylene chain, especially a-CH2-,-CH2CH2-or-CH2CH (CH3)- chain. In a further preferred group of compounds of this class L'is a covalent bond, n is the integer 1 and Alk1 is preferably an optionally substituted aliphatic chain, most preferably an optionally substituted C1 6alkylene chain, especially a- CH2-,-CH2CH2-,-CH2CH2CH2-or-CH2CH (CH3)- chain. In a further

preferred group of compounds of this class L'is a preferred atom or group as just described, most especially a-S-atom, n is the integer 1 and Alk1 is preferably an optionally substituted aliphatic chain, most preferably an optionally substituted C1-6alkylene chain, especially a-CH2-,-CH2CH2-,- CH2CH2CH2-or-CH2CH (CH3)- chain. In this class of compounds R3 is preferably a hydrogen atom.

Most especially useful Rz groups which may be present in compounds of the invention include a hydrogen or halogen atom, especially fluorine, chlorine, bomine or iodine atom or a group of formula-L1 (Alk1) nR3 as just defined, especially an alkyl group as previously described or a hydroxyl (- OH); d-eaikoxymethoxy, ethoxy or i-propoxy; C37cycloalkyl, especially cyclopentyl or cyclohexyl ; C1-6alkylsulfanyl, especially methyl- ethyl- or i- propylsulfanyl ; C-6alkylsulfinyl, especially methyl-ethyl-or i-propylsulfinyl ; C37heterocycloalkyl, especially piperidinyl most especially piperidin-3-yl such as 1-methylpiperidin-3-yl or dithianyl especially [1,3] dithian-2-yl ; C6- 12arylselenenyl, especially phenylselenenyl ; C6, 2arylsulfanyl, especially phenylsulfanyl or pentafluorophenylsulfanyl ; monocyclic gheteroaromaticsulfanyl, especially tetrazol-5-ylsulfanyl most especially 1- methyl-1H-terazol-5-ylsulfanyl or imidazolylsulfanyl especially imidazol-2- ylsulfanyl most especially 1-methyl-1 H-imidazol-2-ylsulfanyl ; monocyclic C1-9heteroaromatic, especially pyridinyl most especially pyridin-3-yl, 1- methylpyridinium or pyrazinyl especially pyrazin-2-yl ; or a C6, 2aryle 3alkyl, especially benzyl group.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and Rz is each a hydrogen atom.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx is a hydrogen atom and Rz is a halogen atom, especially a

fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom, or Rz is a group ~L1 (Alk1) nR3 as just described.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and Ry is each a hydrogen atom and RZ is a halogen atom, especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom, or RZ is a group-L1 (Alk1) nR3 as just described.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx is a hydrogen atom and RY is an optionally substituted alkyl group as just described for generally preferred alkyl groups.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and Rz is each a hydrogen atom and RY is an optionally substituted alkyl group as just described.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx is a hydrogen atom, Rz is a halogen atom, especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom or Rz is a group-L1 (Alk1) nR3, especially a group as just particularly described, and RY is an optionally substituted alkyl group as just described for generally preferred alkyl groups.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx is a hydrogen atom and RY and RZ is each an optionally substituted alkyl group as just described for generally preferred alkyl groups.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and RY is each an optionally substituted alkyl group as just described for generally preferred alkyl groups.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and RY is each an optionally substituted alkyl group as just described for generally preferred alkyl groups and Rz is a hydrogen atom.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and RY is each an optionally substituted alkyl group as just described for generally preferred alkyl groups and Rz is a halogen atom, especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom, or RZ is a group-L1 (Alk1) nR3 as just described.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) RX, RY and Rz is each an optionally substituted alkyl group as just described for generally preferred alkyl groups.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and RY are joined to form an optionally substituted spiro linked cycloaliphatic group particularly a C3-locycloaliphatic group, most particularly a C3-8cycloalkyl group, especially an optionally substituted cyclopentyl cyclohexyl, cycloheptyl or cyclooctyl group, or a 63- 8cycloalkenyl group, especially an optionally substituted cyclopentenyl, cyclohexenyl, cycloheptenyl or cyclooctenyl group group. Particularly preferred optional substituents which may be present on such spiro linked cycloaliphatic groups include halogen atoms, especially fluorine or chlorine atoms, C1 6alkyl groups, especially methyl, ethyl, propyl or i- propyl, C1 6alkoxy groups, especially methoxy or ethoxy, haloC1 6alkoxy groups, especially-OCF3,-CN,-C02CH3,-N02 and substituted amino (- N (R11) 2), especially-NHCH3 and-N (CH3) 2 groups. In a preferred group of compounds of this class RZ is a hydrogen atom. In another preferred group of compounds of this class Rz is an alkyl group as just described. In a further preferred group of compounds of this class RZ is a halogen atom,

especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom, particularly a bromine atom. In a still further preferred group of compounds of this class Rz is a group-L1 (Alk1) nR3 as just described.

In another preferred class of compounds of formulae (1), (2a), (2b), (2c) and (2d) Rx and RY are joined to form an optionally substituted spiro linked heterocycloaliphatic group, particularly an optionally substituted 63- joheterocycloaliphatic group, most particularly an optionally substituted C3-7heterocycloalkyl group, especially an optionally substituted C3- 7heterocycloalkyl group containing one or two-O-,-S-,-S (O)-,-S (O) 2-,- NH-or-C (O)- heteroatoms or heteroatom-containing groups. Especially preferred optionally substituted heterocycloaliphatic groups include optionally substituted 5-and 6-membered heterocycloalkyl groups containing one heteroatom or heteroatom-containing group as just described, especially optionally substituted pyrrolidinyl, tetrahydrofuranyl, tetrahydrothiophenyl, tetrahydrothiophene-1-oxide, tetrahydrothiophene- 1,1-dioxide, piperidinyl, tetrahydropyranyl, tetrahydrothiopyranyl tetra- hydrothiopyran-1-oxide or tetrahydrothiopyran-1, 1-dioxide groups.

Particularly preferred optional substituents which may be present on such spiro linked heterocycloaliphatic groups include halogen atoms, especially fluorine or chlorine atoms, C1-6alkyl groups, especially methyl, ethyl, propyl or i-propyl, C1 6alkoxy groups, especially methoxy or ethoxy, haloCl-6alkoxy groups, especially-OCF3,-CN,-C02CH3,-N02 and substituted amino (-N (Rii) 2), especially-NHCH3 and-N (CH3) 2 groups. In addition when the spiro linked heterocycloaliphatic group contains a nitrogen atom this may be substituted by a group- (L6) p (Alk5) qR12 where L6 is preferably-C (O)-or-S (O) 2-, Alk5 is preferably an optionally substituted C1 6alkylene chain, especially a-CH2-,- (CH2) 2- or- CH (CH3) CH2- chain or an optionally substituted heteroC1 6alkylene chain, especially-CH2L5-,-CH2CH2L5-,-L5CH2-or-L5CH2CH2 chain where L5 is

an -O- or -S- atom or-NH or-N (CH3)- group and R12 is a hydrogen atom or an optionally substituted phenyl ring where preferred optional substituents include those atoms and groups as defined hereinbefore for R16 in relation to formula (2b). In one preferred group of compounds of this class RZ is a hydrogen atom. In another preferred group of compounds of this class Rz is an alkyl group as just described. In a further preferred group of compounds of this class Rz is a halogen atom, especially a fluorine, chlorine, bromine or iodine atom, most especially a chlorine or bromine atom. In a still further preferred group of compounds of this class Rz is a group-L1 (Alk1) nR3 as just described.

Particularly useful compounds of the invention include : (2S)-2- [ (3-Oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (3-Oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3- methyl [2,7] naphthyridin-1-yl) oxy] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-4, 4-dimethyl-3-oxo-1-cyclobutenyl) amino]-3- (4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (2, 7) naphthyridin-1-yloxy]phenyl}propanoic acid (2S)-2-[(2-Bromo-3-oxo-7-oxaspiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxopiro[3.5]non-1-en-1-yl)amino}-3-(2, 6- dimethoxy [1,1'-biphenyl]-4-yl) propanoic acid (2S)-2- [ (3-Oxospiro [3.6] dec-1-en-1-yl) amino] 3- {4- [ (3, 5-dichloroiso- nicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-3-oxospiro [3.6] dec-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-{[4,4-Dimethyl-2-(phenylselenenyl)-3-oxo-1-cyclobuten yl]

amino}-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-7-methoxy-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-{(2-B romo-3-oxospi ro [3.5] non-1-en-1-yl) amino}-3- {4- [ (3- methyl [2.7] naphthyridin-1-yl) oxy] phenyl} propanoic acid <BR> <BR> <BR> <BR> (2S)-2-{[2-(Phenylsulfanyl)-4, 4-dimethyl-3-oxo-1-cyclobutenyl]-<BR> <BR> <BR> <BR> <BR> <BR> <BR> amino}-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Chloro-3-oxospiro [3.5] non-1-en-1-yl)amino]-3-{4-[(3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(3-oxo -2-pyridin-3-yl- spiro [3.5] non-1-en-1-ylamino)-propanoic acid (2S)-2-[(2-lodo-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxospiro [3.5] non-1-en-1-yl)amino]-3-{5-[(3, 5- dichloroisonicotinoyl) amino] pyridin-2-yl}propanoic acid (2S)-2-[(2-Chloro-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {5- [ (3, 5- dichloroisonicotinoyl) amino] pyridin-2-yl}propanoic acid (2S)-2-[(2-Chloro-3-oxo-7-oxa-spiro[3. 5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Chloro-3-oxo-spiro[3. 6] dec-1-en-1-yl)amino}-3-{4-[(3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [4, 4-Dimethyl-2- (1-methyl-1 H-tetrazol-5-ylsulfanyl)-3-oxo-cyclobut- 1-enylamino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3, 7,7-trioxo-7X6-thia-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Chloro-3-oxo-spiro [3.4] oct-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloro- isonicotinoyl') amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxo-spiro [3.4] oct-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Methylsulfanyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid

(2S)-2-(2-Fluoro-3-oxo-spiro [3.5] non-1-en-1-ylamino) 3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl}propanoic acid (2S)-2-[(2-Fluoro-3-oxo-7-oxa-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid <BR> <BR> <BR> <BR> (2S)-2- [ (4, 4-Dimethyl-2-methylsulfanyl-3-oxo-cyclobut-1-enyl) amino]-3- {4- [ (3, 5-dicloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Isopropylsulfanyl-4, 4-dimethyl-3-oxo-cyclobut-1-enyl) amino]-3- {4-[(3,5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Isopropylsu Ifanyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-lsopropylsulfanyl-4,4-dimethyl-3-oxo-cyclobut-1-e nyl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2- [ (2-Isopropylsu Ifanyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2- [ (2-Isopropylsu Ifanyl-3-oxo-7-oxa-spiro [3.5] non-1-en-1-yl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2- [ (2-Bromo-3-oxo-spiro [3.4] octa-1,6-dien-1-yl) amino]-3- {4- [ (3,5- dichloroisonicotinoyl) amino] phenyl} propanoic acid <BR> <BR> <BR> <BR> (2S)-2- [ (4, 4-Dimethyl-3-oxo-2-pentafluorophenylsulfanyl-cyclobut-1-< BR> <BR> <BR> <BR> <BR> <BR> enyl) amino]-3-{4-[(3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (4, 4-Dimethyl-3-oxo-2-pyrazin-2-yl-cyclobut-1-enyl) amino]- 3- {4 [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (7-Acetyl-2-bromo-3-oxo-7-aza-spiro [3.5] non-1-en-1-yl) amino]-3- {4-[(3,5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-{[2-(lsopropylsulfanyl)-3-oxo-7-oxaspiro [3.5] non-1-en-yl)] amino}-3- (2,6-dimethoxy [1, 1'-biphenyl]-4-yl) propanoic acid (2S)-2-[(2-Cyclohexyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-3-{4-[(3,5-Dichloroisonicotinoyl) amino] phenyl}-2- (2-methyl-3-oxo- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(3-oxo -2-propyl- spiro [3.5] non-1-en-1-ylamino) propanoic acid

(2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-met hyl-3-oxo-7- oxa-spiro [3.5] non-1-en-1-ylamino) propanoic acid <BR> <BR> <BR> <BR> (2S)-3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl}-2- (3-oxo-2-propyl-7- oxa-spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl}-2- (2- [1, 3] dithian-2-yl-3- oxo-spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl)-2- (2-ethyl-3-oxo- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3- {4- [ (3, 5-Dichloro-1-oxy-pyridine-4-carbonyl) amino] phenyl}-2- (3-oxo- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-2-(2-Bromo-3-oxo-spiro[3. 5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloro- 1-oxy-pyridine-4-carbonyl) amino] phenyl} propanoic acid (2S)-2-(2-Chloro-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloro- 1-oxy-pyridine-4-carbonyl) amino] phenyl} propanoic acid (2S)-3- {4- [ (3, 5-Dichloro-1-oxy-pyridine-4-carbonyl)-amino]-phenyl}-2- (2- methanesulfinyl-4, 4-dimethyl-3-oxo-cyclobut-1-enylamino)-propanoic acid (2S)-2- (2-Bromo-3-oxo-spiro [3. 5] non-1-en-1-ylamino)-3- [4- (3-methyl- [2,7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2- (2-Bromo-3-oxo-spiro [3. 5] non-1-en-1-ylamino)-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid <BR> <BR> <BR> <BR> (2S)-2- (2-Bromo-4, 4-dimethyl-3-oxo-cyclobut-1-enylamino)-3- [4- (3-methyl- [2,7] naphthyridin-1-yloxy) phenyl] propanoic acid (2S)-2-[(2-Bromo-3-oxo-spiro [3.4] oct-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid and the salts, solvates, hydrates, N-oxides and carboxylic acid esters thereof.

Particularly useful carboxylic acid esters thereof include the methyl, ethyl, propy, i-propyl and t-butyl esters.

Most especially useful compounds of the invention include :

(2S)-2-[(2-Bromo-3-oxospiro[3. 5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl}propanoic acid (2S)-2-[(2-Bromo-3-oxo-7-oxaspiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-3-oxospiro [3.6] dec-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxospiro [3.5] non-1-en-1-yl) amino}-3- (4- [ (3- methyl [2,7] naphthyridin-1-yl) oxy] phenyl}propanoic acid (2S)-2- { [2- (Phenylsulfanyl)-4, 4-dimethyl-3-oxo-1-cyclobutenyl]- amino}-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Chloro-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl}-2-(3-oxo-2-pyridin-3-yl- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2 S)-2-[(2-lodo-3-oxospiro [3.5] non-1-en-1-yl)amino]-3-{4-[(3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Bromo-3-oxopiro[3. 5] non-1-en-1-yl) amino]-3- {5- [ (3, 5- dichloroisonicotinoyl)amino]pyridin-2-yl} propanoic acid (2S)-2-[(2-Chloro-3-oxospiro [3.5] non-1-en-1-yl) amino]-3- {5- [ (3, 5- dichloroisonicotinoyl) amino] pyridin-2-yl} propanoic acid (2S)-2-[(2-Chloro-3-oxo-7-oxa-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-Chloro-3-oxo-spiro[3. 6] dec-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-3, 7, 7-trioxo-7#6-thia-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Chloro-3-oxo-spiro [3.4] oct-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloro- isonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Bromo-3-oxo-spiro [3.4] oct-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Methylsulfanyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid

(2S)-2-(2-Fluoro-3-oxo-spiro[3. 5] non-1-en-1-ylamino) 3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl}propanoic acid (2S)-2-[(2-Fluoro-3-oxo-7-oxa-spiro[3. 5] non-1-en-1-yl) amino]-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid <BR> <BR> <BR> <BR> (2S)-2- [ (4, 4-Dimethyl-2-methylsulfanyl-3-oxo-cyclobut-1-enyl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid <BR> <BR> <BR> <BR> (2S)-2- [ (2-Isopropylsu Ifanyl-4, 4-dimethyl-3-oxo-cyclobut-1-enyl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(2-lsopropylsu If anyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2- [ (2-Isopropylsu Ifanyl-4, 4-dimethyl-3-oxo-cyclobut-1-enyl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2-[(2-lsopropylsulfanyl-3-oxo-spiro [3.5] non-1-en-1-yl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2-[(2-lsopropylsulfanyl-3-oxo-7-oxa-spiro [3.5] non-1-en-1-yl) amino]-3- [4- ( [2, 7] naphthyridin-1-ylamino) phenyl] propanoic acid (2S)-2- [ (2-Bromo-3-oxo-spiro [3.4] octa-1,6-dien-1-yl) amino]-3- {4- [ (3,5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S)-2-[(7-Acetyl-2-bromo-3-oxo-7-aza-spiro[3. 5] non-1-en-1-yl) amino]-3- {4-[(3,5-dichloroisonicotinoyl)amino]phenyl}propanoic acid (2S)-2-[(2-Cyclohexyl-3-oxo-spiro [3.5] non-1-en-1-yl)amino]-3-{4-[(3, 5- dichloroisonicotinoyl) amino] phenyl} propanoic acid (2S) 3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl}-2-(2-methyl-3-oxo- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(3-oxo-2- propyl- spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-3- {4- [ (3, 5-Dichloroisonicotinoyl) amino] phenyl}-2- (2- [1, 3] dithian-2-yl-3- oxo-spiro [3.5] non-1-en-1-ylamino) propanoic acid (2S)-2- (2-Bromo-3-oxo-spiro [3. 5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloro- 1-oxy-pyridine-4-carbonyl) amino] phenyl} propanoic acid 2- (2-Chloro-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloro-1-oxy- pyridine-4-carbonyl) amino] phenyl} propanoic acid

and the salts, solvates, hydrates, N-oxides and carboxylic acid esters thereof.

Particularly useful carboxylic acid esters thereof include the methyl, ethyl, propy, i-propyl and t-butyl esters.

Particularly useful ester prodrugs of compounds of the invention include : Ethyl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoate Isopropyl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5- dichloroisonicotinoyl)amino]phenyl}propanoate t-Butyl (2S)-2-(2-bromo-3-oxo-spiro[3. 5] non-1-en-1-ylamino)-3- {4- [ (3, 5- dichloroisonicotinoyl) amino] phenyl} propanoate 1-Methyl-piperidin-4-yl (2S)-2-(2-bromo-3-oxo-spiro[3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate Phenyl (2S)-2- (2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3-{4-[(3, 5- dichloroisonicotinoyl) amino] phenyl} propanoate Cyclopentyl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate 2-Imidazol-1-yl-ethyl (2S)-2- (2-bromo-3-oxo-spiro [3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate Neopentyl (2S)-2-(2-bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3 , 5- dichloroisonicotinoyl) amino] phenyl} propanoate Tetrahydro-furan-3-yl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl}propanoate Pyridin-4-ylmethyl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)-3- {4-[(3,5-dichloroisonicotinoyl) amino] phenyl}propanoate Tetrahydropyran-4-yl (2S)-2- (2-bromo-3-oxo-spiro [3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate 5-Methyl-2-oxo- [1, 3] dioxol-4-ylmethyl (2S)-2- (2-bromo-3-oxo- spiro [3.5] non-1-en-1-ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino]- phenyl} propanoate

1-Methyl-pyrrolidin-3-yl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate 2,3-Dihydroxypropyl (2S)-2-(2-bromo-3-oxo-spiro [3.5] non-1-en-1-ylamino)- 3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate Tetrahydrofuran-2-ylmethyl (2S)-2- (2-bromo-3-oxo-spiro [3.5] non-1-en-1- ylamino)-3- {4- [ (3, 5-dichloroisonicotinoyl) amino] phenyl} propanoate and the salts, solvates, hydrates and N-oxides thereof.

Compounds according to the invention are potent and selective inhibitors of a4 integrins. The ability of the compounds to act in this way may be simply determined by employing tests such as those described in the Examples hereinafter.

The compounds are of use in modulating cell adhesion and in particular are of use in the prophylaxis and treatment of diseases or disorders including inflammation in which the extravasation of leukocytes plays a role and the invention extends to such a use and to the use of the compounds for the manufacture of a medicament for treating such diseases or disorders, Diseases or disorders of this type include inflammatory arthritis such as rheumatoid arthritis vasculitis or polydermatomyositis, multiple sclerosis, allograft rejection, diabetes, inflammatory dermatoses such as psoriasis or dermatitis, asthma and inflammatory bowel disease.

For the prophylaxis or treatment of disease the compounds according to the invention may be administered as pharmaceutical compositions, and according to a further aspect of the invention we provide a pharmaceutical composition which comprises a compound of formula (1) together with one or more pharmaceutical acceptable carriers, excipients or diluents.

Pharmaceutical compositions according to the invention may take a form suitable for oral, buccal, parenteral, nasal, topical or rectal administration, or a form suitable for administration by inhalation or insufflation.

For oral administration, the pharmaceutical compositions may take the form of, for example, tablets, lozenges or capsules prepared by conventional means with pharmaceutical acceptable excipients such as binding agents (e. g. pregelatinised maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose) ; fillers (e. g. lactose, microcrystalline cellulose or calcium hydrogen phosphate); lubricants (e. g. magnesium stearate, talc or silica) ; disintegrants (e. g. potato starch or sodium glycollate) ; or wetting agents (e. g. sodium lauryl sulphate). The tablets may be coated by methods well known in the art. Liquid preparations for oral administration may take the form of, for example, solutions, syrups or suspensions, or they may be presented as a dry product for constitution with water or other suitable vehicle before use. Such liquid preparations may be prepared by conventional means with pharmaceutical acceptable additives such as suspending agents, emulsifying agents, non- aqueous vehicles and preservatives. The preparations may also contain buffer salts, flavouring, colouring and sweetening agents as appropriate.

Preparations for oral administration may be suitably formulated to give controlled release of the active compound.

For buccal administration the compositions may take the form of tablets or lozenges formulated in conventional manner.

The compounds for formula (1) may be formulated for parenteral administration by injection e. g. by bolus injection or infusion. Formulations for injection may be presented in unit dosage form, e. g. in glass ampoule or multi dose containers, e. g. glass vials. The compositions for injection may take such forms as suspensions, solutions or emulsions in oily or

aqueous vehicles, and may contain formulatory agents such as suspending, stabilising, preserving and/or dispersing agents. Alternatively, the active ingredient may be in powder form for constitution with a suitable vehicle, e. g. sterile pyrogen-free water, before use.

In addition to the formulations described above, the compounds of formula (1) may also be formulated as a depot preparation. Such long acting formulations may be administered by implantation or by intramuscular injection.

For nasal administration or administration by inhalation, the compounds for use according to the present invention are conveniently delivered in the form of an aerosol spray presentation for pressurised packs or a nebuliser, with the use of suitable propellant, e. g. dichlorodifluoromethane, trichloro-fluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas or mixture of gases.

The compositions may, if desired, be presented in a pack or dispenser device which may contain one or more unit dosage forms containing the active ingredient. The pack or dispensing device may be accompanied by instructions for administration.

The quantity of a compound of the invention required for the prophylaxis or treatment of a particular condition will vary depending on the compound chosen, and the condition of the patient to be treated. In general, however, daily dosages may range from around 100ng/kg to 100mg/kg e. g. around 0. 01 mg/kg to 40mg/kg body weight for oral or buccal administration, from around 10ng/kg to 50mg/kg body weight for parenteral administration and around 0.05mg to around 1000mg e. g. around 0.5mg to around 1000mg for nasal administration or administration by inhalation or insufflation.

The compounds of the invention may be prepared by a number of processes as generally described below and more specifically in the Examples hereinafter. In the following process description, the symbols Arl, Ar2, Alk, Rl, R2, R3, Li, L2, Alk1, Rx, RY, Rz and n when used in the formulae depicted are to be understood to represent those groups described above in relation to formula (1) unless otherwise indicated. In the reactions described below, it may be necessary to protect reactive functional groups, for example hydroxy, amino, thio or carboxy groups, where these are desired in the final product, to avoid their unwanted participation in the reactions. Conventional protecting groups may be used in accordance with standard practice [see, for example, Green, T. W. in "Protective Groups in Organic Synthesis", John Wiley and Sons, 1999]. In some instances, deprotection may be the final step in the synthesis of a compound of formula (1) and the processes according to the invention described hereinafter are to be understood to extend to such removal of protecting groups. For convenience the processes described below all refer to a preparation of a compound of formula (1) but clearly the description applies equally to the preparation of compounds of formula (2).

Thus according to a further aspect of the invention, a compound of formula (1) in which R is a-C02H group may be obtained by hydrolysis of an ester of formula (1 a) : where Alk represents a group

[where Alk7 is an alkyl group for example a C1 6alkyl group].

The hydrolysis may be performed using either an acid or a base depending on the nature of Alk7, for example an organic acid such as trifluoroacetic acid or an inorganic base such as lithium, sodium or potassium hydroxide optionally in an aqueous organic solvent such as an amide e. g. a substituted amide such as dimethylformamide, an ether e. g. a cyclic ether such as tetrahydrofuran or dioxane or an alcohol e. g. methanol at a temperature from ambient to the reflux temperature. Where desired, mixtures of such solvents may be used.

According to a further aspect of the invention a compound of formula (1) may be prepared by condensation of a compound of formula (3): where compounds of formula (3) exist as two tautomeric isomers, (3a) and (3b) in solution with an amine of formula R1R2NH, an alcohol of formula Rl OH or a thiol of formula R1 SH.

The reaction may be performed in an inert solvent or mixture of solvents, for example a hydrocarbon such as an aromatic hydrocarbon e. g. benzene or toluene and/or a halogenated hydrocarbon such as 1,2- dichloroethane, or dichloromethane at a temperature from 0°C to the reflux temperature. Where necessary, for example when a salt of an

amine R1R2NH is used, an organic base such as diisopropylethylamine can be added.

Any carboxylic acid group present in the intermediate of formula (3) or the amine R1R2NH, alcohol R1OH or thiol RLSH may need to be protected during the displacement reaction, for example as an ethyl ester. The desired acid may then be obtained through subsequent hydrolysis, for example as particularly described above and generally described below.

The displacement reaction may also be carried out on an intermediate of formula 4 (see below) under the conditions just described.

Where desired the displacement reaction may also be performed on an intermediate of formulae (3), R1R2NH, R1OH or RLSH which is linked, for example via its R, R1 or R3 group, to a solid support, such as a polystyrene resin. After the reaction the desired compound of formula (1) may be displaced from the support by any convenient method, depending on the original linkage chosen.

Intermediates of formulae (3) R1R2NH, R10H and RLSH may be obtained from simpler, known compounds by one or more standard synthetic methods employing substitution, oxidation, reduction or cleavage reactions. Particular substitution approaches include conventional alkylation, arylation, heteroarylation, acylation, thioacylation, halogenation, sulphonylation, nitration, formylation and coupling procedures. It will be appreciated that these methods may also be used to obtain or modify other compounds of formulae (1) and (2a), (2b), (2c) and (2d) where appropriate functional groups exist in these compounds.

Thus intermediates of formula (3) may be obtained by hydrolysis of intermediates of formula (4):

where Ra represents a C1 6alkyl group or a silyl group such as a tbutyldimethylsilyl group.

The hydrolysis may be performed using an acid, for example an inorganic acid such as hydrochloric acid in an organic solvent such as an ether e. g. diethylether, or an alcohol e. g. ethanol optionally in the presence of added water at a temperature from about ambient to 80°C.

Intermediates of formula (4) may be obtained by the cycloaddition of an intermediate of formula (5): with a ketene of formula (6): preformed or generated in situ during the cycloaddition reaction from an acid chloride of formula (7):

The reaction may be performed in the presence of an organic base such as an amine e. g. triethylamine or N, N-diisopropylethylamine or a cyclic amine such as pyridine or N-methylmorpholine optionally in an organic solvent such as an ether e. g. diethylether or diisopopylether.

Acid chlorides of formula (7) may be obtained from the corresponding acids by a convenient method of generating acid halides, for example by reaction with thionyl chloride or oxalyl chloride under such standard conditions as are well known in the art.

Compounds of formula (1a) in which Rz is for example a halogen atom may be obtained from compounds of formula (1a) in which Rz is a hydrogen atom by reaction with a halogen source such as bromine or a halosuccinamide e. g. chloro or bromosuccinamide. The reaction may be performed in a solvent such as an ether e. g. a cyclic ether such as tetrahydrofuran at a temperature from about 0° to 30°. When bromine is used as halogen source the reaction may optionally be performed in the presence of added base such as an amine e. g. triethylamine.

Further compounds of formula (1 a) in which RZ is a group ~L1 (Alk1) n (R3) v in which L1 is for example a Se, S, O or N (R8) may be prepared by reaction of an intermediate of formula HL1 (Alk1) n (R3) v with a compound of formula (1 a) in which RZ is a hydrogen atom. The reaction may be performed in an organic solvent such as an ether e. g. a cyclic ether such as tetrahydrofuran at around room temperature optionally in the presence of a base such as an amine e. g. triethylamine.

Intermediate compounds of formula (4) may also be obtained from squaric acid derivations by such well known methods in the art as those of MacDougall, J. M. et al, J. Org. Chem, 64 5979-83 (1999); Hergueta, R.

A., J. Org. Chem., 64,5979-83, (1999); Heileman, M. J. et al, J. Am.

Chem. Soc. 120, 3801-2, (1998); Yamamoto, Y. et al, J. Org. Chem, 62, 1292-8 (1997); Zhag, D. et al, J. Org. Chem. 61,2594-5 (1996); Petasis, N. A. et al, Synlett, 155-6 (1996); Petasis, N. A. et al, Tetrahedron Lett., 36,6001-4, (1995); Turnbull, P. et al, J. Org. Chem 60,644-9 (1995); Yerxa, B. R. et al, Tetrahedron, 50,6173-80 (1994); Ezcurra, J. E. et al, Tetrahedron Lett, 34,6177-80, (1993); Ohno, M. et al, Tetrahedron Lett., 34,4807-10, (1993); Yerxa, B. R. et al, Tetrahedron Lett. 33,7811-14 (1992); Xu, S. L. et al, J. Org. Chem, 57,326-8 (1992) and Kravs, J. L. et al, Tetrahedron Lett. 28,1765-8 (1987).

Further compounds of the invention and intermediates thereto may be prepared by alkylation, arylation or heteroarylation. For example, compounds containing a-L1H or-L2H group (where L1 and L2 is each a linker atom or group) may be treated with a coupling agent R3 (Alk1) nX1 or Ar1X1 respectively in which x1 is a leaving atom or group such as a halogen atom, e. g. a fluorine, bromine, iodine or chlorine atom or a sulphonyloxy group such as an alkylsulphonyloxy, e. g. trifluor- methylsulphonyloxy or arylsulphonyloxy, e. g. p-toluenesulphonyloxy group.

The reaction may be carried out in the presence of a base such as a carbonate, e. g. caesium or potassium carbonate, an alkoxide, e. g. potassium t-butoxide, or a hydride, e. g. sodium hydride, or an organic amine e. g. triethylamine or N, N-diisopropylethylamine or a cyclic amine, such as N-methylmorpholine or pyridine, in a dipolar aprotic solvent such as an amide, e. g. a substituted amide such as dimethylformamide or an ether, e. g. a cyclic ether such as tetrahydrofuran.

Compounds of formula Ar1X1 may be prepared from alcohols of formula Ar1OH by reaction with a halogenating agent, for example a phosphorous

oxyhalide such as phosphorous oxychloride at an elevated temperature e. g. 110°C.

Intermediate alcohols of formula Ar1 OH in which, for example, Ar1 represents a 2,6-naphthyridine may be prepared by methods well known to a person skilled in the art, e. g. by the method of Sakamoto, T. et al [Chem. Pharm. Bull. 33,626-633, (1985)].

Alternatively alkylating agents of formula Ar1X1 in which, for example, Ar1 represents a 2,6-naphthyridine may be prepared by reaction of a 2,6- naphthyridine N-oxide or N, N'-dioxide with a halogenating agent, e. g. a phosphorous oxyhalide such as phosphorous oxychloride to give a 1-halo or 1,5-dihalo-2,6-napthyridine respectively. In the case of 1,5-dihalo-2,6- napthyridines each halogen atom may be substituted separately by a reagent such as HL2Ar2AIkN (R2) H or HL3 (Alk2) tL4 (R4) U by the particular methods just described above.

2,6-Napthyridine N-oxides and N, N'-dioxides may be generated from the corresponding 2,6-napthyridines by the general methods of synthesis of N-oxides described below or they may be synthesised by the methods of Numata, A. et al (Synthesis, 1999,306-311).

Further alkylating agents of formula Ar1X1 in which, for example, Ar1 represents a 2,6-naphthyridine, may be prepared by the methods of Giacomello G. et al [Tetrahedron Letters, 1117-1121 (1965)], Tan, R. and Taurins, A. [Tetrahedron Lett., 2737-2744, (1965)], Ames, D. E. and Dodds, W. D. [J. Chem. Soc. Perkin 1,705-710 (1972)] and Alhaique, F. et a/ [Tetrahedron Lett., 173-174 (1975)].

Intermediate alcohols of formula ArlOH in which Ar1 represents an optionally substituted 2,7-naphthyridin-1-yl group may be prepared by

methods well known to a person skilled in the art, e. g. by the method of Sakamoto, T. et al [Chem. Pharm. Bull. 33,626-633, (1985)] or Baldwin, J, J. et al [J. Org. Chem, 43,4878-4880, (1978)]. Thus for example the method of Baldwin may be modified to allow the synthesis of intermediate 3-substituted 2,7-naphthyridin-1-yl groups of formula ArlOH as depicted in Scheme 1.

Reaction of an optionally substituted 4-methyl-3-cyano pyridine of formula (8) with a N, N-dimethylformamide di-C1-6alkyl acetal, e. g. N, N-dimethyl- formamide diethyl acetal, in a dipolar solvent such as an amide e. g. a substituted amide such as dimethylformamide at an elevated temperature e. g. 140-150° gives a compound of formula (9) or (10) or a mixture thereof depending on the nature of the group R16.

Scheme 1 NMe2 0 Me CN R210 OR 21 R 16 R16 / \ L- j j 2 (Rl6g-1-N J Rls9_ / N N (8) (9) (10) sat. HCI (g)/AcOH ir R = C1 6alkyl group 16 Rs N tN OH (R 16 NH OH OH

Compounds of formula (9) or (10) may be cyclise to 3-substituted 2,7- naphthyridin-1-yl alcohol of formula (11) by treatment with an acid e. g. an inorganic acid such as hydrochloric acid or hydrobromic acid or an acidic gas such as hydrogen chloride gas in an organic solvent e. g. an organic acid such as acetic acid optionally in the presence of water at a temperature from about ambient to 50°C.

Alternatively alkylating agents of formula Ar1X1 in which Ar1 represents an optionally substituted 2,7-naphthyridin-yl group may be prepared by reaction of a 2,7-naphthyridine N-oxide or N, N'-dioxide with a halogenating agent, e. g. a phosphorous oxyhalide such as phosphorous oxychloride to give a 1-halo or 1,6-dihalo-and/or-1, 8-dihalo-2,7- napthyridine respectively. In the case of 1,6-dihalo- and/or 1,8-dialo-2,6- napthyridines each halogen atom may be substituted separately by a reagent such as HL2Ar2AIkN (R2) H or HL3 (Alk2) tL4 (R4) u by the particular methods just described above.

2,7-Napthyridine N-oxides and N, N'-dioxides may be generated from the corresponding 2,7-napthyridines by the general methods of synthesis of N-oxides described below or they may be synthesised by the methods of Numata, A. et al (Synthesis, 1999,306-311).

Further alkylating agents of formula Ar1X1 in which, for example, Ar1 represents a 2,7-naphthyridin-1-yl, may be prepared by the methods of Wenkert E. et al J. Am. Chem. Soc. 89,6741-5 (1967), and Aust. J.

Chem. 433 (1972), and Sheffield D. J. J. Chem. Soc. Perkin. Trans I, 2506 (1972).

Intermediate alcohols of formula Ar1OH in which Ar1 represents a 3- substituted isoquinolin-1-yl group may be prepared by methods well known to a person skilled in the art, e. g. by the methods of Wu M.-J. et al Tetrahedron, 55,13193-200 (1999), Hiebl J. et al Tetrahedron Lett. 40, 7935-8 (1999), Nagarajan A. et al Indian J. Chem., Sect. B, 28B, 67-78 (1989), Brun E. M. et al Synlett, 7,1088-90 (1999) and Brun, E. M. et al Synthesis, 273-280 (2000).

Further alkylating agents of formula Ar1X1 in which, for example, Ar1 represents a isoquinolin-1-yl group, may be prepared by the methods of Falk H. et a/Monatsch. Chem. 25,325-33 (1994), and Deady, L. W. et al Aust. J. Chem 42,1029-34 (1989).

In a further example intermediates of formula R1R2NH may be obtained by reaction of a compound of formula Ar1 L2H with a compound of formula X1Ar2AlkN (R2) H under the reaction conditions just described Compounds of formula Ar1 L2H in which, for example Art represents a 2,6- naphthyridine and L2 is a-N (R8)- group, may be prepared from substituted

4-cyano-3-cyanomethylpyridines by the methods of Alhaique, F. et al (ibid and Gazz. Chim. Ital. 1975,105,1001-1009) or from 3-fomylpyridines by the methods of Molina, P. at al (Tetrahedron 1992,48,4601-4616).

Compounds of formula Ar1 L2H in which, for example Ar1 represents a 2,7- naphthyridin-1-yl group and L2 is a-N (R8)- group, may be prepared from substituted 4-formylpyridines by the methods of Molina, P. et al Tetrahedron, 48,4601-4616, (1992), or by the methods described in US 3,938,367.

Compounds of formula ArlL2H in which, for example Ar1 represents a 3- substituted isoquinolin-1-yl group and L2 is a-N (R8)- group, may be prepared by the methods of Bordner, J. et al J. Med. Chem. 31, 1036-9 (1988), Tovar J. D. et al J. Org. Chem., 64,6499-6504 (1999), Karser E.

M. et al Synthesis, 11, 805-6 (1974), and Molino, P et al J. Chem. Soc.

Perkin Trans. 1, 1727-31 (1990).

In another example, compounds containing a-L1H or-L2H or group as defined above may be functionalised by acylation or thioacylation, for example by reaction with one of the alkylating agents just described but in which X1 is replaced by a-C (O) X2,-C (S) X2,-N (R8) COX2 or-N (R8) C (S) X2 group in which X2 is a leaving atom or group as described for X1. The reaction may be performed in the presence of a base, such as a hydride, e. g. sodium hydride or an amine, e. g. triethylamine or N-methyl- morpholine, in a solvent such as a halogenated hydrocarbon, e. g. dichloromethane or carbon tetrachloride or an amide, e. g. dimethyl- formamide, at for example ambient temperature. Alternatively, the acylation may be carried out under the same conditions with an acid (for example one of the alkylating agents described above in which x1 is replaced by a-C02H group) in the presence of a condensing agent, for example a diimide such as 1- (3-dimethylaminopropyl)-3-ethylcarbodiimide

or N, N'-dicyclohexylcarbodiimide, advantageously in the presence of a catalyst such as a N-hydroxy compound e. g. a N-hydroxytriazole such as 1-hydroxybenzotriazole. Alternatively the acid may be reacted with a chloroformate, for example ethylchloroformate, prior to the desired acylation reaction.

In a further example compounds may be obtained by sulphonylation of a compound containing an-OH group by reaction with one of the above alkylating agents but in which x1 is replaced by a-S (O) Hal or-S02Hal group [in which Hal is a halogen atom such as chlorine atom] in the presence of a base, for example an inorganic base such as sodium hydride in a solvent such as an amide, e. g. a substituted amide such as dimethylformamide at for example ambient temperature.

In another example, compounds containing a-L1H or-L2H group as defined above may be coupled with one of the alkylation agents just described but in which x1 is replaced by an-OH group in a solvent such as tetrahydrofuran in the presence of a phosphine, e. g. triphenylphosphine and an activator such as diethyl, diisopropyl-or dimethylazodicarboxylate.

In a further example, ester groups-CO2R5,-CO2R11 or-CO2Alk7 in the compounds may be converted to the corresponding acid [-C02H] by acid- or base-catalysed hydrolysis depending on the nature of the groups R5, R11 or Alk7. Acid-or base-catalysed hydrolysis may be achieved for example by treatment with an organic or inorganic acid, e. g. trifluoroacetic acid in an aqueous solvent or a mineral acid such as hydrochloric acid in a solvent such as dioxan or an alkali metal hydroxide, e. g. lithium hydroxide in an aqueous alcohol, e. g. aqueous methanol.

In a further example,-OR5 or -OR14 groups [where R5 or R14 each represents an alkyl group such as methyl group] in compounds of formula (1) may be cleaved to the corresponding alcohol-OH by reaction with boron tribromide in a solvent such as a halogenated hydrocarbon, e. g. dichloromethane at a low temperature, e. g. around-78°C.

Alcohol [-OH] groups may also be obtained by hydrogenation of a corresponding-OCH2R14 group (where R14 is an aryl group) using a metal catalyst, for example palladium on a support such as carbon in a solvent such as ethanol in the presence of ammonium formate, cyclohexadiene or hydrogen, from around ambient to the reflux temperature. In another example,-OH groups may be generated from the corresponding ester [C02Alk7 or C02R5] or aldehyde [-CHO] by reduction, using for example a complex metal hydride such as lithium aluminium hydride or sodium borohydride in a solvent such as methanol.

In another example, alcohol-OH groups in the compounds may be converted to a corresponding-OR5 or-OR14 group by coupling with a reagent R50H or R140H in a solvent such as tetrahydrofuran in the presence of a phosphine, e. g. triphenylphosphine and an activator such as diethyl-, diisopropyl-, or dimethylazodicarboxylate.

Aminosulphonylamino [-NHSo2NHR3 or-NHSO2NHAr1] groups in the compounds may be obtained, in another example, by reaction of a corresponding amine [-NH2] with a sulphamide R3NHS02NH2 or Ar1NHSO2NH2 in the presence of an organic base such as pyridine at an elevated temperature, e. g. the reflux temperature.

In another example compounds containing a-NHCSAr1,-CSNHAr1,- NHCSR3 or-CSNHR3 may be prepared by treating a corresponding compound containing a-NHCOAr1,-CONHAr1,-NHCOR3 or-CONHR3

group with a thiation reagent, such as Lawesson's Reagent, in an anhydrous solvent, for example a cyclic ether such as tetrahydrofuran, at an elevated temperature such as the reflux temperature.

In a further example amine (-NH2) groups may be alkylated using a reductive alkylation process employing an aldehyde and a borohydride, for example sodium triacetoxyborohyride or sodium cyanoborohydride, in a solvent such as a halogenated hydrocarbon, e. g. dichloromethane, a ketone such as acetone, or an alcohol, e. g. ethanol, where necessary in the presence of an acid such as acetic acid at around ambient temperature.

In a further example, amine [-NH2] groups in compounds of formula (1) may be obtained by hydrolysis from a corresponding imide by reaction with hydrazine in a solvent such as an alcohol, e. g. ethanol at ambient temperature.

In another example, a nitro [-N02] group may be reduced to an amine [- NH2], for example by catalytic hydrogenation using for example hydrogen in the presence of a metal catalyst, for example palladium on a support such as carbon in a solvent such as an ether, e. g. tetrahydrofuran or an alcohol e. g. methanol, or by chemical reduction using for example a metal, e. g. tin or iron, in the presence of an acid such as hydrochloric acid.

Aromatic halogen substituents in the compounds may be subjected to halogen-metal exchange with a base, for example a lithium base such as n-butyl or t-butyl lithium, optionally at a low temperature, e. g. around- 78°C, in a solvent such as tetrahydrofuran and then quenched with an electrophile to introduce a desired substituent, for example, a formyl group may be introduced by using dimethylformamide as the electrophile ; a thiomethyl group may be introduced by using dimethyldisulphide as the electrophile.

In another example, sulphur atoms in the compounds, for example when present in a linker group L1 or L2 may be oxidised to the corresponding sulphoxide or sulphone using an oxidising agent such as a peroxy acid, e. g. 3-chloroperoxybenzoic acid, in an inert solvent such as a halogenated hydrocarbon, e. g. dichloromethane, at around ambient temperature.

In another example compounds of formula Ar1X1 (where X1 is a halogen atom such as a chlorine, bromine or iodine atom) may be converted to such compounds as Ar1CO2R20 (in which R20 is an optionally substituted alkyl, aryl or heteroaryl group), Ar1 CHO, Ar1 CHCHR20, Ar1 CCR20, ArlN (R20) H, Ar1 N (R20) 2, for use in the synthesis of for example compounds of formula Ar1L2Ar2AlkN (R2) H, using such well know and commonly used palladium mediated reaction conditions as are to be found in the general reference texts Rodd's Chemistry of Carbon Compounds, Volumes 1-15 and Supplementals (Elsevier Science Publishers, 1989), Fieser and Fieser's Reagents for Organic Synthesis, Volumes 1-19 (John Wiley and Sons, 1999), Comprehensive Heterocyclic Chemistry, Ed.

Katritzky et al, Volumes 1-8,1984 and Volumes 1-11,1994 (Pergamon), Comprehensive Organic Functional Group Transformations, Ed. Katritzky et al, Volumes 1-7,1995 (Pergamon), Comprehensive Organic Synthesis, Ed. Trost and Flemming, Volumes 1-9, (Pergamon, 1991), Encyclopedia of Reagents for Organic Synthesis, Ed. Paquette, Volumes 1-8 (John Wiley and Sons, 1995), Larock's Comprehensive Organic Transformations (VCH Publishers Inc., 1989) and March's Advanced Organic Chemistry (John Wiley and Sons, 1992).

N-oxides of compounds of formula (1) may be prepared for example by oxidation of the corresponding nitrogen base using an oxidising agent such as hydrogen peroxide in the presence of an acid such as acetic acid, at an elevated temperature, for example around 70°C to 80°C, or

alternatively by reaction with a peracid such as peracetic acid in a solvent, e. g. dichloromethane, at ambient temperature.

Salts of compounds of formula (1) may be prepared by reaction of a compound of formula (1) with an appropriate base in a suitable solvent or mixture of solvents e. g. an organic solvent such as an ether e. g. diethylether, or an alcohol, e. g. ethanol using conventional procedures.

Where it is desired to obtain a particular enantiomer of a compound of formula (1) this may be produced from a corresponding mixture of enantiomers using any suitable conventional procedure for resolving enantiomers.

Thus for example diastereomeric derivatives, e. g. salts, may be produced by reaction of a mixture of enantiomers of formula (1) e. g. a racemate, and an appropriate chiral compound, e. g. a chiral base. The diastereomers may then be separated by any convenient means, for example by crystallisation and the desired enantiomer recovered, e. g. by treatment with an acid in the instance where the diastereomer is a salt.

In another resolution process a racemate of formula (1) may be separated using chiral High Performance Liquid Chromatography. Alternatively, if desired a particular enantiomer may be obtained by using an appropriate chiral intermediate in one of the processes described above. Alternatively, a particular enantiomer may be obtained by performing an enantiomer specific enzymatic biotransformation e. g. an ester hydrolysis using an esterase and then purifying only the enantiomerically pure hydrolyse acid from the unreacted ester antipode.

Chromatography, recrystallisation and other conventional separation procedures may also be used with intermediates or final products where it is desired to obtain a particular geometric isomer of the invention.

The following Examples illustrate the invention. All temperatures are in oc.

The following abbreviations are used: NMM-N-methylmorpholine ; EtOAc-ethyl acetate; MeOH-methanol ; BOC-butoxycarbonyl ; DCM-dichloromethane ; AcOH-acetic acid ; DIPEA-diisopropylethylamine ; EtOH-ethanol ; Pyr-pyridine; Ar-aryl ; DMSO-dimethylsulphoxide ; iPr-isopropyl ; Et20-diethylether ; Me-methyl ; THF-tetrahydrofuran, DMF-N, N-dimethylformamide ; FMOC-9-fluorenylmethoxycarbonyl ; DBU-1,8-Diazabicyclo [5,4-0] undec-7-ene; DMAP-4- (dimethylamino) pyridine.

HOBT-1-hydroxybenzotriazole All NMR's were obtained either at 300MHz or 400MHz.

All Intermediates and Examples were named with the aid of Beilstein Autonom (available from MDL Information Systems GmbH, Therdor- Heuss-Allee 108D 60486, Frankfurt, Germany) or were given names that seemed consistent, with the exception that propanoates were named by the IUPAC name rather than the trivial name (propionate) and isonicotinoyl (trivial name) is used in place of pyridine-4-carbonyl.

INTERMEDIATE 1 (+/-)3-Ethoxy-4-methyl-4-propvl-2-cyclobuten-1-one The title compound was prepared using a modification of the method of Wasserman, H. H. et al [J. Org. Chem, 38,1451-1455, (1973)]; to a solution of 2-methyl pentanoyl chloride (3. 91ml) and ethyl ethynylether (5g, 40% solution in hexanes, 28.6mmol) in Et20 (35ml) at room temperature was added triethylamine (9.9ml), with stirring. The reaction

was warmed to 50~ and stirred for 72h prior to cooling and filtration. The filtrate was concentrated in vacuo and the residual oil chromatographed (Si02 ; hexanes 80: EtOAc 20) to give the title compound as a colourless oil (3.71 g, 17.9mmol, 77%). 8H (CDCI3, 300K), 4.84 (1H, s), 4.24-3.98 (2H, m), 2.04 (3H, s), 1.56-1.43 (4H, m), 1.30-1.26 (3H, m), 0.91 (3H, t, J 7.3Hz). m/z (ES+, 70V) 178.1 (MH+).

INTERMEDIATE 2 (+/-) 3-Hydroxy-4-methyl-4-propvl-2-cvclobuten-1-one Intermediate 1 (1g, 59.5mmol) and conc. hydrochloric acid (2ml) were stirred vigorously at room temperature for 48h. The resulting slurry was filtered and the residue washed with water (3 x10ml) and dried under vacuum to give the title compound as an off-white powder (620mg, 44.2mmol, 74%). 8H (CDCl3, 300K) 3.79 (2H, s), 1.59-1.53 (2H, m), 1.41- 1.27 (2H, m), 1.18 (3H, s), 0.85 (3H, t, J 7.3Hz). m/z (ES+, 70V) 140.9 (MH+).

INTERMEDIATE 3 3-Ethoxy-4, 4-dipropyl-2-cyclobuten-1-one The title compound was prepared using a modification of the method of Wasserman, H. H. et al, [J. Org. Chem, 38,1451-1455, (1973)]; triethylamine (29ml) was added dropwise at room temperature to a well- stirred solution of di-n-propylacetyl chloride (13.9g, 85.8mmol) and ethyl ethynylether (15g, 40% solution in hexanes, 85.7mmol) in toluene (120ml.

The reaction was warmed to 60-and stirred for 48h prior to cooling and filtration. The filtrate was concentrated in vacuo and the residual oil chromatographed (Si02 ; hexanes 80: EtOAc 20) to give the title compound as a brown oil (11. 2g, 57. 1mmol, 67%). #H (CDCl3, 300K) 5.02 (1H, s), 4.32 (2H, q, J 7.1Hz), 1.69-1.61 (4H, m), 1.45-1.40 (4H, m), 1.02 (6H, t, J 7.3Hz). m/z (ES+, 70V) 197.1 (MH+).

INTERMEDIATE 4 3-Hydroxy-4, 4-dipropvl-2-cyclobuten-1-one Intermediate 3 (10.2mmol) and 6M hydrochloric acid (10ml) were stirred vigorously at 65g for 72h. The resulting slurry was diluted with DCM (30moi) and distilled water (30ml) and extracted with DCM (3x10m1). The combined extracts were dried (MgS04), filtered and concentrated in vacuo to give the title compound as a pale yellow oil, which crystallised on standing (1.49g, 8.87mmol, 87%).

INTERMEDIATE 5 3-ethoxy-2-hexyl-4, 4-dimethyl-2-cvclobuten-1-one The title compound was prepared using a modification of the method of Wasserman, H. H. et al, [J.. Org. Chem, 38,1451-1455, (1973)]; triethylamine (22mi) was added dropwise at room temperature to a well- stirred solution of isobutyryl chloride (7.3moi, 69mmol) and 1-ethoxy-1- octyne [prepared according to the method of Kocienski, P. et al.

Tetrahedron Lett. 1833,30, (1989)] (6.5g, 63mmol) in diethylether (100ml). The reaction was warmed to 35° and stirred for 96h prior to cooling and filtration. The filtrate was concentrated in vacuo and the residual oil chromatographed (Si02 ; hexanes 80: EtOAc 20) to give the title compound as a brown oil (8.6g, 38mmol, 61%). #H (CDCl3, 300K) 4.34 (2H, d, J 7.1 Hz), 2.05 (2H, dd, J 5.6Hz, 7.3Hz), 1.44 (3H, t, J 7.1 Hz), 1.27-1.12 (8H, m), 1.23 (6H, s), 0.89 (3H, t, J 2.7Hz). m/z (ES+, 70V) 225.0 (MH+).

INTERMEDIATE 6 2-Hexvl-3-hvdroxy-4, 4-dimethvl-2-cvclobuten-1-one Intermediate 5 (7.6g, 34. Ommol) and 6M hydrochloric acid (10ml) were stirred vigorously at 100° for 18h. The resulting slurry was diluted with DCM (30ml) and distilled water (30mi) and extracted with DCM (3 x10ml).

The combined extracts were dried (MgS04), filtered and concentrated in vacuo. The residue was triturated with hexanes and filtered to give the title compound as an off-white powder (6.5g, 33. Ommol, 98%). 8H (CDC13, 300K) 2.01 (2H, t, J 7. 0Hz), 1.49-1.44 (2H, m), 1.34-1. 19 (14H, m), 0.89- 0.84 (3H, m). m/z (ES+, 70V) 197.0 (MH+).

INTERMEDIATE 7 (+/-) 4-Benzvl-3-ethoxv-4-methvl-2-cyclobuten-1-one The title compound was prepared using a modification of the procedure of Wasserman et al [J. Org. Chem, 38,1451-1455, (1973)]; triethylamine (20ml) was added to a stirred solution containing a-methyl tetrahydro- cinnamoyl chloride (5g, 27.5mmol) and ethyl ethynylether (6g, 40% soln. in hexanes, 85.7mmol) and the resulting slurry heated to 35~ for 3d. The crude reaction mixture was then filtered and the residue concentrated in vacuo. The residual oil was chromatographed (Si02, EtOAc 20: hexanes 80) to give the title compound as a pale brown oil (4.91g, 86%). 60H (CDCl3, 300K) 7.19-7.05 (5H, m), 4.56 (1H, s), 4.09-4.00 (1H, m), 3.97- 3.89 (1H, m), 2.86 (1H, d, J 14.0Hz), 2.86 (1H, d, J 14. 0Hz), 1.30 (3H, t, J 7.1 Hz), 1.24 (3H, s). m/z (ES+, 70V) 216.9 (MH+).

INTERMEDIATE 8 (+/-)4-Benzvl-3-hydroxy-4-methvl-2-cvclobuten-1-one Intermediate 7 (4.5g, 20.9mmol) and hydrochloric acid (6M, 10ml) were stirred at room temperature for 48h. Filtration of the resulting slurry and washing of the residue with water (3x15ml) gave the title compound as a pale brown powder (3.92g, 20.8mmol, 99%). 8H (CDCl3, 300K) 7.03-6.83 (5H, m), 4.24 (1H, s), 2.52 (2H, s), 0.94 (3H, s). m/z (ES+, 70V) 189.1 (MH+).

INTERMEDIATE 9

3-Cyano-4-(2-(N.N-dimethylamino)ethylen-1-yl)pyridine A solution of 4-methyl-3-cyanopyridine [prepared acccording to Ref: J.

Prakt. Chem. 338, 663 (1996)], (8.0g, 67.8mmol) and N, N- dimethylformamide diethyl acetal (11. Og, 74.8mmol) in dry DMF (50moi) was stirred at 140g under N2 for 2 days. An additional portion of N, N,- dimethylformamide diethyl acetal (5g) was added and stirred at 1409 for 4h. The volatiles were removed in vacuo and the obtained dark oil partitioned between EtOAc (300ml) and water (50ml). The phases were separated and the aqueous layer re-extracted with EtOAc (3x100ml). The combined organic extracts were washed with brine (30moi), dried (Na2SO4), treated with activated charcoal, filtered and evaporated in vacuo to afford essentially pure title compound as a dull orange solid (10.1g, 85%). AH (CDCl3) 8.49 (1H, s), 8.25 (1h, d, J 5.9Hz), 7.29 (1H, d, J 13.2Hz), 7.09 (1H, d, J 5.9Hz), 5.25 (1H, d, J 13.2Hz) and 2.99 (6H, s); m/z (ES+, 70V) 174 (MH+).

INTERMEDIATE 10 1-Hydroxv-2, 7-naphthvridine hydrochloride salt HCI gas was bubbled through a stirred solution of Intermediate 9 (6.2g, 3.58mmol) in glacial acetic acid (50ml) and water (0.64ml, 3.55mmol) for 1-2min. The reaction mixture was stirred in a stoppered flask at 40~ for 18h. The volatiles were removed in vacuo affording a dark residue, which was treated with water (3x20ml) and re-evaporated in vacuo. The obtained dark semi-solid was treated with 40ml warm ethanol, ice-cooled, and the undissolved solid collected by filtration affording the title compound as a green coloured solid (5.2g, 80%) 8H (DMSO-d6) 12.5 (1 H, br s), 9.38 (1 H, s), 8.84 (1H, d, J 7. 0Hz), 8.15 (1H, d, J 7. 0Hz), 7.89 (1H, br dd, J 7.0, 5.0Hz) and 6.85 (1 H, d, J 7.0Hz); m/z (ES+, 70V), 147 (MH+).

INTERMEDIATE 11 1-Chloro-2, 7-naphthvridine Intermediate 10 (5.2g, 28.5mmol) was stirred with phosphorous oxychloride (75ml) at 110° for 24h. The volatiles were removed in vacuo affording a dark oil which was poured into an ice-bath cooled mixture of saturated aqueous NaHCO3 (100ml containing 20g solid NaHCO3) and EtOAc (100ml). After thorough mixing the phases were separated and the aqueous layer re-extracted with EtOAc (2x75ml). The combined organic extracts were washed with brine (15ml), dried (Na2SO4) and evaporated in vacuo to afford the title compound as a yellow solid (4. 0g, 85%) 8H (CDCl3) 9.45 (1H, s), 8.81 (1H, d, J 5.7Hz), 8.47 (1H, d, J 5.7Hz), 7.66 (1H, d, J 5.7Hz) and 7.60 (1H, d, J 5.7Hz); m/z (ES+, 70V) 165 and 167 (MH+).

INTERMEDIATE 12 Ethyl (2S)-2-amino-3-f4- (2, 7-naphthvridin-1-ylamino) phenvil propanoate A solution of ethyl- (S)-3- [4-aminophenyl]-2- [t-butoxycarbonylamino] propanoate (638mg, 2.07mmol) and Intermediate 11 (310mg, 1.88mmol) in ethoxyethanol (2ml) was stirred at 120g for 15 min and at 100-for 1h under nitrogen. The volatiles were removed in vacuo and the dark residue partitioned between EtOAc (70ml) and saturated aqueous NaHCO3 (10ml). The phases were separated and the aqueous layer re-extracted with EtOAc (2x30ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford a dark foam. Chromatography (Si02 ; 5 to 10% MeOH/DCM) afforded a mixture of ethyl- (S)-3- [4- (2, 7-naphthyridin-1-ylamino) phenyl]-2- [ (t-butoxycarbonyl) amino] propanoate and some of the title compound (730mg). This mixture was treated with a solution of trifluoroacetic acid (5ml) and DCM (5ml) at room temperature for 1h. The volatiles were removed in vacuo and the

residue partitioned between EtOAc (75ml) and saturated aqueous NaHCO3 (20ml). The phases were separated and the aqueous layer re- extracted with EtOAc (3x30ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford an orange solid. Chromatography (Si02 ; 10% MeOH/DCM) afforded the title compound as a straw-coloured solid (420mg, 60% over two steps). 8H (CDCl3) 10.70 (1 H, s), 10.31 (1 H, s), 9.44 (1 H, d, J 5.6Hz), 8.94 (1H, d, J 5.6Hz), 8.55 (1H, d, J 7.3Hz), 8.54 (2H, d, J 8.5Hz), 8.46 (1 H, d, J 5.6Hz), 7.94 (2H, d, J 8.5Hz), 4.84 (2H, q, J 7. 1 Hz), 4.35 (1 H, t, J 6.6Hz), 4.10 (2H, br s), 3.64 (1H, dd, J 13. 5,6.4Hz), 3.56 (1H, dd, J 13. 5, 7.0Hz) and 1.95 (3H, t, J 7.1 Hz); m/z (ES+, 70V) 337 (MH+).

INTERMEDIATE 13 <BR> <BR> <BR> <BR> Methvl (2S)-2-amino3-r4- (2, 7-naphthvridin-1-vloxv) phenvllpropanoate A mixture of N- (BOC)- (S)-tyrosine methyl ester (1.71g, 5.80 mmol) potassium carbonate (0.80g, 5.80mmol) and Intermediate 11 (1. 0g, 6.08mmol) in dry DMF (10ml) was stirred at room temperature for 18h, and at 40g for 18h. The DMF was removed in vacuo and the residue partitioned between EtOAc (80ml) and 10% aqueous Na2CO3 (20ml). The phases were separated and the aqueous layer re-extracted with EtOAc (2x20ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford a new colourless oil.

Chromatography (silica ; 2.5% MeOH/DCM) afforded reasonably pure N-t- butoxycarbonyl protected title compound (1.75g, 71%). This material was dissolved in EtOAc (40ml) and HCI gas was bubbled through the stirred solution for 1min. then the mixture was stirred for an additional 0.5h. The volatiles were removed in vacuo affording a yellow solid which was partitioned between EtOAc (80ml) and saturated aqueous NaHCO3 (20ml). The phases were separated and the aqueous layer re-extracted with EtOAc (2x20ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo. The obtained oil

was chromatographed (Si02 ; 5% MeOH/DCM) to afford the title compound as a near colourless oil (0.83g, 62%) #H (CDCI3) 9.77 (1 H, s), 8.75 (1H, d, J 5.8Hz), 8.10 (1H, d, J 5.8Hz), 7.58 (1H, d, J 5.8Hz), 7.29 (2H, d, J 8.4Hz), 7.25 (1H, d, J 5.9Hz), 7.21 (2H, d, J 8.4Hz), 3.80-3.70 (1H, obscured m), 3.72 (3H, s), 3.15 (1H, dd, J 13.6,5. 1Hz), 2.88 (1H, dd, J 13.6,8.0Hz) and 0.78 (2H, br s); m/z (ES+, 70V) 324 (MH+).

INTERMEDIATE 14 4-Acetonyl-3-cyanopyridine A solution of 4-methyl-3-cyanopyridine (4g, 33.9mmol) and N, N- dimethylacetamide dimethylacetal (5.4g, 40.6mmol) in dry DMF (20ml) was stirred at 130-for 7h. The volatiles were removed in vacuo to afford a dark oil which solidified on standing. This material was chromatographed (Si02 ; 50% EtOAc/Hexane-100% EtOAc) affording the title compound as an off-yellow solid (3.73g, 69%). 8H (CDC13) 8.87 (1H, s), 8.74 (1H, d, J 5.2Hz), 7.28 (1H, d, J 5,2Hz), 4.00 (2H, s) and 2.36 (3H, s); m/z (ES+, 70V) 161 (MH+).

INTERMEDIATE 15 1-Hydroxy-3-methyl-2, 7-naphthvridine hvdrochloride HCI gas was bubbled through a stirred solution of Intermediate 14 (3.73g, 23.3mmol) in glacial acetic acid (40moi) for several minutes. The flask was stoppered and reaction stirred for 18h at ambient temperature. The volatiles were removed in vacuo affording a straw-coloured solid. This was twice treated with water (30ml portions) and re-evaporated in vacuo to dryness, affording the title compound (contaminated with #25% unidentified by-product) as a dark straw coloured solid (4.1g). 8H (DMSO- d6) 12.46 (1H, br s), 9.32 (1H, s), 8.71 (1H, d, J 6.5Hz), 7.98 (1H, d, J 6.5Hz), 6.67 (1H, s) and 2.38 (3H, s); m/z (ES+, 70V) 161 (MH+). Used without further purification.

INTERMEDIATE 16 1-Chloro-3-methyl-2, 7-naphthyridine Intermediate 15 (4.1g) was treated with phosphorus oxychloride (50ml) at 130 for 3h, affording a dark solution. The volatiles were removed in vacuo and the obtained dark oil extracted with Et20 (100ml). Saturated aqueous NaHCO3 (ice cold ; containing lOg additional solid NaHCO3) was poured (with CARE!) onto the crude product with swirling and ice-bath cooling.

After thorough shaking, addition Et20 (80ml) was added, the mixture re- shaken, and the phases separated. The aqueous layer was re-extracted with Et20 (2xd80ml) and the combined ethereal extracts washed with brine (20ml), dried (Na2SO4) and evaporated in vacuo to afford an orange solid (3.6g). Chromatography (silica ; 70% EtOAc/Hexane-100% EtOAc) afforded a more-polar by-product (3-methyl-1 H-pyrano [3,4-c] pyridin-1-one, (0.7g) and the title compound as a white solid (2.82g, 79% from intermediate 14) 6H (CDCl3) 9.66 (1H, s), 8.73 (1H, d, J 5.8Hz), 7.56 (1H, d, J 5.8Hz), 7.40 (1H, s) and 2,69 (3H, s); m/z (ES+, 70V) 179 and 181 (MH+).

INTERMEDIATE 17 Ethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-{4-[(3-methyl[2,7- naphthyridin-1-ylamino]phenyl}propanoate hydrochloride Acetylchloride (55mg, 50ml, 0.70mmol) was added to absolute ethanol (25ml) and stirred for one minute. Intermediate 16 (2.50g, 14. 0mmol) and ethyl- (S)-3- [4-aminophenyl]-2- (tert-butyloxycarbonyl] propanoate (4.31 g, 14. Ommol) were added and the reaction mixture stirred at 609 for 2.75h.

The volatiles were removed in vacuo to afford a yellow-orange solid. This was treated with EtOAc (-25ml), warmed, re-cooled and the precipitate collected by filtration, with Et20 washing, affording the title compound as a yellow solid (4.96g, 73%). 8H (CDC13) 10.44 (1 H, br s), 10.33 (1 H, br s),

8.60 (1H, d, J 6.5Hz), 8.00 (1H, d, J 6.5Hz), 7.85 (2H, d, J 8.5Hz), 7.28 (1H, d, J 8. 0Hz), 7.23 (2H, d, J 8.5Hz), 7.16 (1H, s), 4.19-4.01 (1H, m), 4.08 (2H, q, J 7. 0Hz), 2.97 (1H, dd, J 13.8,5.4 Hz), 2.86 (1H, dd, J 13.8, 10.0Hz), 2.50 (3H, s), 1.34 (9H, s) and 1.15 (3H, t, J 7.0Hz); m/z (ES+, 70V) 451 (MH+).

INTERMEDIATE 18 Ethvl-(2S)-2-amino-3-f4-r (3-methvlf2, 71naphthyridin-1-vl) aminol phenyl}propanoate HCI gas was bubbled through a stirred solution of Intermediate 17 (4.95g, 10.2mmol) for 1-2min. After 30min stirring at ambient temperature the volatiles were removed in vacuo affording a yellow powder. This was treated with saturated aqueous NaHCO3 (30ml) then extracted with EtOAc (100ml, and 3x50ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo affording the title compound as a yellow solid (3.56,100%). 8H (CDCl3) 9.25 (1H, s), 8.50 (1H, d, J 5.6Hz), 7.66 (2H, d, J 8.4Hz), 7.35 (1H, d, J 5.6Hz), 7.34 (1H, masked s), 7.14 (2H, d, J 8.4Hz), 6.81 (1H, s), 4.12 (2H, q, J 7. 2Hz), 3.65 (1H, dd, J 7.8,5.2Hz), 3.02 (1H, dd, J 13.7,5.2Hz), 2.80 (1H, dd, J 13.7,7.8Hz), 2.48 (3H, s), 1.56 (2H, br s) and 1.21 (3H, t, J 7.2Hz); m/z (ES+, 70V) 351 (MH+).

INTERMEDIATE 19 Ethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-{4-[ (3- methvlf2, 71naphthvridin-1-vl) oxvlphenyllpropanoate A mixture of N-t-butyloxycarbonyl- (S)-tyrosine ethyl ester (14.5g, 46.9mmol), caesium carbonate (14.05g, 43. 1mmol) and Intermediate 9 (7. 0g, 39.2mmol) in dry DMF (60ml) was stirred at room temperature for 48h. The reaction was diluted with Et20 (150moi) and filtered off. The filtrate was evaporated under high vacuum and the residue was chromatographed (Si02 ; 40%-60% EtOAc/Hexane) which afforded the

title compound as a viscous, straw-coloured oil (16.2g, 77%) 8H (CDC13) 9.56 (1H, s), 8.58 (1H, d, J 5.8Hz), 7.39 (1H, d, J 5.8Hz), 7.15-7.10 (4H, m), 7.00 (1H, s), 4.99-4.91 (1H, m), 4.54-4.46 (1H, m), 4.09 (2H, q, J 7. 1Hz), 3.10-2.99 (2H, m), 2.36 (3H, s), 1.34 (9H, s) and 1.15 (3H, t, J 7.1 Hz); m/z (ES+, 70V) 452 (MH+).

INTERMEDIATE 20 Ethyl (2S)-2-amino-3-{4-[(3-methyl[2,7]naphthyridin-1-yl)oxy]pheny l} propanoate HCI gas was bubbled through a stirred solution of Intermediate 19 (16g) in EtOAc (300ml) until a persistent fine white precipitate formed (-2minutes).

After stirring for 0.5h the volatiles were removed in vacuo. The obtained solid was partitioned between EtOAc (250ml) and saturated aqueous NaHCO3 (80ml plus 5g solid NaHC03). The phases were separated and the aqueous layer re-extracted with EtOAc (5x50ml). The combined organic extracts were washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford an oil. Chromatography (Si02 ; 100% EtOAC-10% EtOH/EtOAc) afforded the title compound as a viscous oil (11.1g, 89%). 8H (CDC13) 9.71 (1H, s), 8.70 (1H, d, J 5. Hz), 7.50 (1H, d, J 5.8Hz), 7.31-7.28 (4H, m), 7.11 (1H, s), 4.23 (2H, q, J 7.1 Hz), 3.79-3.72 (1H, m), 3.14 (1H, dd, J 14.1,5.4Hz), 2.94 (1H, dd, J 14.1,7.8Hz), 2.47 (3H, s), 1.75-1.50 (2H, br s) and 1.30 (3H, t, J 7.1 Hz); m/z (ES+, 70V) 352 (MH+).

INTERMEDIATE 21 1-Chloro-2, 6-naphthyridine 1-Hydroxy-2,6-naphthyridine (550mg) [prepared according to the method of Sakamoto, T. et al Chem. Pharm. Bull. 33,626, (1985)] was stirred with phosphorous oxychloride (10ml) at 110-for 5h. The volatiles were removed in vacuo and the residue treated carefully with ice. After diluting

with water (to-25ml), solid NaHC03 was added to effect neutralisation and the product extracted into EtOAc (2x80ml). The combined organic extracts were dried (MgS04), evaporated in vacuo, and the crude product chromatographed (Si02 ; EtOAc) affording the title compound as a slightly yellow solid (420mg, 68%). 8H (CDCl3) 9.35 (1 H, s), 8.82 (1 H, d, J 5.9Hz), 8.48 (1H, d, J 5.6Hz), 8.00 (1H, d, J 5.9Hz), 7.74 (1H, d, J 5.6Hz); m/z (ES+, 70V) 165 and 167 (MH+).

INTERMEDIATE 22 Ethvl (2S)-2-[(tert-butoxycarbonyl)amino]3-[4-([2,6]naphthyridin-1 - vlamino) phenyllpropanoate Ethyl (S)-3- (4-aminophenyl)-2- [N- (t-butyloxycarbonyl) amino] propanoate (600mg, 1.95mmol), Intermediate 21 (350mg, 2.13mmol) and DIPEA (276mg, 372µl, 2.13mmol) in 2-ethoxyethanol (0.5moi) were stirred at 130g under N2 for several hours. The reaction was partitioned between EtOAc (70ml) and saturated aqueous NaHCO3 (30ml). The phases were separated and the aqueous layer re-extracted with EtOAc (3x30ml). The combined organic extracts were washed with brine (10ml), dried (MgS04) and evaporated in vacuo to afford a dark oil. Chromatography (Si02 ; 3% MeOH/DCM) gave the title compound as a dull orange foam (360mg, 42%). 8H (cDCl3) 9.19 (1H, s), 8.67 (1H, d, J 5.9Hz), 8.24 (1H, d, J 5.8Hz), 7.66 (1 H, d, J 5.9Hz), 7.65 (2H, d, J 8.5Hz), 7.21 (1 H, d, J 5.8Hz), 7.16 (2H, d, J 8. 5Hz), 7.15 (1H, obscured s), 5.05-4.97 (1H, m), 4.60-4.51 (1H, m), 4.19 (2H, q, J 7.1Hz), 3.17-3.04 (2H, m), 1.44 (9H, s), 1.27 (3H, t, J 7. 1 Hz) ; m/z (ES+, 70V) 459 (MNa+), 437 (MH+).

INTERMEDIATE 23 Ethyl (2S)-2-amino-3-[4-([2,6]naphthyridin-1-ylamino)phenyl] propanoate

Intermediate 22 (360mg) was treated with a solution of trifluoroacetic acid (10ml) and DCM (10ml) and stirred at RT for 2h. The volatiles were removed in vacuo and the residue was partitioned between EtOAc (80moi) and saturated aqueous NaHCO3 (30ml). The phases were separated and the aqueous layer re-extracted with EtOAc (3x30ml). The combined organic extracts were dried (MgS04) and evaporated in vacuo to afford the title compound as a dark orange viscous oil (280mg, 100%). 8H (CDCl3) 9.18 (1H, s), 8.66 (1H, d, J 5.9Hz), 8.22 (1H, d, J 5.8Hz), 7.67 (1H, d, J 5.9Hz), 7.64 (2H, d, J 8.5Hz), 7.22 (2H, d, J 8.5Hz), 7.19 (1H, d, J 5.8Hz), 4.20 (2H, q, J 7.1Hz), 3.73 (1H, dd, J 7.9,5.1 Hz), 3.10 (1H, dd, J 13.6,5.2Hz), 2.87 (1H, dd, J 13.6,7.9Hz), 1.70 (3H, br s), 1.28 (3H, t, 7.1 Hz); m/z (ES+, 70V) 337 (MH+).

INTERMEDIATE 24 Methyl (2S)-2- (t-butoxvcarbonvl) aminol-3-f4- (f2, 61naphthvridin-1- vloxv) phenvllpropanoate To N-(t-butyloxycarbonyl)-(S)-tyrosine methyl ester (1.42g, 4.82mmol) in dry DMF (10ml) was added Intermediate 21 (0.79g, 4.82mmol) and cesium carbonate (1.65g, 5.06 mmol) and the reaction stirred at 45~ under N2 for 2 days. The DMF was evaporated, EtOAc added and washed (3x) with water, dried (MgSO4), and evaporated in vacuo. The residue was chromatographed (Si02 ; 40 to 100% EtOAc/isohexane) to afford the title compound as white foam (1.61 g, 82%). 8H (CDCl3) 9.29 (1 H, s), 8.76 (1 H, d, J 5.74Hz), 8.17 (1 H, d, J 5.74Hz), 8.11 (1H, d, J 5.8Hz), 7.43 (1H, d, J 5.8Hz), 7.22-7.18 (3H, m), 5.03 (1H, br s), 4.61 (1H, br s), 3.75 (3H, s), 3.15-3.05 (2H, m), 1.44 (9H, s); m/z (ES+, 70V) MH+ 424.

INTERMEDIATE 25 3, 5-Dichloropvridine-4-carboxvlic acid

A solution of 3,5-dichloropyridine (5.00g, 33.8mmol) in THF (25ml) was added to a solution of LDA [generated from nBuLi (2.5M solution in hexanes, 14. 9ml, 37.2mmol) and diisopropylamine (4.10g, 5. 7ml, 40.6mmol)] in THF (25ml) at-78 under nitrogen, to give a yellow/brown slurry. The reaction was stirred for 30min at-78 then C02 gas was bubbled through to give a clear brown solution that slowly gave a precipitate, warmed to RT over 2h, then quenched with water (20ml) and partitioned between Et20 (100ml) and 1M NaOH (100ml). The aqueous layer was separated and acidified to pH 1 with concentrated hydrochloric acid and then extracted with 10% MeOH in DCM (100mix3). The combined organic layers were dried (MgS04) and the solvent removed under vacuum to give a brown solid that was recrystallised from ethanol and dried under vacuum to give the title compound as pinkish crystals (2.63g, 41%). #H (DMSO-d6) 8.74 (2H, s). 8C (DMSO-d6) 163.5,147.7, 141.0,126.7.

INTERMEDIATE 26 Ethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-{4-[(3,5- dichloroisonicotinovl) aminolphenvlpropanoate A slurry of the compound of Intermediate 25 (51.2g, 0.267mol) in DCM (195mut) and thionyl chloride (195ml, 2.67mol) was treated with DMF (5 drops) and heated to reflux for 4h. The reaction was concentrated in vacuo and azeotroped with toluene (2x50ml) to give a yellow solid which was used without further purification. A solution of ethyl- (S)-3- (4- aminophenyl)-2- (t-butoxycarbonyl amino) propionate (130.8g, 0. 425mol) in DCM (800ml) was cooled to 0 and treated with NMM (56. 0ml, 0. 51mol), stirred for 5 minutes and then a solution of the acid chloride (98.3g, 0.468mol) in DCM (200moi) was added dropwise keeping the reaction temperature below 5°. The reaction was stirred for 1h, quenched with NaHCO3 solution (500ml), the organic layer separated, washed with

NaHCO3 solution (500ml), 10% citric acid solution (500ml) and NaHCO3 solution (500ml), dried (MgS04) and concentrated in vacuo to give a yellow solid which was recrystallised (EtOAc/hexane) to give the title compound, (140g, 69%). 8H (DMSO d6), 8.8 (2H, s), 7.55 (2H, d, J 8.5Hz), 7.23 (2H, d, J 8.5Hz), 4.0 (3H, m), 3.4 (2H, b s), 2.9 (1H, m), 2.8 (1 H, m), 1.3 (9H, s), 1.25 (3H, t); m/z (ES+, 70V) 504 (MNa+).

INTERMEDIATE 27 Ethyl (2S)-2-amino-3-f4-f (3, 5-dichloroisonicotinovl) aminol ohenvlTPropanoate hydrochloride A solution of the compound of Intermediate 26 (70g, 0. 146mol) in EtOAc (500ml) and 1,4-dioxan (50ml) was treated with a solution of HCI in EtOAc (500ml, 3M), and stirred at room temperature for 4h. The reaction was concentrated in vacuo to give a yellow solid which was triturated with Et20 then recrystallised (EtOAc/hexane) to give the title compound (59.3g, 92%). 8H (DMSO d6), 11.10 (1H, s), 8.70 (2H, s), 7.55 (2H, d, J 8.4Hz), 7.25 (2H, d, J 8. 4Hz), 4.10 (3H, m), 3.10 (2H, m), 1.10 (3H, m); m/z (ES+, 70V) 382 (MH+).

INTERMEDIATE 28 3-Ethoxy-7-oxaspiro[3. 51non-2-en-1-one Tetrahydropyranyl-4-carboxylic acid (14.7g, 0. 11mol) and DMF (0. 5ml) in DCM (150ml) was treated dropwise with oxalyl chloride (1. 1eq, 10. 9ml, 0.12mol). After 1 h the reaction mixture was concentrated in vacuo and the residual slurry was diluted with Et20 (200ml) and the resulting precipitate removed by filtration. The filtrate was treated with ethoxyacetylene (40% w/w solution in hexanes, 1. 3eq, 18ml) followed dropwise with triethylamine (25ml, 0.19mol) and the reaction stirred for 11d. Filtration and concentration of the filtrate in vacuo followed by chromatography (Si02, 5: 1 EtOAc: hexanes) gave the title compound as a pale yellow oil

(12.1g, 59%). 8H (CDC13, 300K) 4.85 (1H, s), 4.23 (2H, q, J 7.1Hz), 3.89- 3.75 (4H, m), 1.88-1.79 (4H, m), 1.47 (3H, t, J 7. 1Hz) ; m/z (ES+, 70V) 182.9 (MH+).

INTERMEDIATE 29 7-Oxaspirof3. 51nonane-1,3-dione Intermediate 28 (12.1g, 0. 67mol) and 2M hydrochloric acid (26moi) were stirred vigorously for 24h at room temperature. The resulting solution was concentrated to dryness and the residual slurry was washed with Et20 (25ml) to give the title compound as an off-white powder (8.93g, 0.062mol). aH (DMSO d6,300K) 4.80 (2H, s), 3.78 (4H, t, J 5.5Hz), 2.62 (4H t J 5.5Hz); m/z (ES+, 70V) 154.9 (MH+).

INTERMEDIATE 30 3-Ethoxvspiror3. 61decan-1-one.

A solution of cycloheptyl carbonyl chloride (10.0g, 0.062mol) and ethoxyacetylene (40% w/w solution in hexanes, 6. 0g, 0.083mol, 12ml) in diethylether (50ml) was treated dropwise with triethylamine (20ml, 0. 14mol) and the reaction stirred for 5d at room temperature. Filtration and concentration of the filtrate in vacuo followed by chromatography (Si02, 5: 1 EtOAc: hexanes) gave the title compound as a pale yellow oil (10.5g, 0.054mol, 87%). 8H (CDCl3, 300K) 4.78 (1H, s), 4.20 (2H, q J 7. 1Hz), 1.94-1.87 (2H, m), 1.83-1.77 (2H, m), 1.71-1.66 (2H, m), 1.63-1.52 (6H, m), 1.45 (3H, t J 7. 1 Hz) ; m/z (ES+, 70V) 194.9 (MH+).

INTERMEDIATE 31 Spirof3. 61decane-1, 3-dione Intermediate 30 (8.5g, 0. 044mol) and 2M hydrochloric acid (30ml) was stirred vigorously for 24h at room temperature. The resulting slurry was extracted with EtOAc (3x100ml), the extracts combined and concentrated

in vacuo, and the resulting solid was recrystallised from diethyl ether to give the title compound as an off-white powder (7.1g, 0.043mol, 95%). 8H (DMSO d6,300K) 4.58 (2H, s), 1.75-1.29 (12H, m); m/z (ES+, 70V) 166.9 (MH+).

INTERMEDIATE 32 7-Acetyl-3-ethoxy-7-azaspi rof3. 51non-2-en-1-one.

A solution of 1-acetyl piperidine-4-carbonyl chloride (5.0g, 26.4mmol) and ethoxyacetylene (4.0g, 55.5mmol) in THF (60ml) was treated dropwise with triethylamine (7. 6ml, 55. 0mmol). The resulting slurry was stirred at room temperature for 5d prior to filtration and concentration of the filtrate in vacuo. Chromatography (Si02, 100% EtOAc to 95: 5 EtOAc: MeOH) gave the title compound as a white powder (3.97g, 17.8mmol, 67%). 8H (CDCI3, 300K) 4.79 (1H, s), 4.17 (2H, q, J 7. 1Hz), 3.87-3.81 (1H, m), 3.56-3.42 (3H, m), 2.02 (3H, s), 1.85-1.67 (4H, m), 1.39 (3H, t, J 7.1 Hz); m/z (ES+, 70V) 223.9 (MH+).

INTERMEDIATE 33 7-Acetyl-7-azaspirof3. 51nonane-1,3-dione Intermediate 32 (700mg, 0.31 mmol) and hydrochloric acid (2M, 5ml) were stirred at room temperature for 4h. Concentration of the resulting straw- coloured solution in vacuo gave the title compound as a pale brown water- soluble powder (535mg, 0.027mol, 87%). m/z (ES+, 70V) 195.9 (MH+).

INTERMEDIATE 34 3-Ethoxy-7-methoxyspiror3. 51non-2-en-1-one Was prepared from 4-methoxy cyclohexanecarbonyl chloride (10g, 52.1mmol) and ethoxyacetylene (7.5g, 0. 10mol) according to the method of Intermediate 1 to give the title compound as an approx. 1: 1 mixture of isomers, as a pale yellow oil (7.2g, 34.4mmol, 65%). 8H (CDC13, 300K) 4.81-4.79 (1H, s), 4.22-4.20 (2H q, J 7.1Hz), 3.34-3.32 (3H, s), 3.31-3.22

(1H, m), 2.04-1.56 (8H, m), 1.44-1.43 (3H t, J 7.1 Hz); m/z (ES+, 70V) 211.0 (MH+).

INTERMEDIATE 35 7-Methoxvspiror3. 51nonane-1, 3-dione Intermediate 34 (5.0g, 23.9mmol) and hydrochloric acid (2M, 20ml) were stirred at room temperature for 18h. The resulting slurry was then diluted with water (50ml) and extracted with EtOAc (3x25ml), the extracts were dried (MgS04), filtered, and concentrated in vacuo. Recrystallisation from diethylether gave the title compound as an off-white powder (4.06g, 22.4mmol, 94%). 8H (CDCl3, 300K) 3.81 (2H, s), 3.25 (4H, m) 1.96-1.90 (2H, m), 1.86-1.79 (2H, m), 1.73-1.66 (2H, m), 1.64-1.56 (2H, m); m/z (ES+, 70V) 182.9 (MH+).

INTERMEDIATE 36 Ethyl (2S)-2-amino-3-hydroxypropanoate hydrochloride A mixture of (2S)-2-amino-3-hydroxypropanoate (25g, 238mmol) and acetyl chloride (34ml, 476mmol) in absolute ethanol (250ml) was stirred at 50° for 18hr. The volatiles were removed in vacuo until the volume was reduced to #100ml. Upon cooling the resultant precipitate was collected, washed with ether and hexane to give the title compound as a white powder (26.3g, 65 %). 8H NMR (DMSO d6) 8.47 (3H, br s), 5.58 (1 H, dd), 4.20 (2H, q), 4.08 (1 H, t), 3.81 (2H, dd), 1.23 (3H, t).

INTERMEDIATE 37 Ethvl (2S)-2- (tert-butoxvcarbonvl) aminol-3-hydroxvpropanoate Di-tert-butyl dicarbonate (10. 26g, 47mmol) was added to a stirred mixture of Intermediate 36 (7.98g, 47mmol) and NaHCO3 (8.70g, 2.2equiv.) in dioxan/water (1: 1) (80ml) and stirred for 4.5hr. The bulk of the solvent was removed in vacuo and the resultant slurry was treated with EtOAc (150ml).

The inorganics were removed by filtration with EtOAc. The filtrate was

washed with 10% aq citric acid (30MI), water (30ml), saturated aq.

NaHCO3 (20moi) and brine (20ml) and dried (Na2SO4) and evaporared in vacuo to afford the title compound as a colourless oil (10.3g, 94%). 8H (CDC13) 5.45 (1H, br), 4.36 (1H, br), 4.26 (2H, q), 3.94 (2H, br m), 1.47 (9H, s), 1.28 (3H, t); m/z (ES+, 70V) 233 (MH+), 256 (MNa+).

INTERMEDIATE 38 <BR> <BR> <BR> <BR> Ethvl (2S)-2-[(tert-butoxvcarbonvl) ami nol-3-<BR> <BR> <BR> <BR> <BR> [ (methylsulfonvl) oxvlpropanoate Methanesulphonyl chloride (730µL, 9.43mmol) was added to a stirred, ice- bath cooled solution of Intermediate 37 (2. 0g, 8.5mmol) and 4- methylmorpholine (1. 13ml, 10.29mmol) in dry DCM (30ml) and stirred for 6hr. The solvent was removed in vacuo and the residue treated with EtOAc (150ml). The organics were washed with water (40ml), 10% aq citric acid (20ml), water (20ml), sat aq NaHCO3 (20ml), water (20ml), brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford a colourless glass which solidified on standing. This was treated with hexane and the solid was filtered, washed with hexane and dried under N2 atmosphere to give the title compound (2.45g, 92 %). AH (CDC13), 5.38 (1 H, br), 4.63 (3H, br m), 4.27 (2H, q), 3.03 (3H, s), 1.48 (9H, s), 1.33 (3H, t); m/z (ES+, 70V) 333 (MNa+).

INTERMEDIATE 39 Ethyl (2R)-2-[(tert-butoxycarbonyl)amino]-3-iodopropanoate Intermediate 38 (1.0g, 3.21mmol) was stirred in acetone (10ml) in a foil covered flask with sodium iodide (723mg, 4.82mmol) at RT for 18 hr. The acetone was removed in vacuo and the residue partitioned between EtOAc (100ml) and water (30ml). The organics washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo to afford a yellow oil. This was purified by chromatography (Si02 ; 30% Et20/hexane) to afford the title compound as a colourless oil which solidified to a white solid (597mg,

54%). 8H (CDC13) 5.36 (1H, br), 4.50 (1H, br m), 4.27 (3H, m), 3.59 (2H, m), 1.48 (9H, s), 1.33 (3H, t); m/z (ES+, 70V) 365 (MNa+).

INTERMEDIATE 40 Ethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-(5-nitropyridin-2-yl) propanoate Zinc dust (100mesh) (581 mg, 8.88mmol) was heated under vacuum and then cooled under N2.1,2-dibromoethane (321lu, 0.37mmol) and dry THF (1 ml) were added with heating to boiling. Heating was stopped and the mixture stirred for 1 min. This heating and stirring was repeated twice more. TMSCI ! (66 ; iL, 0.52mmol) was added and stirred at 50° for-10 mins. Intermediate 39. (2.54g, 7.40mmol) in dry THF (4ml) was added and stirred at-35-40° for 40 minutes. 2-bromo-5-nitropyridine (1.50g, 7.30mmol) and PdCl2 (PPh3) 2 (260mg, 0.37mmol) and dry THF (2ml) were added and the reaction mixture stirred at 35° for 2hr. The reaction mixture was partitioned between EtOAc (150ml) and sat. aq. NH4Cl (40ml). The phases were separated and the aqueous phase re-extracted with EtOAc (50ml). The combined organic extracts were washed with brine (10mi), dried (Na2SO4) and evaporated in vacuo to afford a dark straw coloured oil. Purification by chromatography (Si02 ; 30-70% Et20/hexane) afforded the title compound as a yellow oil (1.52g, 61 %). 8H (CDC13), 9.34 (1 H, s), 8.39 (1H, d), 7.38 (1H, d), 5.58 (1H, br), 4.75 (1H, br m), 4.20 (2H, m), 3.47 (2H, m), 1.42 (9H, s), 1.23 (3H, t); m/z (ES+, 70V) 339 (MH+).

INTERMEDIATE 41 Ethyl (2S)-3- (5-aminopvridin-2-yl)-2-r (tert butoxvcarbonvl) aminolpropanoate A stirred solution of Intermediate 40 (1.16g, 3.42mmol) in absolute EtOH (20moi) was hydrogenated at atmospheric pressure with 10% Pd on charcoal (100mg) for 3.5hrs. The catalyst was removed by filtration through a celite pad with DCM. The filtrate was evaporated in vacuo. The

crude title compound was obtained as a straw-coloured oil (1.03g, 98%) and used without further purification. 8H (CDC13), 8.01 (1H, s), 6.92 (2H, s), 5.83 (1H, br), 4.59 (1H, br m), 4.13 (2H, m), 3.63 (2H, br), 3.15 (2H, br), 1.43 (9H, s), 1.21 (3H, t); m/z (ES+, 70V) 309 (MH+).

INTERMEDIATE 42 Ethvl (2S)-2-[ tert-butoxvcarbonvl) aminol-3-f5-r (3, 5- dichloroisonicotinovl) aminolpvridin-2-vllpropanoate.

3,5-Dichloroisonicotinoyl chloride (0.51 ml, 3.61 mmol) was added to a stirred, ice-bath cooled solution of Intermediate 41 (1.06g, 3.43mmol) and dry pyridine (0. 55ml) in dry DCM (20ml) and stirred at RT for 1 hr. After evaporation of the solvent the residue was dissolved in EtOAc (80ml) and washed with satuarted sodium bicarbonate (20-ml), water (10ml), brine (10ml), then dried (Na2SO4) filtered and concentrated in vacuo to a red- brown glass. Chromatography (silica, 75% Et20/DCM) afforded a the title compound as tan-coloured solid (1.25g, 75%). 8H NMR (DMSO d6) 8.69 (2H, s), 8.58 (1 H, s), 7.92 (1 H, d), 7.20 (1 H, d), 4.26 (1 H, m), 3.97 (2H, m), 2.93 (2H, m), 1.21 (9H, s), 1.01 (3H, t); m/z (ES+, 70V) 483 (MH+).

INTERMEDIATE 43 Ethvl (2S)-2-amino-3-f5-r (3,5-dichloroisonicotinovl) aminolpvridin-2- vl propanoate Acetyl chloride (6ml) was added to absolute EtOH (20ml) and stirred for 15 min., cooled to RT, then Intermediate 42 (2.74g, 5.67mmol) added with and stirring for 3.5hrs. The solvent removed in vacuo. The resultant yellow residue was treated with sat. sodium bicarbonate (10ml) and solid sodium bicarbonate till neutralised. Extraction with EtOAc (4 x 50 ml), drying (Na2SO4) and concentrated affordet the title compound as a straw- coloured foam (2.1 g, 97%). 8H NMR (d6 DMSO) 8.67 (2H, s), 8.56 (1H, s), 7.85 (1H, d), 7.16 (1H, d), 3.89 (2H, q), 3.57 (1H, dd), 2.86 (1H, dd), 2.82 (1 H, dd), 1.73 (2H, br), 1.00 (3H, t). m/z (ES+, 70V) 383 (MH+).

INTERMEDIATE 44 3-Ethoxv-7, 7-dioxo-7X6-thia-spiror3. 51non-2-en-1-one A solution of 1,1-dioxo-hexahydro-1 X6-thiopyran-4-carboxylic acid (10.2g, 57.3mmol) [Prepared according to the procedure of [Org. Prep. Proc. Int.

1977, 94] and DMF (0. 3ml) in DCM (120mut) at rt, was treated dropwise with oxalyl chloride and the resulting slurry stirred for 3d. The crude reaction was then concentrated in vacuo to give an oil which was redissolved in THF (100moi), treated with ethoxyacetylene (10ml, 50% w/w) and triethylamine (10mol) and the resulting slurry stirred for 10d at rt.

Filtration and concentration of the filtrate in vacuo gave a crude oil which was purified by chromatography (Si02, 30% EtOAc: hexanes) to give the title compound as a yellow oil (8.9g, 38.6mmol, 67%). 8H (CDCl3, 300K) 4.88 (1H, s), 4.27 (2H, q, J 7.1 Hz), 3.44-3.37 (2H, m), 3.13-3.05 (2H, m), 2.47-2.40 (2H, m), 2.35-2.29 (2H, m), 1.48 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 230.9 (MH+).

INTERMEDIATE 45 3-Hydroxy-7, 7-dioxo-7#6-thia-spiro[3. 51non-2-en-1-one Intermediate 44 (8.6g, 37.4mmol) was stirred with 1M HCI (100ml) for 3d and the resulting solution concentrated in vacuo. The residual solid was triturated with EtOAc to give the title compound as an off-white solid (5.1g, 25.2mmol, 68%). m/z (ES+, 70V) 202.9 (MH+).

INTERMEDIATE 46 3-Ethoxv-spirof3. 41octa-2, 6-dien-1-one A solution of cyclopent-3-ene carboxylic acid (4.0g, 36. 0mmol) and DMF (0. 25ml) in DCM (30ml) at 0° was treated dropwise with oxalyl chloride (3. 5ml), 39. 0mmol;). After 2h the reaction mixture was concentrated in vacuo, the residual slurry diluted with Et20 (100mlo) and the resulting precipitate removed by filtration and the filtrate concentrated in vacuo. The

resulting oil was diluted with Et20 (50ml), treated with ethoxyacetylene (40% w/w solution in hexanes, 10ml) followed dropwise with triethylamine (6ml, 44. 0mmol) and the reaction stirred for 7d. Filtration and concentration of the filtrate in vacuo followed by chromatography (Si02, 5: 1 EtOAc: hexanes) gave the title compound as a pale yellow oil (4.3g, 73%). m/z (ES+, 70V) 164.9 (MH+).

INTERMEDIATE 47 3-Hvdroxv-spirof3. 41octa-2, 6-dien-1-one Intermediate 46 (2.0g, 12. Ommol) and 2M hydrochloric acid (5ml) were stirred vigorously for 24h at room temperature. The resulting solution was extracted with EtOAc (25ml), the extracts dried (MgS04), filtered and concentrated in vacuo to give the title compound as an pale brown powder (1.07g, 7.9mmol, 65%). 8H (DMSO d6,300K) 5.54 (4H, s), 4.57 (2H, s), 2.52 (2H, s). m/z (ES+, 70V) 136.9 (MH+).

INTERMEDIATE 48 (+,-)-3-Ethoxy-4-methyl-4-phenyl-cyclobut-2-enone A solution of (+,-) 2-phenylpropionic acid (10. 0g, 0.66mmol) and DMF (0.3moi) in DCM (150ml) was treated dropwise with oxalyl chloride (6.4ml, 0.72mmol). After 1 h the reaction mixture was concentrated in vacuo, the residual slurry diluted with Et20 (200ml) and the resulting precipitate removed by filtration. The filtrate was treated with ethoxyacetylene (40% w/w solution in hexanes, 18m followed dropwise with triethylamine (25ml, 0.19mol) and the reaction stirred for 7d at rt. Filtration and concentration of the filtrate in vacuo followed by chromatography (Si02, 5: 1 EtOAc: hexanes) gave the title compound as a pale yellow oil (6.1g, 45%). 8H (CDC13, 300K) 7.45-7.24 (5H, m), 5.01 (1H, s), 4.31 (2H, J 7.1 Hz), 1.67 (3H, s), 1.51 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 202.9 (MH+).

INTERMEDIATE 49 (+,-)-3-Hvdroxv-4-methvl-4-phenvl-cvclobut-2-enone Intermediate 48 (4.5g, 22.2mmol) was hydrolyse according to the method of Intermediate 29 to give the title compound as an off-white powder (3.29g, 18.9mmol, 85%); 8H (CDCI3, 300K) 7.53-7. 21 (5H, m), 4.04 (1H, d, J 21.7Hz), 3.93 (1H, d, J 21.7Hz), 1.62 (3H, s). m/z (ES+, 70V) 174.9 (MH+).

INTERMEDIATE 50 Cvclohexvlethvnvloxy-triisopropvl-silane Prepared according to the method of Kowalski, Sankar Lal and Haque, JACS, 1986,108,7127-7128.

INTERMEDIATE 51 2-Cvclohexvl-3-triisopropvlsilanyloxy-spirof3. 51non-2-en-1-one ; To a stirred solution of the compound of example 89 (5.6g, 20 mmol) in t- butylmethyl ether (50ml) was added cyclohexylcarbonyl chloride (5.3moi, 40 mmol) and triethylamine (13 ml, 100mol). The mixture was stirred under reflux for 24 hours, allowed to cool and filtered to remove triethylammonium chloride. The filtrate was concentrated under reduced pressure and chromatographed on silica gel, mobile phase 3% EtOAc in hexane to afford the title compound as a brown oil (5.8g, 74%). m/z (ES+, 70V) 235.2 (MH+ of desilylated compound).

INTERMEDIATE 52 2-Cyclohexvl-spirof3. 51nonane-1 3-dione Intermediate 51 was stirred with 5 volumes of 2M hydrochloric acid for 14 days and worked up in a similar manner to Intermediate 4 to afford the title compound as a white crystalline solid in 40% yield. m/z (ES+, 70V) 235.0 (MH+).

INTERMEDIATE 53 1-Butoxvprop-1-vne Prepared according to the method of Nooi and Arens; Recl. Trav. Chim.

Pays-Bas; 78; 1959; 284-287.

INTERMEDIATE 54 1-Butoxybut-1-yne Prepared in a similar manner to Intermediate 53 from the appropriate starting materials.

INTERMEDIATE 55 1-Butoxypent-1-vne Prepared in a similar manner to Intermediate 53 from the appropriate starting materials.

INTERMEDIATE 56 3-Butoxy-2, 4, 4-trimethyl-cvclobut-2-enone Prepared in a similar manner to Intermediate 1 from Intermediate 53 in 45% yield. 6H NMR (d CHCl3) 4.35 (2H, t, J 6.5Hz), 1.79 (2H, m), 1.66 (3H, s), 1.50 (2H, m), 1.22 (6H, s), 0.99 (3H, t, J 7.4Hz). m/z (ES+, 70V) 183.0 (MH+) INTERMEDIATE 57 3-Butoxy-2-ethvl-4, 4-dimethyl-cyclobut-2-enone Prepared in a similar manner to Intermediate 1 from Intermediate 54 in 56% yield. 8H NMR (d CHCl3) 4.31 (2H, t, J 6.5Hz), 2.07 (2H, q, J 7.6Hz), 1.80 (2H, m), 1.52 (2H, m), 1.23 (6H, s), 1.10 (3H, t, J 7.6Hz), 1.00 (3H, t, J 7.3Hz). m/z (ES+, 70V) 197.0 (MH+).

INTERMEDIATE 58 3-Butoxv-4, 4-dimethyl-2-propvl-cyclobut-2-enone

Prepared in a similar manner to Intermediate 1 from Intermediate 55 in 51 % yield. 8H NMR (d CHCl3) 4.30 (2H, t, J 6.5Hz), 2.04 (2H, q, J 7.4Hz), 1.75 (2H, m), 1.50 (4H, m), 1.23 (6H, s), 1.00 (3H, t, J 7.4Hz), 0.92 (3H, t, J 7.4Hz). m/z (ES+, 70V) 211.0 (MH+).

INTERMEDIATE 59 2, 2, 4-Trimethvl-cvclobutane-1, 3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 56 in 85% yield. 8H (d6 DMSO) 1.36 (3H, s), 1.07 (6H, s). m/z (ES+, 70V) 126.9 (MH+).

INTERMEDIATE 60 4-Ethyl-2, 2-dimethvl-cvclobutane-1, 3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 57 in 70% yield. 8H (d6 DMSO) 1.85 (2H, q, J 7.6Hz), 1.07 (6H, s), 0.95 (3H, t, J 7.6Hz). m/z (ES+, 70V) 140.9 (MH+).

INTERMEDIATE 61 2, 2-Dimethyl-4-propyl-cvclobutane-1, 3-dione<p> Prepared in a similar manner to Intermediate 2 from Intermediate 58 in 64% yield. 8H (CDC13) 1.96 (2H, t, J 7.3 Hz), 1.50 (2H, m), 1.28 (6H, s), 0.90 (3H, t, J 7.3Hz). m/z (ES+, 70V) 154.9 (MH+).

INTERMEDIATE 62 3-Butoxv-2-methyl-spiror3. 51non-2-en-1-one Prepared in a similar manner to Intermediate 1 from Intermediate 53 in 23% yield. 8H (CDCl3) 4.34 (2H, t, J 6.5Hz), 1.77-1.25 (17H, m), 1.00 (3H, t, J 7.4Hz). m/z (ES+, 70V) 223.0 (MH+) INTERMEDIATE 63 3-Butoxy-2-propyl-spiro[3.5]non-2-en-1-one

Prepared in a similar manner to Intermediate 1 from Intermediate 55 in 67% yield. 8H (CDC13) 4.31 (2H, t, J 6.4Hz), 2.07 (2H, t, J 7.2Hz), 1.80- 1.40 (13H, m), 1.00 (3H, t, J 7.1Hz), 0.93 (3H, t, J 7.3Hz). m/z (ES+, 70V) 251.1 (MH+) INTERMEDIATE 64 2-Methvl-spiror3. 51nonane-1, 3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 62 in 90% yield. 8H (d6 DMSO) 1.56 (10H, m), 1.37 (3H, s). m/z (ES+, 70V) 166.9 (MH+).

INTERMEDIATE 65 2-Propvl-spirof3. 51nonane-1, 3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 63 in 64% yield. 8H (d6 DMSO) 1.82 (2H, t, J 7.2Hz), 1.58 (8H, m), 1.41 (2H, m), 1.39 (2H, q, J 7.4Hz), 0.85 (3H, t, J 7.3Hz). m/z (ES+, 70V) 195.1 (MH+).

INTERMEDIATE 66 3-Butoxv-2-methvl-7-oxa-spirof3. 51non-2-en-1-one Prepared in a similar manner to Intermediate 1 from Intermediate 53 in 48% yield. 8H (CDC13) 4.30 (2H, t, J 6.5Hz), 3.76 (4H, m), 1.70 (6H, m), 1.63 (3H, s), 1.36 (2H, m), 0.92 (3H, t, J 7.4Hz). m/z (ES+, 70V) 225.0 (MH+).

INTERMEDIATE 67 3-Butoxy-2-propvl-7-oxa-spiror3. 51non-2-en-1-one Prepared in a similar manner to Intermediate 1 from Intermediate 55 in 79% yield. 8H (CDC13) 4.33 (2H, t, J 6.4Hz), 3.81 (4H, m), 2.09 (2H, t, J 7.7Hz), 1.81 (6H, m), 1.50 (4H, m), 1.00 (3H, t, J 7.4Hz), 0.94 (3H, t, J 7.3Hz). m/z (ES+, 70V) 253.0 (MH+).

INTERMEDIATE 68 2-Methvl-7-oxa-spirof3. 51nonane-1, 3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 66 in 51% yield. aH NMR (d DMSO) 3.67 (4H, m), 1.68 (4H, m), 1.40 (3H, s). m/z (ES+, 70V) 168.9 (MH+).

INTERMEDIATE 69 2-Propyl-7-oxa-spiro[3. 51nonane-1,3-dione Prepared in a similar manner to Intermediate 2 from Intermediate 67 in 79% yield. m/z (ES+, 70V) 196.9 (MH+).

INTERMEDIATE 70 (3-Ethoxy-prop-2-vnvl)-benzene To a solution of ethoxy acetylene (9.95g of 50% w/w. solution in hexanes, 70mmol) in THF (100ml) at-78° was added n-butyl lithium (31ml of 2.5M solution in hexanes, 78mmol). The mixture was stirred at this temperature for 2h. prior to the addition of HMPA (20ml), stirring was continued for a further 15min. before the addition of benzyl bromide (9. 2ml). The reaction mixture was allowed to warm to room temperature overnight before partitioning between EtOAc (300ml) and water (200ml). The organics were separated, washed with water (5 x 200moi), brine (200ml), dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a mobile brown oil (11.1g, 99%). 8H (300MHz, CDC13) 7.15-7.57 (5H, m), 4.12 (2H, q, J=7. 1Hz), 3.60 (2H, s), 1.41 (3H, t, J=7. 1Hz). m/z (ES+, 70V) MH+ 161.

INTERMEDIATE 71 2-Benzvl-3-ethoxy-4, 4-dimethyl-cyclobut-2-enone To a solution of Intermediate 70 (11 g, 68mmol) in THF (200moi) at room temperature was added isobutyryl chloride (11 ml) and triethylamine (19ml). The mixture was stirred at this temperature for 65h. filtered, partitioned between EtOAc (400moi) and water (200moi), the organics were

separated, washed with brine (200ml), dried (Na2SO4), filtered and concentrated in vacuo. The crude product was purified by column chromatography (Si02 : eluant 3: 2, hexane: diethyl ether) to give the title compound as a viscous clear oil (11. 8g, 75%). 8H (300MHz, CDC13) 7.18- 7.32 (5H, m), 4.27 (2H, q, J=7. 1Hz), 3.43 (2H, s), 1.36 (3H, t, J=7. 1Hz), 1.28 (6H, s). m/z (ESI, 70V) MH+ 231.

INTERMEDIATE 72 4-Benzvl-2, 2-dimethvl-cvclobutane-1, 3-dione Intermediate 71 (11.8g, 51.3mmol) was stirred in HCI (200ml, 6M aq.) at room temperature overnight. The solid precipitate was filtered and washed on the sinter with hexane and diethyl ether to give the title compound as a white powder (9.8g, 95%). 8H (300MHz, d6 DMSO) C7. 13-7.29 (5H, m), 3.20 (2H, s), 1.11 (6H, s). m/z (ESI, 70V). MH+ 213.

INTERMEDIATE 73 4-Bromomethyl-5-methyl-2-oxo-1, 3-dioxolene Prepared according to the method of Sakamoto F., Ikeda S. and Tsukamoto G., Chem. Pharm. Bull., 1984,32,2241-2248.

INTERMEDIATE 74 Ethyl (2S)-2-tert-Butoxvcarbonvlamino-3-f4-r (3,5-dichloro-1-oxy- pvridine-4-carbonvl) aminolphenvl} propanoate Intermediate 26 (500mg, 1.04mmol) and mCPBA (493mg, 2. 0mmol) in DCM (1 Oml) were stirred together at room temperature for 48hrs. After this time sodium sulfite (10% solution in water, 20ml) was added with stirring for 5 mins, prior to separating between DCM (50ml) and sodium bicarbonate solution (50 ml). The organics were washed with sodium bicarbonate solution (2x50ml) and water (1 x50ml), dried (MgS04) and reduced in vacuo. The resulting orange solid was recrystalised from EtOAc/hexane to give title compound as a of pale yellow powder (350mg).

8H (DMSO d6) 7.78 (2H, s), 6.78 (2H, d, J 8.3Hz), 6.46 (2H, d, J 8.4Hz), 3.55 (1H, m), 3.36 (2H, q, J 7.1Hz), 2.31 (1H, dd J 5.8Hz, 13.8Hz), 2.31 (1H, dd, J 13.6,8.9Hz), 0.60 (9H, s), 0.43 (3H, t, 3H).

INTERMEDIATE 75 (S)-2-Amino-3-f4-f (3, 5-dichloro-1-oxv-pvridine-4-carbonyl)-aminol- phenyll-propionic acid ethyl ester Intermediate 74 (330mg, 0.55mmol) and HCI in EtOAc (2.6M) were stirred together at room temperature overnight. After this time the formed precipitate was filtered off, washed with Et20, (3x50ml) and then made basic by separating between EtOAc (50ml) and sodium bicarbonate solution (50ml). The organics were dried (MgSO4) and reduced in vacuo to give title compound as white solid (185mg). 8H (CD30D) 8.40 (2H, s), 7.43 (2H, d, J 8.6Hz), 7.05 (2H, d, J 8.6Hz), 3.98 (2H, q, J 7.1Hz), 2.85 (2H, m), 1.04 (3H, t, J 7. 1 Hz).

EXAMPLE 1 Ethvl (2S)-2-[ (4, 4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-r4- (r2, 71naphthyridin-1-vloxv) phenyllpropanoate A solution of 3-hydroxy-4,4-dimethyl-2-cyclobutenone (57mg, 0. 51mmol) [prepared according to the method of Wasserman, H. H. et al J. Org.

Chem, 38,1451-1455, (1973)] and the ethyl ester prepared according to the method used to prepare Intermediate 13 (164mg, 0. 51mmol), in 1,2- dichloroethylene (5ml), was stirred at room temperature for 72h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) affording the title compound as a white solid (188mg, 0.45mmol, 89%). 8H (CDCl3, 300K) 9.92 (1 H, s), 8.75 (1 H, d, J 5.7Hz), 8.60 (1 H, d, J 8.6Hz), 8.04 (1H, d, J 5.8Hz), 7.82 (1H, d, J 5.6Hz), 7.47 (1H, d, J 5.8Hz), 7.27 (2H, d, J 8.5Hz), 7.16 (2H, d, J 8.5Hz), 4.31 (1H, s), 4.30-4.21 (1H, m), 3.68-3.63 (2H, q, J 7.1Hz), 3.17 (1H, dd, J 13.6,9.4Hz), 2.95 (1H, dd, J 5. 0,13.6Hz), 1.01 (3H, s), 0.93 (3H, s). m/z (ES+, 70V) 418.1 (MH+).

EXAMPLE 2 (2S)-2-f (4, 4-Dimethvl-3-oxo-1-cvclobutenvl) aminol-3-f4- ([27lnaphthvridin-1-vloxv) phenvl1propanoic acid The compound of Example 1 (127mg, 0. 31mmol) in THF (5ml) was treated in a single portion with LiOH. H20 (13mg, 0.32mmol) in H20 (1ml) and the reaction stirred at room temperature for 2h. The reaction was then quenched by the addition of HOAc (glacial, 1 ml) and the volatiles removed in vacuo. Water (10ml) was then added to the residual foam and stirred vigorously to effect precipitation. The precipitate was then collected by vacuum filtration and the residue washed with water (2 x 5ml). Drying under vacuum gave the title compound as a fine white solid (108mg, 0.27mmol, 88%). 8H (DMSO d6,300K) 9.67 (1 H, s), 8.78 (1 H, d, J 5.7Hz), 8.51 (1H, d, J 8.6Hz), 8.09 (1H, d, J 5.8Hz), 7.86 (1H, d, J 5.6Hz), 7.50 (1H, d, J 5.7Hz), 7.21 (2H, d, J 8. 4Hz), 4.17 (2H, d, J 8. 4Hz), 4.34 (1 H, s), 4.18-4.14 (1H, m), 3.21 (1H, dd, J 4.9,13.9Hz), 2.98 (1H, dd, J 13.9, 9.3Hz), 1.06 (3H, s), 0.99 (3H, s). m/z (ES+, 70V) 404.1 (MH+).

EXAMPLE 3 <BR> <BR> <BR> <BR> Ethyl (2S)-2-r (4, 4-dimethyl-3-oxo-1-cvclobutenvl) aminol-3-f4-<BR> <BR> <BR> <BR> <BR> <BR> ([2, 61naphthvridi n-1-ylam i no) phenvilpropanoate A solution of 3-hydroxy-4, 4-dimethyl-2-cyclobutenone (58mg, 5.1 mmol) and Intermediate 23 (1.01g, 2.7mmol) in DCM (15ml), was stirred at room temperature for 48h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) affording the title compound as a white powder (990mg, 2.3mmol, 88%). 8H (CDCl3, 300K) 9.33 (1 H, s), 9.24 (1 H, s), 8.69 (1 H, d, J 5.9Hz), 8.63 (1 H, d, J 8.5Hz), 8.42 (1 H, dd, J 5.9,0.8Hz), 8.15 (1H, dd, J 5.7,1.3Hz), 7.85-7.80 (3H, m), 7.31-7.22 (4H, m), 4.39 (1H, s), 4.24-4.21 (1H, m), 4.17 (2H, q, J 7.1Hz), 3.15 (1H, dd, J 13.8, 5.6Hz), 3.00 (1H, dd, J 13.8,9. 0Hz), 1.19 (3H, t, J 7. 1Hz), 1.11 (3H, s), 1.05 (3H, s). m/z (ES+, 70V) 431.1 (MH+).

EXAMPLE 4 (2S)-2-r (4, 4-dimethvl-3-oxo-1-cvclobutenyl) aminol-3-r4- ([2q6lnaphthvridin-1-vlamino) phenel1propanoic acid The compound of Example 3 (500mg, 1.16mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (421 mg, 1.04mmol, 90%). 8H (DMSO d6,300K) 9.21 (1 H, s), 9.12 (1H, s br), 8.66 (1H, d, J 5.8Hz), 8.38 (1H, d, J 5.8Hz), 8.18 (2H, m), 7.81 (2H, d, J 7.9Hz), 7.27 (2H, d, J 7.9Hz), 7.26 (1H, obscured s), 4.36 (1H, s), 4.13-4.07 (1H, m), 3.20 (1H, dd, J 14.0,5.1 Hz) 3.02 (1H, dd, J 41. 0,8.7Hz), 1.13 (3H, s), 1.09 (3H, s). m/z (ES+, 70V) 403.0 (MH+).

EXAMPLE 5 Ethvl (2S)-2-r (4, 4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-f4-f (3, 5- dichloroisonicotinovl) aminolphenvlTpropanoate A solution of 3-hydroxy-4,4-dimethyl-2-cyclobutenone (58mg, 0.52mmol) [prepared according to the method of Wasserman, H. H. et al J. Org.

Chem, 38,1451-1455, (1973)] and the free base of Intermediate 27 (200mg, 5.2mmol), in DCM (5ml), was stirred at room temperature for 48h.

The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) to give the title compound as a white solid (230mg, 0.48mmol, 93%). 8H (CDCl3, 300K) 8.48 (2H, s), 8.10 (1H, s), 7.51 (2H, d, J 8.2Hz), 7.04 (2H, d, 8.2Hz), 5.91 (1H, s), 4.43 (1H, s), 4.22 (2H, q, J 7.1 Hz), 3.17 (1H, dd, J 14.0,5.1 Hz), 3.05 (1H, dd, J 14.0,5.8Hz), 1.28 (3H, t, J 7. 1Hz), 1.15 (3H, s), 1.14 (3H, s). m/z (ES+, 70V) 476.0 and 478.0 (MH+).

EXAMPLE 6 (2S)-2-f (4, 4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenylTpropanoic acid

The compound of Example 5 (100mg, 0. 21mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (76mg, 0.17mmol, 81%). 8H (DMSO d 6,350K) 10.5 (1H, s), 8.74 (2H, s), 7.80 (1H, broad s), 7.53 (2H, d, J 8.1 Hz), 7.25 (2H, d, J 8.1 Hz), 7.26 (1H, obscured s), 4.30 (1H, s), 3.88 (1H, m), 3.16 (1H, dd, J 13.5,4.9Hz), 3.01 (1H, dd, J 13.5,3.8Hz), 1.11 (3H, s), 1.07 (3H, s). m/z (ES+, 70V) 448.0 and 449.9 (MH+).

EXAMPLE 7 Methyl (2S)-2-r (4R, S)-4-methvl-3-oxo-4-propvl-1-cyclobutenyllamino- 3-f4-f (3-methvlf 2, 71naphthvridin-1-vl) oxvlphenylpropanoate A solution of Intermediate 2 (187mg, 1.33mmol) and Intermediate 20 (450mg, 1. 2mmol), in chloroform (10ml), was stirred at 55° for 48h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) to give the title compound as a white solid (539mg, 1.17mmol, 91%) as an approx. 1: 1 mixture of diastereomers. #H (CDCl3, 300K) 9.69 (1H, s), 8.69 (1H, d, J 5.7Hz), 7.51 (1H, dd, J 9.3,0.5Hz), 7.19-7.11 (4H, m), 5.79 (1H, d, J 7.3Hz), 4.64 (1H, s), 4.36-4.30 (1H, m), 3.84 and 3.82 (3H, s, diastereomeric CH3), 3.31-3.15 (2H, m), 2.45 (3H, s), 1.59-1.54 (1H, m), 1.50-14 (1H, m), 1.34-1.23 (2H, m), 1.28 and 1.27 (3H, s, diastereomeric CH3), 0.91-0.86 (3H, m). m/z (ES+, 70V) 460.1 (MH+).

EXAMPLE 8 (2S)-2-[(4R,S)-4-Methyl-3-oxo-4-propyl-1-cyclobutenyl]amino- 3-{4-[(3- methylf2. 71naphthvridin-1-vl) oxvlphenvllpropanoic acid The compound of Example 7 (230mg, 0.5mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (198mg, 0.44mmol, 79%) as an approx. 1: 1 mixture of diastereomers. 8H (DMSO d6,300K) 13.0 (1H, s), 9.60 (1H, d, J 9.7Hz), 8.72 (1H, d, J 5.6Hz), 8.49-8.43 (1H, m NH), 7.76 (1H, d, J 4.7Hz), 7.41-

7.34 (2H, m), 7.27-7.21 (2H, m), 4.47 and 4.43 (1H, s), 4.19-4.13 (1H, m), 3.29-3.23 (3H, s, and 1H as obscured m), 3.02-2.97 (1H, m), 2.36 and 2.35 (3H, s), 1.50-1.10 (4H, m), 1.08 and 0.98 (3H, s), 0.84-0.63 (3H, m), m/z (ES+, 70V) 446.1 and 447.1 (MH+).

EXAMPLE 9 Ethyl (2S)-2-[ (4,4-diproyl-3-oxo-1-cyclobutenyl)amino]-3-[4- ([2,7]naphthyridin-1yloxy)phenyl]propanoate A solution of Intermediate 4 (180mg, 1.07mmol) and the ethyl ester of Intermediate 13 (362mg, 1.07mmol), in chloroform (7ml), was stirred at room temperature for 96h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) to give the title compound as a white solid (406mg, 0.83mmol, 78%). 6H (CDCl3, 300K) 9.72 (1 H, s), 8.71 (1H, d J 5.7Hz), 8.04 (1H, d, J 5.8Hz), 7.55 (1H, d, J 5.7Hz), 7.22-7.16 (4H, m), 5.67 (1H, d, J 7.9Hz), 4.64 (1H, s), 4.26-4.16 (3H, m), 3.20 (1H, dd, J 14.1,5.7Hz), 3.11 (1H, dd, J 14. 1,6.6Hz), 1.58-1.01 (8H, m), 0.81 (6H, t, J 7.0Hz). m/z (ES+, 70V) 488.1 and 489.1 (MH+).

EXAMPLE 10 (2S)-2-[(3-Oxo-4,4-dipropyl-1-cyclobutenyl)amino]3-[4- (f2, 7]naphthryidin-1-yloxy)phenyl]propanoic acid The compound of Example 9 was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine off-white powder (35mg, 0.07mmol, 19%). bCH (DMSO d6,350K) 9.68 (1H, s), 8.83 (1H, d, J 5.7Hz), 8.37 (1, d, J 8.5Hz), 8.14 (1H, d, J 5.8Hz), 7.91 (1H, d, J 5.7Hz), 7.55 (1H, d, J 5.8Hz), 7.39 (2H, d, J 8.4Hz), 7.28 (2H, d, J 8.4Hz), 4.53 (1H, s), 4.14 (1H, dd, J 9.8,4.3Hz), 3.25 (1H, dd, J 14.0,4.6Hz), 3.0 (1H, dd, J 10.3,14. 0Hz), 1.50-0.64 (14H, m). m/z (ES+, 70V) 460.1 and 461.1 (MH+).

EXAMPLE 11 <BR> <BR> <BR> <BR> Ethvl (2S)-2-r (4R, S)-4-methvl-3-oxo-4-Propvl-1-cyclobutenvllamino-3 [4-([2,7]naphthyridin-1-yloxy)phenyl]propanoate A solution of Intermediate 2 (300mg, 2. 1mmol) and the ethyl ester of Intermediate 13 (724mg, 2.14mmol), in DCM (15ml), was stirred at room temperature for 24h. The reaction was then diluted with DCM (30ml) and distilled water (20ml) and washed successively with 1 M aqueous hydrochloric acid (30ml) water (30ml) and saturated, aqueous sodium hydrogen carbonate (30ml). The organic layer was then dried (MgS04), filtered and concentrated in vacuo. The residual foam was chromatographed (Si02 ; EtOAc) to give the title compound as a white powder (827mg, 1. 8mmol, 84%) as an approx. 1: 1 mixture of diastereomers. 6 [3H (CDCI3, 300K) 9.72 (1H, s), 8.71 (1H, d, J 5.7Hz), 8.04 (1H, d, J 5.8Hz), 7.55 (1H, d, J 5.7Hz), 7.22-7.12 (5H, m), 5.80 (1H, d, J 7.6Hz), 4.57 (1 H, s), 4.28-4.20 (3H, m), 3.25-3.07 (2H, m), 1.57-1.21 (7H, m), 1.18 and 1.17 (3H, s) 0.84-0.78 (3H, m). m/z (ES+, 70V) 460.1 (MH+) and 482.0 (MNa+).

EXAMPLE 12 (2S)-2-r (4R, S)-4-Methyl-3-oxo-4-propyl-1-cyclobutenyl]amino-3-[4- ([2,7]naphthyridin-1-yloxy)phenyl]propanoic acid The compound of Example 11 (600mg, 1. 31mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (520mg, 1. 21mmol, 92%) as an approx. 1: 1 mixture of diastereomers. 8H (DMSO d6,300K) 9.61 and 9.58 (1 H, s), 8.72 (1 H, d, J 5.7Hz), 8.39-8. 33 (1 H, m NH), 8.04-8.00 (1 H, m), 7.80-7.79 (1 H, m), 7.45- 7.33 (1H, m), 7.32-7.25 (2H, m), 7.18-7.12 (2H, m), 4.37 and 4.32 (1H, s), 4.10-4.04 (1H, m), 3.17-3.12 (1H, m), 2.94-2.82 (1H, m), 1.41-0.86 (4H, m), 0.99 and 0.91 (3H, s) 0.73 and 0.63 (3H, t, J 7.2Hz). m/z (ES+, 70V) 432.0 (MH+).

EXAMPLE 13 Ethyl (2S)-2-r (4R, S)-4-methyl-3-oxo-4-propvl-1-cyclobutenvilamino-3- [4-([2,6]naphthyridin-1-ylamino)phenyl]propanoate Prepared from Intermediate 2 (200mg, 1.43mmol) and Intermediate 23 (400mg, 1.19mmol), in a similar manner to the compound of Example 11 to give the title compound as an approx. 1: 1 mixture of diastereomers as a white powder (482mg, 1.05mmol, 89%). 8H (CDC13, 300K) 9.13 (1H, s), 8.61 (1H, d, J 5.9Hz), 8.17 (1H, d, J 5.8Hz), 7.66-7.60 (3H, m), 7.19-7.04 (5H, m), 5.62 (1H, t, J 4.6Hz), 4.51 and 4.49 (1H, s), 4.25-4.19 (3H, m), 3.16-3.05 (2H, m), 1.51-1.16 (7H, m), 0.85-0.77 (3H, m). m/z (ES+, 70V) 459.1 (MH+).

EXAMPLE 14 (2S)-2-r (4R, S)-4-Methyl-3-oxo-4-propyl-1-cvclobutenyllam ino-3-r4- (f2, 61naphthyridin-1-vlamino) phenyllpropanoic acid The compound of Example 13 (600mg, 1. 31mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a pale yellow powder (521 mg, 1. 21mmol, 95%) (approx. 1: 1 mixture of diastereomers). 8H (DMSO d6,300K) 9.10 (1H, s), 8.55-8.53 (1H, m), 8.37 and 8.31 (1H, m NH), 8.27 (1H, d, J 5.9Hz), 7.72-7.65 (2H, m), 7.15- 7.08 (3H, m), 4.30 and 4.25 (1 H, s), 3.99-3.94 (1 H, m), 3.06-2.99 (1 H, m), 2.83-2.76 (1 H, m), 1.34-0.96 (4H, m), 0.94 and 0.86 (3H, s), 0.68 and 0.55 (3H, t, J 7.0Hz). m/z (ES+, 70V) 431.0 (MH+).

EXAMPLE 15 Ethyl (2S)-2-r (4R, S)-4-methyl-3-oxo-4-propvl-1-cyclobutenvllamino-3- f4-r (3, 5-dichloroisonicotinovl) aminolphenvllpropanoate Prepared from Intermediate 2 (120mg, 0.86mmol) and the free base of Intermediate 27 (300mg, 0.79mmol), in a similar manner to the compound of Example 11 to give title compound as an approx. 1: 1 mixture of diastereomers as a white powder (318mg, 0.63mmol, 80%). 8H (CDCl3,

300K) 8.56 (2H, s), 8.29 and 8.24 (1H, s NH), 7.61-7.59 (2H, m), 7.16- 7.10 (2H, m), 5.82-5.78 (1H, m), 4.56 (1H, s), 4.32-4.26 (3H, m), 3.29-3.23 (1H, m), 3.16-3.09 (1H, m), 1.59-1.13 (7H, m), 0.89-0.84 (3H, m). m/z (ES+, 70V) 504.0 and 506.0 (MH+).

EXAMPLE 16 (2S)-2-r (4R, S)-4-Methvl-3-oxo-4-propvl-1-cyclobutenvilam i no-3-f4- r (3. 5-Dichloroisonicotinoyl)amino]phenyl}propanoic acid The compound of Example 15 (300mg, 0.59mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (261 mg, 0.55mmol, 92%) (approx. 1: 1 mixture of diastereomers). 8H (DMSO d6,300K) 10.90 (1H, s), 8.81 (2H, s), 7.60- 7.56 (2H, m), 7.31-7.26 (2H, m), 4.45 and 4.42 (1H, s), 4.15-4.41 (1H, m), 3.23-3.14 (1H, m), 2.99-2.89 (1H, m), 1.49-1.12 (3H, m), 1.07 and 0.99 (3H, s), 0.84-0.54 (4H, m). m/z (ES+, 70V) 476.0 and 478.0 (MH+).

EXAMPLE 17 Ethvl (2S)-2-[(4,4-dimethyl-3-oxo-2-hexyl-1-cyclobutenyl)amino]-3- {4- [ (3, 5-dichloroisonicotinovl) aminolphenyllpropanoate Prepared from Intermediate 6 (200mg, l. 0mmol) and the free base of Intermediate 27 (200mg, 0.52mol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (201 mg, 0.42mmol, 72%). 8H (CDCl3, 300K) 8.99 (1 H, s), 8.42 (2H, s), 7.52 (2H, d, J 8.4Hz), 7.02 (2H, d, J 7.6Hz), 5.54 (1H, s), 4.34 (1H, s), 4.19 (2H, q, J 7.1 Hz), 3.07 (2H, br s), 1.95-1.81 (2H, br s), 1.27-0.77 (17H, m). m/z (ES+, 70V) 560.0 and 562.0 (MH+).

EXAMPLE 18 (2S)-2-[(4,4-Dimethyl-3-oxo-2-hexyl-1-cyclobutenyl)amino]-3- {4-[(3,5- dichloroisonicotinovl) aminolphenvlTpronanoic acid

The compound of Example 17 (80mg, 0.14mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as an off-white powder (62mg, 0. 12mmol, 82%). 8H (DMSO d6,300K) 10.53 (1 H, s), 8.73 (2H, s), 7.60-7.56 (2H, m), 7.57 (2H, d, J 8.4Hz), 7.30 (2H, d, J 8.4Hz), 4.14-4.12 (1H, m), 3.17 (1H, dd, J 13.9,4.8Hz), 3.03 (1H, dd, J 13.0,9.1 Hz), 1.87 (2H, t, J 7.3Hz), 1.41-1.25 (9H, m), 1.15-0.86 (8H, m). m/z (ES+, 70V) 532.0 and 534.0 (MH+).

EXAMPLE 19 Ethvl (2S)-2-r (4, 4-dimethvl-3-oxo-2-hexyl-1-cyclobutenvl) aminol-3-r4- Lf2, 71naphthvridin-1-vloxy) phenvl1 propanoate Prepared from Intermediate 6 (200mg, l. 0mmol) and the ethyl ester of Intermediate 13 (200mg, 0.59mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (201 mg, 0.42mmol, 72%). 8H (CDCl3, 300K) 9.72 (1H, s), 8.71 (1H, d, J 5.7Hz), 8.03 (1H, d, J 5.8Hz), 7.56-7.51 (1H, m), 7.27-7.17 (4H, m), 5.41 (1H, br m), 4.39 (1H, br m), 4.19 (2H, q, J 7. 1Hz), 3.15-3.12 (2H, m), 1.91-1.75 (2H, m), 1.39-1.09 (18H, m), 0.81-0.74 (2H, m). m/z (ES +, 70V) 516.1 (MH+).

EXAMPLE 20 (2S)-2-r (4, 4-Di methyl-3-oxo-2-hexyl-1-cvclobutenvl) aminol-3-f4- (r2s7lnaphthyridin-1-vloxv) nhenvllpropanoic acid The compound of Example 19 (200mg, 0.39mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (161mg, 0.33mmol, 85%). 8EIH (DMSO d6,360K) 9.62 (1 H, s), 8.74 (1 H, d, J 5.6Hz), 8.04 (1 H, d, J 5.6Hz), 7.82 (1 H, d, J 5.6Hz), 7.47 (1H, d, J 5.5Hz), 7.30 (2H, d, J 8.3Hz), 7.17 (2H, d, J 8.3Hz), 4.02 (1H, br s), 3.21-3.18 (1H, m), 2.97-2.91 (1H, m), 1.74 (2H, m), 1.12-0.62 (17H, m). m/z (ES+, 70V) 488.1 (MH+).

EXAMPLE 21 Ethyl (2S)-2-[(4,4-dimethyl-3-oxo-2-hexyl-1-cyclobutenyl)amino]-3- {4- r(3-methyl[2,7]naphthyridin-1-yl)oxy]phenyl{propanoate Prepared from Intermediate 6 (200mg, l. 0mmol) and Intermediate 18 (300mg, 0.85mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (331 mg, 0.63mmol, 73%).

8H (CDCl3, 300K) 9.70 (1 H, s), 8.70 (1 H, d, J 5.8Hz), 7.51 (1 H, d, J 5.8Hz), 7.26-7.19 (4H, m), 5.34 (1H, br s), 4.45 (1H, br s), 4.26 (2H, q, J 7.2Hz), 3.21 (2H, br s), 2.44 (3H, s), 2.10-1.90 (2H, m), 1.47-1.43 (2H, m), 1.33-1.12 (12H, m), 0.87-0.84 (3H, m). m/z (ES+, 70V) 530.1 (MH+).

EXAMPLE 22 (2S)-2-[(4,4-Dimethyl-3-oxo-2-hexyl-1-cyclobutenyl)amino]-3- {4-[ (3- methyl[2,7]naphthyridin-1-yl)oxy]phenyl}propanoic acid The compound of Example 21 (60mg, 0. 11mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (42mg, 0.08mmol, 74%). aH (DMSO d6,360K) 9.59 (1 H, s), 8.70 (1H, d, J 5.7Hz), 7.70-7.68 (1H, m), 7.66 (1H, d, J 9.7Hz), 7.37 (2H, d, J 8.6Hz), 7.31 (1H, s), 7.23 (2H, d, J 8.6Hz), 4.18-4.16 (1H, m), 3.24 (1H, dd, J 13.9,4.4Hz), 3.04 (1H, dd, J 13.9,9.9Hz), 2.38 (3H, s), 1.86 (2H, t, J 7.3Hz), 1.38-1.19 (8H, m), 1.04 (3H, s), 0.99 (3H, s), 0.83- 0.79 (3H, m). m/z (ES+, 70V) 502.1 (MH+).

EXAMPLE 23 <BR> <BR> <BR> <BR> <BR> Ethvl (2S)-2-f (4R, S)-4-benzvl-4-methvl-3-oxo-1-cyclobutenvilamino-3-<BR> <BR> <BR> <BR> <BR> <BR> <BR> {4-r(3-methvlf2, 71naphthyridin-1-vl) oxvlphenyllpropanoate Prepared from Intermediate 8 (200mg, l. 0mmol) and Intermediate 20 (300mg, 0.85mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (412mg, 0.79mmol, 92%) as an approx. 1 : 1 mixture of diastereomers. 8H (CDC13, 300K) 9.70 (1H, d, J 4.9Hz), 8.71 and 8.70 (1H, d, J 5.8Hz), 7.51 (1H, d, J 5.8Hz), 7.31-7.08

(11H, m), 5.88-5.82 (1H, m), 4.60 and 4.50 (1H, s), 4.33-4.28 (1H, m), 4.26-4.16 (2H, m), 3.25-3.07 (2H, m), 2.98-2.83 (2H, m), 2.45 and 2.40 (3H, s), 1.35-1.21 (6H, m). m/z (ES+, 70V) 522.1 (MH+).

EXAMPLE 24 (2S)-2-[(4R,S)-4-Benzyl-4-methyl-3-oxo-1-cyclobutenyl]amino- 3-{4-[(3- methylf2, 71naphthyridin-1-vl) oxylphenyllpropanoic acid The compound of Example 23 (250mg, 0.48mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (221mg, 0.45mmol, 94%) as an approx. 1: 1 mixture of diastereomers. 8H (DMSO d6,360K) 9.72 (1 H, m), 8.81 (1 H, m), 8.03 (1 H, m), 7.82-7.77 (1H, br m), 7.46-7.20 (9H, m), 4.49 and 4.41 (1H, s), 4.21 (1H, m), 3.39-3.30 (1H, m), 3.21-3.14 (1H, m), 3.01-2.87 (2H, m), 2.51 (3H, s), 1.29 and 1.24 (3H, s). m/z (ES+, 70V) 494.0 (MH+).

EXAMPLE 25 Ethyl (2S)-2-r (4R, S)-4-benzvl-4-methyl-3-oxo-1-cyclobutenvilamino-3- 4-f (3, 5-dichloroisonicotinovl) aminolphenvlpropanoate Prepared from intermediate 8 (185mg, 0.98mmol) and the free base of Intermediate 27 (300mg, 0.79mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (387mg, 0.70mmol, 89%) as an approx. 1: 1 mixture of diastereomers. 8H (CDC13, 300K) 9.36 and 9.31 (1 H, s), 8.36 and 8.35 (2H, s), 7.54 and 7.45 (1 H, d, J 8.4Hz), 7.19-7.02 (8H, m), 6.09-6.03 (1H, m), 4.31 and 4.20 (1H, s), 4.22-4.01 (3H, m), 3.07-2.92 (2H, m), 2.76-2.63 (2H, m), 1.35-1.15 (2H, m), 1.09 and 1.08 (3H, s). m/z (ES+, 70V) 551.9 and 553.9 (MH+).

EXAMPLE 26 (2S)-2-r (4R. S)-4-Benzvl-4-methyl-3-oxo-1-cvclobutenvilamino-3-4- r (3,5-dichloroisonicotinoyl)amino]phenyl}propanoic acid

The compound of Example 25 (320mg, 0.58mmol) was hydrolyse in a similar manner to the method of Example 12 to give the title compound as a fine white solid (277mg, 0.53mmol, 91%) as an approx. 1: 1 mixture of diastereomers. 8H (DMSO d6,360K) 13.05 (1 H, br s), 8.83 and 8.82 (2H, s), 8.67 and 8.62 (1H, d, J 8.9Hz), 7.71 and 7.61 (2H, d, J 8.7Hz), 7.37- 6.89 (9H, m), 4.32 and 4.23 (1 H, s), 4.09-4.00 (1 H, m), 3.20-2.64 (4H, m), 1.24-1.07 (3H, m). m/z (ES+, 70V) 523.9 and 525.9 (MH+).

EXAMPLE 27 Ethvl (2S)-2-r (3-oxospiror3. 51non-1-en-1-yl) aminol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenvllpropanoate Prepared from 1-keto-3-hydroxyspiro [3,5]-non-2-ene (400mg, 2.6mmol) [prepared according to the method of Wasserman, H. H. et al, J. Org.

Chem., 38,1451-1455 (1973)] and the free amine of Intermediate 27 (400mg, 1.04mol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (512mg, 0.99mmol, 95%).

5H (CDCl3, 300K) 10.86 (1H, s), 8.78 (2H, s), 8.34 (1H, d, J 8.5Hz), 7.56 (2H, d, J 8.5Hz), 7.25 (2H, d, J 8.5Hz), 4.36 (1H, s), 4.20-4.11 (3H, m), 3.13 (1H, dd, J 13.8,5.3Hz), 3.00 (1H, dd, J 9.2,13.8Hz), 1.67-1.19 (10H, m), 1.17 (3H, t, J 4.1 Hz). m/z (ES+, 70V) 516.0 and 518.0 (MH+).

EXAMPLE 28 (2S)-2-[(3-Oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[(3,5- dichlorolsonicotinovl) aminolphenvilpropanoic acid The compound of Example 27 (700mg, 1.36mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (627mg, 1.28mmol, 95%). 8H (DMSO d6,360K) 10.54 (1H, s), 8.73 (2H, s), 7.81 (1H, d, J 8.4Hz), 7.56 (2H, d, J 8.5Hz), 7.27 (2H, d, J 8.5Hz), 4.39 (1H, s), 4.12-4.05 (1H, m), 3.19 (1H, dd, J 13.9, 5. 1Hz), 3.00 (1H, dd, J 13.9,8.8Hz), 1.94-1.24 (10H, m). m/z (ES+, 70V) 488.0 and 490.0 (MH+).

Example 29 Ethyl (2S)-2-[(3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[(3- methylf2, 71naphthvridin-1-vl) oxvlphenvllpropanoate Prepared from 1-keto-3-hydroxyspiro [3,5]-non-2-ene (400mg, 2.6mmol) and Intermediate 20 (400mg, 1.14mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (497mg, 1.02mmol, 89%). 8H (CDCl3, 300K) 9.62 (1H, s), 8.72 (1H, d, J 5.7Hz), 7.99 (1 H, d, J 8.6Hz), 7.73 (1 H, dd, J 5.7,0.9Hz), 7.37-7.34 (3H, m), 7.28-7.24 (2H, m), 4.42 (1H, s), 4.26-4.18 (3H, m), 3.25 (1H, dd, J 14.0,5.6Hz), 3.12 (1H, dd, J 14.0,9. 1Hz), 2.42 (3H, s), 1.72-1.55 (10H, m), 1.25 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 486.1 (MH+).

EXAMPLE 30 (2S)-2-r (3-Oxospiror3. 51non-1-en-1-yl) aminol-3-f4-f (3- methyl[2,7]naphthyridin-1-yl)oxy]phenyl}propanoic acid The compound of Example 29 (300mg, 0.62mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (237mg, 0.52mmol, 84%). SH (DMSO d6,360K) 9.62 (1 H, s), 8.72 (1 H, d, J 5.7Hz), 7.82 (1 H, d, J 6.3Hz), 7.73 (1 H, d, J 5.5Hz), 7.35 (2H, d, J 8.7Hz), 7.25 (2H, d, J 8.7Hz), 4.39 (1H, s), 4.12 (1H, dd, J 8.7, 13.2Hz), 3.34-3.12 (2H, m), 2.42 (3H, s), 1.72-1.53 (10H, m). m/z (ES+, 70V) 458.0 (MH+).

EXAMPLE 31 Ethvl (2S)-2-r (2-bromo-3-oxospirof3. 51non-1-en-1-vl) aminol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenyl propanoate A solution containing the compound of Example 27 (500mg, 0.97mmol) and triethylamine (2eq, 270Z1) in THF (10ml) at 0 was treated dropwise with a solution of bromine (1. leq, 170mg) in THF (5ml). After 20mins the reaction was allowed to warm to room temperature prior to dilution with

EtOAc (100ml). The crude reaction mixture was washed with saturated aqueous NaHCO3 (20ml) and brine (20ml), dried (MgS04) filtered and concentrated in vacuo. The residual foam was chromatographed (Si02 ; EtOAc) to give the title compound as a white powder (511 mg, 0.86mmol, 95%). 8H (CDCI3, 300K) 8.48 (2H, s), 8.05 (1H, s br), 7.52 (2H, d J 8.4Hz), 7.04 (2H, d J 8.5Hz), 5.81 (1H, d br, J 8.3Hz), 4.98-4.91 (1H, m), 4.21 (2H, q, J 7.1Hz), 3.21 (2H, d J 5.3Hz), 1.70-1.66 (4H, m), 1.53-1.44 (4H, m), 1.28 (3H, t J 7.1 Hz), 1.20-1.16 (2H, m). m/z (ES+, 70V) 597.9 and 595.0 (MH+).

EXAMPLE 32 (2S)-2-[(2-Bromo-3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[( 3,5- dichloroisonicotinovl) aminolphenvlTpropanoic acid The compound of Example 31 (511mg, 0.86mmol) was hydrolyse in a similar manner to the method of Example 2 (1.3eq, 50mg), to give the title compound as a white powder (421 mg, 0.74mmol, 87%). 8H (DMSO d6, 390K) 10.34 (1H, s), 8.67 (2H, s), 7.53 (2H, s br), 7.26 (2H, d J 8.26Hz), 4.67 (1H, m), 3.26-3.22 (1H, m), 3.13-3.08 (1H, m), 1.67-1.21 (10H, m).

8C (DMSO-d6,300K) 23.86,25.30,30.75,37.79,57.98,61.94,67.02, 119.73,128.47,130.38,133.46,136.86,142.85,148.10,160.11,171. 80, 173.96,186.93. m/z (ES+, 70V) 569.9 and 567.9 (MH+).

EXAMPLE 33 Ethyl (2S)-2-r (2-bromo-4, 4-dimethvl-3-oxo-1-cyclobutenyl) aminol-3-f4- [(3,5-dichloroisonicotinoyl)amino]phenyl}propanoate Bromine (1. 1eq, 0.32mut) was added dropwise to a stirred solution of the compound of Example 5 (2.7g, 5.67mmol) in THF (25ml) at room temperature. After 25min the reaction was diluted with EtOAc (100mut) and the crude reaction mixture washed with saturated aqueous NaHCO3 (20ml) and brine (20moi), dried (MgS04) filtered and concentrated in

vacuo. The residual foam was chromatographed (Si02 ; EtOAc) affording the title compound as a pale yellow powder (2.51g, 4.53mmol, 76%). 8H (CDCl3, 300K) 8.46 (2H, s), 8.17 (1H, s br), 7.51 (2H, d J 8.4Hz), 7.04 (2H, d J 8.4Hz), 6.05 (1 H, d br, J 8.4Hz), 4.98-4.92 (1 H, m), 4.22 (2H, q, J 7.1 Hz), 3.21 (2H, d J 5. 4Hz), 1.28 (3H, t J 7.1Hz), 1.14 (3H, s), 1.13 (3H, s). m/z (ES+, 70V) 555.8 and 557.9 (MH+).

EXAMPLE 34 (2S)-2-r (2-Bromo-4,4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-f4-f (3,5- dichloroisonicotinovl) aminolphenyllpropanoic acid The compound of Example 33 (198mg, 0.36mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white powder (142mg, 0.27mmol, 75%). 8H (DMSO-d6,390K) 10.46 (1H, s), 8.74 (2H, s), 7.63 (2H, d J 5.74Hz), 7.35 (2H, d J 8.26Hz), 4.80 (1H, s br), 3.32 (1 H, dd J 5. 14,14.2Hz), 3.14 (1 H, dd J 8. 9Hz 14. 2Hz), 1.18 (3H, s), 1.15 (3H, s). m/z (ES+, 70V) 527.9 and 529.8 (MH+).

EXAMPLE 35 Ethvl (2S)-2-[(3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4- F (2, 7) naphthvridin-1-vloxvlphenylpropanoate A solution of the ethyl ester of Intermediate 13 (565mg, 1.68mmol) and 1- keto-3-hydroxyspiro [3,5]-non-2-ene (280mg, 1.84mmol) in DCM (20mi) was stirred at roon temperature for 24h. Concentration in vacuo and chromatography (Si02 ; EtOAc) to give the title compound as a pale yellow powder (730mg, 1.55mmol, 92%). bH (CDCl3, 300K) 9.82 (1H, s), 8.82 (1 H, d J 5.7Hz), 8.14 (1 H, d J 5.9Hz), 7.64 (1 H, d J 5.8Hz), 7.25-7.17 (6H, m), 5.77 (1 H, d J 7. 6Hz), 4.60 (1 H, s), 4.25 (2H, q J 7. 1 Hz), 3.30 (1 H, dd J 5.5Hz 13.9Hz), 3.18 (1H, dd J 5.5Hz 13.9Hz), 1.84-1.53 (10H, m), 1.35 (3H, t J 7.1 Hz). m/z (ES+, 70V) 472.1 (MH+).

EXAMPLE 36 Ethyl(2S)-2-[(2-bromo-3-oxospiro[3.5]non-1-en-1-yl)amino]-3- {4- (2,7)naphthyridin-1-yloxy]phenyl}propanoate A stirred solution of the compound of Example 35 (300mg, 0.637mmol) and triethylamine (1.2eq, 100µl) at 0g was treated dropwise with a solution of bromine in DCM (2% wv/v, 2. 1ml, 1.2eq). After 12h the reaction was diluted with DCM (50ml) and washed successively with saturated aqueous NaHCO3, dried (MgS04) filtered and concentrated in vacuo. The residual foam was triturated with diisopropylether and the resulting solid collected and dried in vacuo to give the title compound as a pale yellow powder (325mg, 0.59mmol, 95%). 8H (CDCl3, 300K) 9.83 (1H, s), 8.78 (1H, d J 5.8Hz), 8.16 (1 H, d J 5. 8Hz), 7.69 (1H, d, J 5. 7Hz), 7.32 (1H, d, J 5.8Hz), 7.27 (4H, s), 5.87 (1H, d, J 8.4Hz), 5.10-5.03 (1H, m), 4.30 (2H, q, J 7.1 Hz), 3.38-3.32 (2H, m), 1.85-1.69 (4H, m), 1.67-1.50 (6H, m), 1.36 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 552.0 (MH+).

EXAMPLE 37 (2S)-2-f (2-Bromo-3-oxospiror3. 51non-1-en-1-vl) aminol-3-f4- f (2, 7) naphthvridin-1-yloxylphenyl} propanoic acid The compound of Example 36 (220mg, 0.40mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (125mg, 0.24mmol, 60%). 8H (DMSO-d6, 300K) 9.27 (1 H, s), 8.88 (1H, d J 9.4Hz), 8.83 (1H, d J 5.4Hz), 8.12 (1H, d J 5.8Hz), 7.90 (1 H, d J 5.7Hz), 7.55 (1 H, d J 5.8Hz), 7.38 (2H, d J 8.4Hz), 7.27 (2H, d J 8.4Hz), 4.83-4.79 (1H, m), 3.08-3.03 (2H, m), 1.80-1.37 (8H, m), 1.19-1.12 (2H, m). m/z (ES+, 70V) 523.9 (MH+).

EXAMPLE 38 Ethvl (2S)-2-r (3-oxo-7-oxaspirof3. 51non-1-en-1-vl) aminol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenyllpropanoate

Prepared from 7-oxaspiro [3.5] nonane-1,3-dione (1.2g, 7.8mmol) and the free amine of Intermediate 27 (2.67g, 7. Ommol) in a similar manner to the method of Example 11, to give the title compound (3.31 g, 6.38mmol, 91%). #H (CDCl3, 300K) 8.61 (1H, s), 8.33 (2H, s), 7.41 (2H, d J 5Hz), 6.94 (2H, d J 8.5Hz), 6.30 (1H, s br), 4.35 (1H, s), 4.11 (2H, q J 7. 1 Hz) and (1H, m obscured), 5.72 (4H, m), 3.07 (1H, dd J 14.0,5.0Hz), 2.94 (1 H, dd J 14. 0,6.6Hz), 1.75-1.66 (2H, m), 155-1.48 (2H, m), 1.17 (3H, t J 7.1 Hz). m/z (ES+, 70V) 517.9 (MH+).

EXAMPLE 39 Ethvl (2S)-2-[(2-bromo-3-oxo-7-oxaspiro[3.5]non-1-en-1-yl)amino]-3 - f4-r (3, 5-dichloroisonicotinovl) aminolphenvlpropanoate A solution of the compound of Example 38 (1.64g, 3.17mmol) and triethylamine (0.69g, 970, u1, 6.8mmol) in THF (15ml) at 0~ was treated dropwise with a solution of bromine (560mg, 3. 1mmol) in THF (2ml). After 1h the resulting precipitate was removed by filtration, washed several times with cold EtOAc and dried to give the title compound as a white powder (1.53g, 2.56mmol, 81 %). 8H (DMSO d6,300K) 10.90 (1 H, s), 9.07 (1H, d J 9.0Hz), 8.81 (2H, s), 7.60 (2H, d J 8.4Hz), 7.28 (2H, d J 8.4Hz), 4.85-4.80 (1 H, m), 4.21 (2H, q J 7.1Hz), 3.81-3.76 (2H, m), 3.63-3.58 (2H, m), 3.23 (1H, dd J 13.8,4.8Hz), 3.05 (1H, dd J 13.8,9.4Hz), 2.07-1.94 (2H, m), 1.52-1.49 (1H, m), 1.34-1.31 (1H, m), 1.24 (3H, t J 7. 1Hz). m/z (ES+, 70V) 597.9 and 599.9 (MH+).

EXAMPLE 40 (2S)-2-r (2-Bromo-3-oxo-7-oxaspirof 3. 51non-1-en-1-vl) aminol-3-f4- [(3,5-dichloroisonicotinoyl)amino]phenyl}propanoic acid The compound of Example 39 (575mg, 0.96mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (283mg, 0.50mmol, 52%). AH (DMSO d6,390K) 10.88 (1 H, s), 8.98 (1H, d J 9.2Hz), 8.81 (2H, s), 7.59 (2H, d J 8.5Hz), 7.27 (2H, d J

8.5Hz), 4.78-4.72 (1 H, m), 3.82-3.75 (2H, m), 3.64-3.54 (2H, m), 3.24 (1 H, dd J 13.9,4.5Hz), 3.01 (1H, dd J 13.8,9.5Hz), 2.08-1.93 (2H, m), 1.52- 1.48 (1 H, m), 1.30-1.26 (1 H, m). m/z (ES+, 70V) 569.9 and 571.9 (MH+).

EXAMPLE 41 Methvl (2S)-2-f (3-oxospiror3. 51non-1-en-1-vl) aminol-3-(2ß dimethoxy[1,1'-biphenyl]-4-yl) propanoate To a solution of methyl (2S)-2-amino-3- (2, 6-dimethoxy [1,1'-biphenyl]-4- yl) propanoate (0.80g, 2.5mmol) in DCM (10ml) at room temperature was added 1-keto-3-hydroxyspiro [3,5]-non-2-ene (0.38g, 2.5mmol) and the mixture stirred for 48h. Volatiles were removed in vacuo and the residue purified by column chromatography (Si02 ; EtOAc) to give the title compound as a white solid (1.05g, 92%). 8H (CDC13) : 7.32-7.26 (3H, m), 7.12 (2H, d, J 8.2Hz), 6.92 (2H, d, J 8.3Hz), 5.90 (1 H, br d, J 8.2Hz), 4.60 (1H, s), 4.33 (1H, br), 3.86 (3H, s), 3.73 (6H, s), 3.30 (1H, dd, J 13.9, 5.3Hz), 3.13 (1H, dd, J 13.9,6.3Hz), 1.82-1.33 (10H, m). m/z (ES+, 70V) 450.1 (MH+).

EXAMPLE 42 (2S)-2-{(3-Oxospiro[3.5]non-1-en-1-yl)amino}-3-(2,6-dimethox y[1,1'- biphenvil-4-vl) propanoic acid The compound of Example 41 (0.40g, 0.9mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title comPound as a white solid (0.19g, 45%). 8H (DMSO d6) 8.25 (1 H, d, J 8.6Hz), 7.29-7.19 (3H, m), 7.07 (2H, d, J 7.9Hz), 6.70 (2H, d, J 8.4Hz), 4.32 (1H, s), 4.11 (1H, br), 3.61 (6H, s), 3.18 (1H, dd, J 13.7,4.7Hz), 2.93 (1H, dd, J 13.7 9.9Hz), 1.67-1.16 (10H, m). m/z (ES+, 70V) 436.1 (MH+).

EXAMPLE 43 Methvl (2S)-2-r (2-bromo-3-oxospiror3. 51non-1-en-1-yl) aminoT-3-(2, 6- dimethoxvfl, l'-biphenvll-4-vl) propanoate

To a cooled solution (0-5°) of the compound of Example 41 (0. 42g, 0.93mmol) and triethylamine (0. 14ml, 1.03mmol) in THF (10ml) was added a solution of bromine (0.16g, 1. 0mmol) in DCM (1ml). The mixture was stirred at this temperature for 1 h prior to partitioning between EtOAc (100ml) and sodium hydrosulfite (100ml, 5% aq.). The organics were separated, washed with water (50ml), brine (50moi), dried (Na2SO4), filtered and concentrated in vacuo to give the crude product as pale yellow foam. Column chromatography (Si02, 1: 1 EtOAc: hexanes) gave the title compound as a white foam (0.45g, 92%). SH (CDCl3) 7.32-7.26 (3H, m), 7.13 (2H, d, J 8.1 Hz), 6.66 (2H, d, J 8.4Hz), 5.80 (1H, br d, J 8.6Hz), 5.15- 5.08 (1H, m), 3.87 (3H, s), 3.73 (6H, s), 3.35 (1H, d, J 10.0Hz), 3.31 (1H, d, J 4.9Hz), 1.80-1.33 (10H, m). m/z (ES+, 70V) 529.0 and 530.0 (MH+).

EXAMPLE 44 (2S)-2-f (2-Bromo-3-oxospirof3. 51non-1-en-1-vl) aminoT-3-(2, 6- dimethoxv [1, 1'-biphenvl1-4-vl) propanoic acid The compound of Example 43 (0.36g, 0.7mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (0.23g, 58%). 8H (DMSO d6) 8.83 (1H, d, J 9.4Hz), 7.28 (1H, d, J 8.4Hz), 7.24-7.20 (2H, m), 7.10 (2H, d, J 8.1 Hz), 6.70 (2H, d, J 8.4Hz), 4.83-4.77 (1H, br), 3.61 (6H, s), 3.25 (1H, dd, J 13.8,9.8Hz), 2.95 (1H, dd, J 13.8,10.3Hz), 1.78-1.35 (10H, m). m/z (ES+, 70V) 516.0 and 517.0 (MH+).

EXAMPLE 45 Ethyl (2S)-2- (3-oxospiror3. 61dec-1-en-1-vl) aminol-3-4-r (3, 5-dichloro- isonicotinovl) aminolphenvllpropanoate Prepared from Intermediate 31 (400mg, 2.4mmol) and the free amine of Intermediate 27 (920mg, 2.4mmol) in a similar manner to the method of Example 11, to give the title compound (1.1g, 20.7mmol, 86%). 8H

(CDCl3, 300K) 8.57 (2H, s), 8.28 (1 H, s), 7.61 (2H, d J 8.5Hz), 7.14 (2H, d J 8.5Hz), 5.76 (1H, d J 7. 5Hz), 4.33-4. 23 (3H, m), 3.25 (1H, dd J 5. 3, 14. 0Hz), 3.12 (1H, dd J 5.7,13.9Hz), 1.95-1.89 (2H, m), 1.79-1.70 (4H, m), 1.71-1.50 (6H, m), 1.36 (3H, t J 7.1 Hz). m/z (ES+, 70V) 530.0 (MH+).

EXAMPLE 46 (2S)-2-[(3-Oxosprio[3.6]dec-1-en-1-yl)amino]-3-{4-[(3,5-dich loroiso- nicotinovl) aminol phenvlTpropanoic acid The compound of Example 45 (257mg, 0.57mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (257mg, 0. 51mmol, 89%). 8H (DMSO d6,390K) 10. 83 (1 H, s), 8.84 (2H, s), 7.39 (2H, d J 8.5Hz), 7.29 (2H, d J 8.5Hz), 4.30 (1 H, s), 4.12-3.98 (1H, m), 3.15 (1H, dd J 13.9,5.2Hz), 2.97 (1H, dd J 13.8, 9.5Hz), 1.85-1.78 (1H, m), 1.77-1.38 (11H, m). m/z (ES+, 70V) 502.0 (MH+).

EXAMPLE 47 Ethyl(2S)-2-[(2-bromo-3-oxospiro[3.6]dec-1-en-1-yl)amino]-3- {4-[(3,5- dichloroisonicotinovl) aminolphenvlpropanoate.

A solution of the compound of Example 45 (988mg, 1.87mmol) and triethylamine (520µl, 3.7mmol) in THF (20ml) at 0-was treated dropwise with a solution of bromine (330mg, 2.1mmol) in THF (2ml). After 1h the crude reaction mixture was diluted with EtOAc (50ml), saturated aqueous NaHCO3 (15ml) and saturated aqueous sodium chloride (15ml) and the crude product extracted with EtOAc (3 x 20ml). The combined extracts were dried (MgS04), concentrated in vacuo and the crude residue chromatographed (Si02, 1: 1 EtOAc: hexanes) to give the title compound as a white powder (965mg, 1.58mmol, 85%). 8H (CDC13, 300K) 8.61 (2H, s), 8.45 (1H, d, J 3.1 Hz), 7.63 (2H, d, J 8. 2Hz), 7.15 (2H, d, J 8. 2Hz), 5.91 (1H, d, J 8.1 Hz), 5.05-5.00 (1H, m), 4.30 (2H, q, J 7.1Hz), 3.30 (2H, d, J

5.4Hz), 1.98-1.90 (2H, m), 1.89-1.60 (10H, m), 1.22 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 609.9 and 611.9 (MH+).

EXAMPLE 48 (2S)-2-[(2-Bromo-3-oxospiro[3.6]dec-1-en-1-yl)amino]-3-{4-[( 3, 5- dichloroisonicotinoVl) aminolphenvlTpropanoic acid The compound of Example 47 (560mg, 0.92mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (412mg, 0. 71mmol, 77%). 8H (DMSO d6,380K) 10.40 (1H, s), 8.67 (2H, s), 7.55 (2H, d, J 8.5Hz), 7.26 (2H, d, J 8.5Hz), 4.52 (1H, brs), 3.22 (1H, dd, J14. 1,5.3Hz), 3.11 (1H, dd, J 13.9,8. OHz), 1.82- 1.29 (12H, m). m/z (ES+, 70V) 589.1 and 583.9 (MH+).

EXAMPLE 49 Ethvl (2S) 2-fr4, 4-dimethyl-2- (phenyiselenenVl)-3-oxo-1-cyclobutenvil amino} (3, 5-dichloroisonicotinoyl)amino]phenyl}popanoate A stirred solution of the compound of Example 5 (630mg, 1. 41mmol) in THF (15ml) at room temperature was treated dropwise with a solution of phenylselenenyl chloride (283mg, 1.48mmol). After 10min the crude reaction mixture was diluted with EtOAc (30ml) saturated aqueous NaHCO3 solution (50ml) and brine (50ml). The mixture was extracted with EtOAc (3 x 50ml), the combined extracts dried (MgS04) and concentrated in vacuo. The residual slurry was chromatographed (Si02, EtOAc) to give the title compound as a white powder (812mg, 1.29mmol, 91%). âH (CDCl3, 300K) 8.58 (2H, s), 7.75 (1 H, s), 7.53 (2H, d, J 8.3Hz), 7.35-7.11 (5H, m), 7.04 (2H, d, J 8.3Hz), 6.11 (1H, d, J 8.5Hz), 5.28-5.25 (1H, m), 4.20 (2H, q, J 7.1Hz), 3.17 (2H, m), 1.31 (6H, s), 1.28 (3H, t, J 7.1Hz). m/z (ES+, 70V) 631.9 (MH+).

EXAMPLE 50 (2S)-2-fr4, 4-dimethvl-2- (phenylselenenyl)-3-oxo-1-cvclobutenyil

amino}-3-{4-[ (3, 5-dichloroisonicotinovl) aminolphenyl} propanoic acid The compound of Example 49 (600mg, 0.95mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (503mg, 0. 83mmol, 87%). aH (DMSO d6,300K) 10.86 (1H, s), 9.11 (1H, d, J 8.9Hz), 8.81 (2H, s), 7.50 (2H, d, J 8.2Hz), 7.21 (2H, d, J 8.2Hz), 4.96-4.92 (1H, br s), 3.13 (1H, dd, J 13.8,4.5Hz), 2.94 (1H, dd, J 13.6,8.7Hz), 1.22 (3H, s), 1.14 (3H, s). m/z (ES+, 70V) 603.9 (MH+).

EXAMPLE 51 Ethyl(2S)-2-[(3-oxo-7-acetyl-7-azaspiro[3.5]non-1-en-1-yl)am ino]-3-{4- r (3s5-dichloroisonicotinovl) aminolphenvllpropanoate Prepared from Intermediate 33 (150mg, 0.77mmol), and the free amine of Intermediate 27 (150mg, 0.39mmol) in a similar manner to the method of Example 11, to give the title compound (143mg, 0.26mmol, 67%). 8H (DMSO d6, 300K) 10.89 (1 H, s), 8.89 (2H, s), 8.55-8.48 (1 H, m), 7.58 (2H, d, J 7.9Hz), 7.25 (2H, d, J 7.9Hz), 4.47 (1H, s), 4.29-4.23 (1H, m), 4.16 (2H, q, J 7.1Hz), 3.76-3.72 (1H, m), 3.15 (1H, dd, J 13.8,5.2Hz), 3.01- 2.89 (2H, m), 2.00 (3H, s), 1.90-1.37 (6H, m), 1.21 (3H q J 7. 1Hz). m/_ (ES+, 70V) 559.0 (MH+).

EXAMPLE 52 (2S)-2-[(3-Oxo-7-acetyl-7-azaspiro[3.5]non-1-en-1-yl)amino]- 3-{4- r (35-dichloroisonicotinovl) aminolphenvllpropanoic acid The compound of Example 51 (200mg, 0.35mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (91 mg, 0. 16mmol, 46%). 8H (CD30D, 300K) 8.90 (2H, s), 7.60 (2H, d, J 8.2Hz), 7.30 (2H, J 8.2Hz), 4.49 (1 H, s), 4.33-4.27 (2H, m), 3.85-3.77 (1H, m), 3.57-3.45 (1H, m), 3.37-3.31 (1H, m), 3.20-3.11 (1H,

m), 3.05-2.99 (1H, m), 2.11 (3H, s), 1.97-1.52 (4H, m). m/z (ES+, 70V) 531.0 (MH+).

EXAMPLE 53 Ethyl (2S)-2-f (7-methoxv-3-oxospirof3. 51non-1-en-1-vl) aminol-3-f4- [ (3, 5-dichloroisonicotinovl) aminolphenvl propanoate Prepared from Intermediate 35 (500mg, 2.77mmol) and the free amine of Intermediate 27 (980mg, 2.6mmol) in a similar manner to the method of Example 11, to give the title compound as an inseparable 1: 1 mixture of isomers (1.23g, 2.25mmol, 87%). 8H (CDCl3, 300K, 2 isomers) 9.12/8.99 (1H, s), 8.51/8.50 (2H, s), 7.59/7.56 (2H, d, J 8.5Hz), 7.08 (2H, d, J 8.5Hz), 6.21/5.98 (1H, d, J 7. 9Hz/7.6Hz), 4.46/4.43 (1H, s), 4.29/4.10 (3H, m), 3.13-3.08 (1H, m), 3.39 (1H, m), 3.30/3.29 (3H, s), 3.23-3.18 (1H, m), 3.13-3.08 (1H, m), 1.97-1.58 (8H, m), 1.35-1.34 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 546.0 (MH+).

EXAMPLE 54 (2S)-2-[(7-Methoxy-3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4- [ (3,5- dichloroisonicotinovl) ami nolphenvllpropanoic acid The compound of Example 53 (950mg, 1. 7mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder, as an approx. 1: 1 mixture of isomers (812mg, 1.57mmol, 92%). 8H (DMSO d6,300K) 10.57 (1H, s), 8.73 (2H, s), 7.93 (1H, br s), 7.56 (2H, d, J 8.2Hz), 7.29-7.21 (2H, m), 4.37 (1H, s), 4.08-4.04 (1H, m), 3.34 (1H, m), 3.25 (3H, s), 3.21-3.02 (2H, m), 1.92-1.34 (8H, m). m/z (ES+, 70V) 518.0 (MH+).

EXAMPLE 55 Ethyl (2S)-2-f (2-bromo-7-methoxv-3-oxospirof3. 51non-1-en-1- vl) aminol-3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvlpropanoate

Was prepared according to the method of Example 47 from the compound of Example 53 (1. 0g, 1.83mmol) and bromine (322mg, 2. Ommol) to give the title compound as a powder (778mg, 1.24mmol, 70%). [Separation of isomers at this stage was achieved chromatographically (Si02 ; 1: 1 EtOAc: hexanes to 100% EtOAc)]. 8H (CDCl3, 300K, fast eluting isomer) 10.65 (1H, s), 10.74 (1H, d, J 9.2Hz), 8.58 (2H, s), 7.36 (2H, d, J 8.6Hz), 7.06 (2H, d, J 8.6Hz) 4.54-4.48 (1H, m), 3.18 (1H, m), 3.03-2.98 (1H, m), 3.00 (3H, s), 2.78 (1H, dd, J 13.9, 10.0Hz), 1.18-1.65 (2H, m), 1.61-1.44 (4H, m), 1.18-1.15 (1H, m), 0.92 (1H, m). m/z (ES+, 70V) 625.9 (MH+).

EXAMPLE 56 (2S)-2-[(2-Bromo-7-methoxy-3-oxospiro[3.5]non-1-en-1-yl)amin o]-3-{4- [ (35-dichloroisonicotinovl) aminolphenvlTpropanoic acid The compound of Example 55 (650mg, 1.04mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title comPound as a white powder (512mg, 0.86mmol, 83%). 8H (DMSO d6,300K) 10.86 (1H, s), 9.11 (1H, d, J 8.9Hz), 8.81 (2H, s), 7.50 (2H, d, J 8.2Hz), 7.21 (2H, d, J 8.2Hz), 4.96-4.92 (1H, br s), 3.13 (1H, dd, J, 13.8,4.5Hz), 2.94 (1 H, dd, J 13.6,8.7Hz), 1.22 (3H, s), 1.14 (3H, s). m/z (ES+, 70V) 597.9 (MH+).

EXAMPLE 57 Ethyl (2S)-2-[(2-bromo-3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[( 3- methvlr2. 71naphthyridin-1-vl) oxvlphenyllpropanoate To the compound of Example 29 (0.54g, 1.1mmol) in THF (10ml) at room temperature was added triethylamine (0.2ml, 1. 4mmol) and a solution of bromine (224mg, 1.4mmol) in DCM (1 ml). The mixture was stirred overnight and then partitioned between EtOAc (50ml) and water (50ml).

The organics were separated, washed with sodium hydrosulfite (2 x 50ml, 5% aq.), water (50ml), brine (50ml), dried (Na2SO4), filtered and concentrated in vacuo. The crude product was subjected to column

chromatography (Si02 ; EtOAc) to give the title compound as a white solid (0.46g, 73%). 8H (CDCl3) 9.75 (1H, s), 8.69 (2H, d, J 5. 9Hz), 7.64 (2H, d, J 6. 0Hz), 7.25 (2H, d, J 8.2Hz), 7.20 (2H, d, J 8.2Hz), 5.89 (1H, d, J 8.3Hz), 5.06 (1H, dt, J 5.4,8.2Hz), 4.30 (2H, q, J 7.1 Hz), 3.35 (2H, m), 2.50 (3H, s), 1.84-1.33 (10H, m). m/z (ES+, 70V) 566.1 and 567.1 (MH+).

EXAMPLE 58 (2S)-2-{(2-Bromo-3-oxospiro[3.5]non-1-en-1-yl)amino}-3-{4-[( 3- methvl [2. 71naphthyridi n-1-vl) oxv1Phenvllpropanoic acid The compound of Example 57 (0.32g, 0.6mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white solid (0.20g, 66%). 8H (DMSO d6) 9.61 (1H, s), 8.88 (1H, d, J 9.5Hz), 8.72 (1 H, d, J 5.7Hz), 7.74 (1 H, d, J 5.8Hz), 7.35 (3H, c), 7.24 (2H, d, J 8.6Hz), 4.77 (1H, m), 3.18 (1H, dd, J 13.7,4.70Hz), 3.01 (1H, dd, J 13.7,10.4Hz), 2.49 (3H, s), 1.78-1.12 (10H, m). m/z (ES+, 70V) 537.1 and 538.1 (MH+).

EXAMPLE 59 Ethvl (2S)-2-{[2-(phenylsulfanyl)-4,4-dimethyl-3-oxo-1- <BR> <BR> <BR> <BR> cyclobutenvllamino-3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvl} propanoate A solution of the compound of Example 5 (340mg, 0.76mmol) in THF (25ml), at room temperature, was treated dropwise with a solution containing phenyl sulphenyl chloride (122mg, 0.84mmol) in THF (2ml).

After 10min the reaction mixture was poured into a mixture of EtOAc (150moi) and saturated aqueous NaHCO3 solution (50ml). The organic layer was extracted and washed with brine (25ml), dried (MgS04), filtered and concentrated in vacuo. Chromatography (Si02 ; 100% EtOAc) gave the title compound as a white powder (346mg, 0.59mmol, 78%). 8H (CDCl3) 8.45 (2H, s), 8.05 (1 H"s), 7.43 (1H, d, J 8.4Hz), 7.15 (2H, d, J

8.4Hz), 7.11-7.04 (5H, m), 6.25 (1H, d, J 8.5Hz), 5.10-5.05 (1H, m), 4.09 (2H, q, J 7.1 Hz), 3.11-3.06 (2H, m), 1.18 (3H, s), 1.15 (3H, s), 1.13 (3H, t, 7.1 Hz). m/z (ES+, 70V) 584.0 (MH+).

EXAMPLE 60 (2S)-2-ff2- (Phenvisulfanvl)-4, 4-dimethvl-3-oxo-1-cvclobutenvll- amino}-3-{4-[(3,5-dichloroisonicotinoyl)amino]phenyl}propano ic acid Hydrolysis of the ethyl ester (340mg, 0.58mmol) with lithium hydroxide (60mg, 1. 4mmol), according to the method of Example 2, gave the title compound (296mg, 0.53mmol, 90%) as a white powder. 8H (DMSO d6, 390K) 10.30 (1H, br s), 8.68 (2H, s), 7.45 (2H, br s), 7.26-7.22 (2H, m), 7.15-7.08 (7H, m), 4.75-4.66 (1H, m), 3.17 (1H, dd, J 14.0,5.3Hz), 3.04 (1H, dd J 14.0,7.7Hz), 1.19 (3H, s), 1.16 (3H, s). m/z (ES+, 70V) 556.0, 557.9 (MH+).

EXAMPLE 61 Ethyl (2S)-2-r (2-chloro-3-oxospiror3. 51non-1-en-1-vl) aminol-3-f4-f (3, 5- dichloroisonicotinovl) aminolphenyl propanoate A solution of the compound of Example 27 (366mg, 0.71mmol) in THF (25ml), at room temperature, was treated portionwise with N-chloro succinimide (100mg, 0.75mmol). After 30min the reaction mixture was poured into a mixture of EtOAc (150ml) and saturated aqueous NaHCO3 solution (50ml). The organic layer was extracted and washed with brine (25ml), dried (MgS04), filtered and concentrated in vacuo.

Chromatography (Si02 ; 70% EtOAc: hexanes) gave the title compound as a white powder (312mg, 0.56mmol, 80%). 8H (CDC13) 8.50 (2H, s), 7.73 (1 H, s), 7.53 (1 H, d, J 8.4Hz), 7.04 (2H, d, J 8.4Hz), 5.73 (1 H, d, J 8. 0Hz), 4.88-4.81 (1H, m), 4.21 (2H, q, J 7.1Hz), 3.21-3.16 (2H, m), 1.79-1.65 (4H, m), 1.51-1.36 (6H, m), 1.28 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 550.0 (MH+).

EXAMPLE 62 (2S)-2-f (2-Chloro-3-oxospiror3. 51non-1-en-1-vl) aminol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenvl} propanoic acid Hydrolysis of the compound of Example 61 (300mg, 0.54mmol) with lithium hydroxide (60mg, 1. 4mmol), according to the method of Example 2, gave the title compound. 8H (DMSO d6,390K) 10.44 (1H, br s), 8.69 (2H, s), 8.05-7.85 (1 H, s br), 7.54 (2H, d, J 7.8Hz), 7.25 (2H, d, J 7.8Hz), 4.60-4.49 (1H, m), 3.21 (1H, dd, J 14.0,5.3Hz), 3.04 (1H, dd, J 14.0, 5.1 Hz), 1.80-1.21 (10H, m). m/z (ES+, 70V) 521.9,525.9 (MH+).

EXAMPLE 63 Ethvl (2S)-2-[(2-iodo-3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[(3 ,5- dichloroisonicotinovl) aminolphenvllpropanoate To a stirred solution of the compound of Example 27 (1. 0g, 1. 9mmol) in THF (10ml) at room temperature was added N-iodosuccinamide (460mg, 2. 0mmol) in one portion. After 5 minutes the mixture was concentrated in vacuo and the residue triturated with a mixture of ether (10ml) and water (10ml), filtered and washed with ether and water. Oven drying gave the title compound (802mg, 66%) as a yellow solid. 8H (DMSO d6) 8.90 (1 H, d, J 9.1 Hz), 8.78 (2H, s), 7.58 (2H, d, J 8.5Hz), 7.25 (2H, d, J 8.5Hz), 4.91 (1H, m), 4.20 (2H, q, J 7.1 Hz), 3.30-3.00 (2H, m), 1.80-1.24 (10H, m), 1.21 (3H, t, J 7.1Hz). m/ (ES+, 70V) 642.0 (MH+).

EXAMPLE 64 Ethyl (2S)-3-f4-r (3, 5-dichloro-pyridine-4-carbonyl)-amino]-phenyl}-2- (3-oxo-2-pvridin-3-vl-spirof3. 51non-1-en-1-ylamino)-propanoate A mixture of the compound of Example 63 (1. 0g, 1. 6mmol), 10% palladium on charcoal (15mg), triphenylphosphine (100mg, 0.32mmol), copper (1) iodide (30mg, 0.16mmol), 3-pyridyl tributylstannane (560F1, 1. 7mmol) in DMF (10ml) was heated to 100° under a nitrogen atmosphere fro 2 hours. The sivent was removed by evaporation in vacuo and the

residue purified by column chromatography (Si02 ; 666: 333: 1 EtOAc: hexane; triethylamine) to give the title compound as a yellow oil (378mg, 41%). #H (DMSO d6) 8.76 (2H, s), 8.60 (1H, m), 8.30 (2H, br. s), 7.94 (1H, d, J 8.0Hz), 7.54 (2H, m), 7.34 (2H, m), 7.10 (1H, d, J 8.4Hz), 4.34 (1 H, m), 4.24 (2H, q, J 5. 3Hz), 3.25-2.95 (2H, m), 1.86-1.40 (10H, m), 1.26 (3H, t, J 5.3Hz). m/z (ES+, 70V) 593.0 (MH+).

EXAMPLE 65 <BR> <BR> <BR> <BR> (2S)-3-f4-r (3, 5-Dichloro-pvridine-4-carbonvl)-am inol-phenvlT-2-(3-oxo- 2-pyridin-3-yl-spiro[3.5]non-1-en-1-ylamino)-propanoic acid The compound of Example 64 was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (76%). 8H (DMSO d6,400K) 10.28 (1H, s), 8.66 (2H, s), 8.59 (1H, s), 8.34 (1H, m), 7.80 (1 H, m), 7.69 (1 H, m), 7.51 (2H, m), 7.24 (4H, m), 4.28 (1 H, m), 3.25- 3.07 (2H, m), 1.90-1.50 (1 OH, m). m/z (ES+, 70V) 565.0 (MH+).

EXAMPLE 66 <BR> <BR> <BR> <BR> Ethvl (2S)-3-f4-f (3, 5-Dichloro-pyridine-4-carbonvl)-aminol-phenvl}-2- (2-iodo-4,4-dimethvl-3-oxo-cvclobut-1-envlamino) propanoate Prepared in a similar manner to the compound of Example 63 from the compound of Example 5 to give the title compound as a white solid (72%).

8H (DMSO d6) 9.17 (1H, d, J 9.1 Hz), 8.79 (2H, s), 7.58 (2H, d, J 8.5Hz), 7.29 (2H, d, J 8.5Hz), 4.94 (1H, m), 4.20 (2H, q, J 7.1Hz), 3.25-3.00 (2H, m), 1.23 (3H, t, J 7.1Hz), 1.12 (3H, s), 1.03 (3H, s). m/z (ES+, 70V) 601.8 (MH+).

EXAMPLE 67 <BR> <BR> <BR> <BR> Ethvl (2S)-3-f4-r (3. 5-Dichloro-pyridine-4-carbonvl)-aminol-phenvl}-2- (4, 4-dimethvl-3-oxo-2-pyridin-3-vl-cvclobut-1-envlamino) propanoate

Prepared in a similar manner to the compound of Example 64 from the compound of Example 66 to give the title compound as a white solid (41 %). 8H (CDC13) 8.85 (1H, m), 8.57 (1H, m), 8.34 (3H, m), 7.92 (2H, m), 7.73 (2H, m), 7.28 (1H, m), 4.33 (1H, m), 4.15 (2H, q, J 7.1Hz), 3.32-3.09 (2H, m), 1.71 (3H, s), 1.33 (3H, s), 1.27 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 553.0 (MH+).

EXAMPLE 68 (2S)-3-{4-[(3,5-Dichloro-pyridine-4-carbonyl)-amino]-phenyl} -2-(4,4- dimethvl-3-oxo-2-pvridin-3-vl-cvclobut-1-enylamino) propanoic acid The compound of Example 67 was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (43%). 8H (DMSO d6, 400K) 10.28 (1H, br. s), 8.66 (3H, m), 8.33 (1H, m), 8.09 (1H, m), 7.75 (1H, m), 7.52 (2H, m), 7.27 (3H, m), 4.25 (1H, m), 3.26 (1H, m), 3.14 (1H, m), 1.22 (3H, s), 1.06 (3H, s). m/z (ES+, 70V) 524.9 (MH+).

EXAMPLE 69 (2S)-2-[(2-iodo-3-oxospiro[3.5]non-1-en-1-yl)amino]-3-{4-[(3 , 5- dichloroisonicotinoyl) aminolphenyl} propanoic acid The compound of Example 63 was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (98%). 8H (DMSO d6) 10.87 (1H, s), 8.84 (1 H, d, J 9.3Hz), 8.79 (2H, s), 7.58 (2H, d, J 8.5Hz), 7.27 (2H, d, J 8.5Hz), 4.87 (1H, m), 3.25 (1H, m), 3.02 (1H, m), 1.70-1.25 (10H, m). m/z (ES+, 70V) 613.8 (MH+).

EXAMPLE 70 (2S)-3-{4-[(3,5-Dichloro-pyridine-4-carbonyl)-amino]-phenyl} -2-(2- iodo-4, 4-dimethvl-3-oxo-cvclobut-1-envlamino) propanoic acid The compound of Example 66 was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (95%). 8H (DMSO d6) 10. 87 (1H, s), 9.08 (1H, d, J 9.3Hz), 8.78 (2H, s), 7.58 (2H, d,

J 8.5Hz), 7.26 (2H, d, J 8.5Hz), 4.88 (1 H, m), 3.25 (1H, m), 3.04 (1H, m), 1.12 (3H, s), 1.01 (3H, s). m/z (ES+, 70V) 573.8 (MH+).

EXAMPLE 71 Ethvl (2S)-3-{5-[(3,5-dichloroisonicotinoyl)amino]pyridin-2-yl}-2- [ (3- oxaspirof3. 51non-1-en-1-yl) am inolpropanoate To a solution of Intermediate 43 (470mg, 1.22mmol) in DCM (10ml) was added spiro [3.5] nonane-1,3-dione (187mg, 1.23mmol) with stirred for 18hr. After evaporation of the solvent the crude product was pyrified by chromatography (silica, 3-4 % MeOH/DCM) to afford the title compound as a white foam (610mg, 96%). 8H NMR (d6 DMSO) 8.81 (2H, s), 8.70 (1H, s), 8.33 (1H, d), 8.02 (1H, d), 7.32 (1H, d), 4.35 (1H, m), 4.13 (2H, m), 3.23 (2H, m), 1.53 (8H, br), 1.37 (2H, br), 1.17 (3H, t). m/z (ES+, 70V) 517 (MH+).

EXAMPLE 72 Ethyl (2S)-2-[(2-bromo-3-oxaspiro[3.5]non-1-en-1-yl)amino]-3-{5-[( 3, 5- dichloroisonicotinovl) aminolpvridin-2-vllpropanoate A solution of NBS (169mg, 0.94mmol) in dry DCM (5ml) was added to a stirred solution of the compound of Example 71 (490 mg, 0.94 mmol) in DCM (10mi) at 0°C (ice-water bath). After 30 min the solvent was evaporated in vacuo and the residue partitioned between Et20 (80ml) and saturated sodium bicarbonate (20ml). The phases were separated and the aqueous layer re-extracted with Et20 (40moi). The combined organics were washed with water (2 x 10mut), brine (10ml), dried (Na2SO4) and evaporated in vacuo and the residue purified by chromatography (silica, 50-80 % Et20/hexane) to give the title compound as a colourless glass foam (501mg, 88%). 8H NMR (d6 DMSO) 11.17 (1H, s), 8.83 (2H, s), 8.73 (1H, s), 8.01 (1H, d), 7.34 (1H, d), 5.06 (1H, dd), 4.20 (2H, q), 3.39-3.20 (2H, brm), 1.73 (1H, m), 1.57 (8H, br), 1.34 (1H, br), 1.22 (3H, t). m/z (ES+, 70V) 596 (MH+).

EXAMPLE 73 Ethyl (2S)-2-r (2-bromo-3-oxaspiro3. 51non-1-en-1-vl) aminol-3-f5-f (3, 5- <BR> <BR> <BR> <BR> dichloroisonicotinovl) aminolpvridin-2-vl ? propanoate hvdrochloride The compound of Example 72 (300mg, 0. 50mmol) was dissolved in EtOAc (20ml) and HCI gas bubbled through for a short time. The resulting white precipitate was collected by filtration, washed with Et20 and dried to give the title compound as a white powder (155 mg, 48 %). 6H NMR (d6 DMSO) 11.32 (1H, s), 8.84 (2H, s), 8.81 (1H, s), 8.13 (1H, d), 7.43 (1H, d), 5.06 (1H, dd), 4.19 (2H, q), 3.39 (1H, m), 3.28 (1H, m), 1.74 (1H, m), 1.57 (8H, br), 1.35 (1 H, br), 1.22 (3H, t). m/z (ES+, 70V) 631 (MH+).

EXAMPLE 74 (2S)-2-[(2-bromo-3-oxaspiro[3.5]non-1-en-1-yl)amino]-3-{5-[( 3, 5- dichloroisonicotinovl) aminolpvridin-2-vllpropanoic acid The compound of Example 72 (370mg, 0.62mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white solid (200 mg, 56 %) as light yellow solid. 8H NMR (d6 DMSO) 11.16 (1 H, s), 8.83 (2H, s), 8.73 (1 H, s), 8.05 (1 H, d), 7.35 (1 H, d), 5.00 (1 H, dd), 2.76 (2H, brm), 1.55 (8H, m), 1.27 (1H, br), 1.12 (1H, br). m/z (ES+, 70V) 568 (MH+).

EXAMPLE 75 Ethyl (2S)-2-[(2-chloro-3-oxaspiro[3.5]non-1-en-1-yl)amino]-3-{5-[ (3,5- dichloroisonicotinovl) aminolPvridin-2-vlTpropanoate A solution of NCS (247mg, 1.85mmol) in dry THF (10ml) was added to a stirred (ice-water bath cooled) solution of the compound of Example 71 (800mg, 1.54mmol) in THF (10ml) and DCM (10ml). After 2hr the solvent was evaporated in vacuo and the residue partitioned between Et20 (250ml) and saturated sodium bicarbonate (30ml). The phases were separated and the organic layer was washed with brine (10ml), dried

(Na2SO4) and evaporated in vacuo and the residue purified by chromatography (silica, 70-100 % Et20/hexane) to give the title compound as white foam (620mg, 72%). 8H NMR (d DMSO) 8.96 (2H, s), 8.86 (1H, s), 8.20 (1H, d), 7.50 (1H, d), 5.08 (1H, m), 4.32 (2H, q), 3.53- 3.31 (2H, brm), 1.72 (9H, m), 1.50 (1H, br), 1.34 (3H, t). m/z (ES+, 70V) 551 (MH+).

EXAMPLE 76 Ethyl (2S)-2-[(2-chloro-3-oxaspiro[3.5]non-1-en-1-yl)amino]-3-{5-[ (3,5- <BR> <BR> <BR> <BR> dichloroisonicotinovl) aminolpvridin-2-vllpropanoate hydrochloride The compound of Example 75 (269mg, 0.48mmol) was dissolved in EtOAc (20ml) and HCI gas bubbled through for a short time. The resulting precipitate was collected by filtration, washed with Et20 and dried to give the title compound (230 mg, 80.3 %). 8H NMR (d6 DMSO) 11.21 (1H, s), 8.83 (2H, s), 8.75 (1H, s), 8.08 (1H, d), 7.39 (1H, d), 4.95 (1H, m), 4.20 (2H, q), 3.36 (1 H, m), 3.26 (1 H, m), 1.71 (1 H, m), 1.57 (8H, br), 1.35 (1 H, m), 1.21 (3H, t). m/z (ES+, 70V) 587 (MH+).

EXAMPLE 77 (2S)-2-[ (2-chloro-3-oxaspiror3. 51non-1-en-1-vl) aminol-3-f5-r (3, 5- dichloroisonicotinovl) aminolpvridin-2-vllpropanoic acid The compound of Example 72 (250mg, 0.45mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white powder (142mg, 60 %). 8H NMR (d6 DMSO) 11.19 (1 H, s), 8.83 (2H, s), 8.74 (1H, s), 8.07 (1H, d), 7.35 (1H, d), 4.90 (1H, m), 3.37 (1H, m), 3.19 (1H, m), 1.71-1.28 (10H, brm). m/z (ES+, 70V) 523 (MH+).

EXAMPLE 78 Ethyl (2S)-3-{5-[(3,5-dichloroisonicotinoyl)amino]pyridin-2-yl}-2- {[ (2- (methylsulfanvl)-3-oxaspiror3. 51non-1-en-1-vl) aminopropanoate

Sulphuryl chloride (49L) was added dropwise to a stirred ice-bath cooled solution of dimethyl sulfide (74µL) in THF (5ml). The ice bath was removed and the solution stirred for 45 min. This solution was added to a stirred solution of the compound of Example 71 (700mg, 1.35mmol) in THF (10ml) and DCM (10ml) and stirred at RT. The reaction was worked up in a similar manner to that of Example 79 to give the title compound.

EXAMPLE 79 Ethyl (2S)-3-{5-[(3,5-dichloroisonicotinoyl)amino]pyridin-2-yl}-2- {[ (2- <BR> <BR> <BR> <BR> <BR> (isopropvlsulfanvl)-3-oxaspirof3. 51non-1-en-1-vl) aminolpropanoate.

Sulphuryl chloride (218AL) was added dropwise to a stirred ice-bath cooled solution of isopropyl disulphide (4321lL) in THF (10ml). The ice bath removed and the mixture stood for 35 min. 5ml of this solution was added to a stirred solution of the compound of Example 71 (700mg, 1.35mmol) in THF (10ml) and DCM (10ml) and stirred at RT for 15 min.

The solvent removed and the residue was partitioned between Et20 (130ml) and saturated sodium bicarbonate (30ml). The phases were separated and the organic layer was washed with brine (10ml), dried (Na2SO4) and evaporated in vacuo and the residue purified by chromatography (silica, 2-3% EtOH/DCM) to give the title compound as a white foam. m/z (ES+, 70V) 591 (MH+), EXAMPLE 80 <BR> <BR> <BR> <BR> <BR> Ethvl (2S)-3-f5-f (3, 5-dichloroisonicotinovl) aminolpvridin-2-vll-2-fr (4,<BR> <BR> <BR> <BR> <BR> <BR> <BR> 4-dimethvl-3-oxo-1-cvclobutenvl) aminolpropanoate To a solution of Intermediate 43 (792mg, 2.06mmol) in DCM (15ml) and THF (5ml) was added 2,2-dimethyl-1, 3-cyclobutanedione (0.27g, 2.41 mmol) with stirring for 24hr. After evaporation of the solvent the crude product was purified by chromatography (silica, 4-8% EtOH/DCM) to give the title compound as a white foam (926 mg, 93 %). 8H NMR (d6 DMSO), 8.78 (2H, s), 8.68 (1H, s), 8.53 (1H, d), 7.30 (1H, d), 4.38 (1H, s), 4.33

(1H, m), 4.11 (2H, q), 3.38-3.10 (2H, m), 1.14 (3H, t), 1.04 (3H, s), 0.94 (3H, s). m/z (ES+, 70V) 477 (MH+).

EXAMPLE 81 Ethyl (2S)-2- ( (2-bromo-4, 4-dimethyl-3-oxo-1-cvclobutenvl) aminol-3- {5-r(3,5-dichloroisonicotinovl) aminolpvridin-2-vlTpropanoate Prepared from the compound of Example 80 (600mg, 1.25mmol) in a similar manner to the method of Example 72 to give the title compound (530mg, 75%) as a white foam. 8H NMR (d6 DMSO) 9.20 (1H, s), 8.95 (2H, s), 8.87 (1 H, s), 8.20 (1H, d), 7.51 (1H, d), 5.19 (1H, m), 4.32 (2H, q), 3.53-3.30 (2H, m), 1.34 (3H, t), 1.26 (3H, s), 1.13 (3H, s). m/z (ES+, 70V) 556 (MH+).

EXAMPLE 82 Ethyl (2S)-2-f (2-bromo-4, 4-dimethvl-3-oxo-1-cvclobutenyl) aminol-3- {5-r(3,5-dichloroisonicotinovl) aminol-2-pvridinyllpropanoate hvdrochloride The compound of Example 81 was dissolved in EtOAc (10ml) and HCI gas bubbled through for a short time. The resulting white precipitate was collected by filtration, washed with EtOAc the Et20 and dried to give the title compound as a white powder (252mg). 8H NMR (d6 DMSO) 11.30 (1H, s), 9.12 (1H, d), 8.81 (2H, s), 8.80 (1H, s), 8.10 (1H, d), 7.43 (1H, d), 5.04 (1H, m), 4.18 (2H, q), 3.30 (2H, m), 1.20 (3H, t), 1.12 (3H, s), 1.00 (3H, s). m/z (ES+, 70V) 592 (MH+).

EXAMPLE 83 Ethyl (2S)-2-r (2-bromo-4, 4dimethvl-3-oxo-1-cvclobutenvl) aminol-3-f5- [ (3, 5-dichloroisonicotinovl) aminolpvridin-2-vllpropanoic acid The compound of Example 81 (200mg, 3.59mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a white amorphous solid (110 mg, 58 %). 8H NMR (d DMSO), 8.96 (1H, d),

8.81 (2H, s), 8.72 (1H, s), 8.04 (1H, d), 7.34 (1H, d), 4.96 (1H, m), 3.35- 3.15 (2H, m), 1.11 (3H, s), 0.96 (3H, s). m/z (ES+, 70V) 528 (MH+).

EXAMPLE 84 <BR> <BR> <BR> <BR> Ethyl (2S)-2-f (2-chloro-4, 4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-f5- r(3,5-dichloroisonicotinoyl)amino]pyridin-2-yl}propanoate A solution NCS (294mg, 2.20mmol) in dry DCM (10ml) was added to a solution of the compound of Example 80 (869mg, 1.82mmol) in THF (10ml) at between-10° to 10°with stirring for 1.5 hr. After 30 min the solvent was evaporated in vacuo and the residue purified by chromatography (silica, 4-8% EtOH/DCM) to give the title compound as a light yellow foam (786 mg, 84 %). 8H NMR (d6 DMSO) 11.18 (1 H, s), 9.02 (1 H, d), 8.83 (2H, s), 8.75 (1 H, s), 8.08 (1 H, d), 7.37 (1 H, d), 4.99 (1 H, m), 4.20 (2H, q), 3.40-3.21 (2H, m), 1.22 (3H, t), 1.13 (3H, s), 1.01 (3H, s). m/z (ES+, 70V) 511 (MH+).

EXAMPLE 85 <BR> <BR> <BR> <BR> (2S)-2-r (2-chloro-4, 4-dimethvl-3-oxo-1-cyclobutenvl) aminol-3-f5-f (3, 5- dichloroisonicotinovl) aminolpvridin-2-vllpropanoic acid The compound of Example 84 (560mg, 1.09mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as an off-white powder (370 mg, 70 %). 8H NMR (d6 DMSO) 11.17 (1H, s), 9.94 (1H, d), 8.83 (2H, s), 8.75 (1H, s), 8.06 (1H, d), 7.35 (1H, d), 4.91 (1H, m), 3.37-3.16 (2H, m), 1.12 (3H, s), 0.97 (3H, s). m/z (ES+, 70V) 483 (MH+).

EXAMPLE 86 Ethyl (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-[2-(1- <BR> <BR> <BR> <BR> methvl-pvridin-3-vl)-3-oxo-spirof3. 51non-1-en-1-vlaminol-propanoate iodide salt

To a stirred solution of the compound of Example 64 (126mg, 0. 21mmol) in DMF (1 ml) was added iodomethane (14mL, 0.23mmol). After 18 hrs the solvent was removed in vacuo to give the crude title compound which was used without further purification. m/z (ES+, 70V) 607.0 (MH+).

EXAMPLE 87 Ethyl (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-[2-(1- <BR> <BR> <BR> <BR> <BR> methvl-piperidin-3-vl)-3-oxo-spiror3. 51non-1-en-1-vlaminolpropanoate The compound of Example 86 (127mg, 0.21 mmol) was dissolved in EtOH (10ml) and hydrogenated over platinum dioxide (50mg) at room temperature and 1 atmosphere hydrogen for 5 days. The catalyst was removed by evaporation in vacuo to afford the title compound as a yellow oil (129mg, 100%). 8H NMR (d6 DMSO) 10.48 (1H, br s), 8.70 (2H, s), 7.59 (2H, d, J 8.1 Hz), 7.30 (2H, d, J 8.1 Hz), 4.25 (1H, m), 4.22 (2H, q, J 4. 0Hz), 3.23 (1H, m), 3.08 (1H, m), 1.70-1.50 (22H, m), 1.26 (3H, m). m/z (ES+, 70V) 613.2 (MH+).

EXAMPLE 88 (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-[2-(1- METHYL- piperidin-3-vl)-3-oxo-spiror3. 51non-1-en-1-ylaminolpropanoic acid The compound of Example 87 was hydrolyse in a similar manner to the method of Example 2. The product was purified by passage through a short column (RP-18-silica ; 5% aqueous acetonitrile) to give the title compound as a yellow solid (52%). 8H NMR (d6 DMSO) 10.47 (1 H, br s), 8.70 (2H, s), 7.57 (2H, d, J 7.7Hz), 7.27 (2H, d, J 7.7Hz), 4.13 (1H, m), 3.19 (1H, m), 3.02 (1H, m), 2.27 (3H, s), 1.70-1.30 (10H, m). m/z (ES+, 70V) 585.1 (MH+).

EXAMPLE 89 <BR> <BR> <BR> <BR> <BR> (2S)-Ethvl-2-[(2-chloro-3-oxo-7-oxa-sPirof3. 51non-1-en-1-vl) am i nol-3-<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> {4-r (3, 5-dichloroisonicotinovl) aminolphenvlpropanoate

A stirred solution of the compound of Example 38 (800mg, 1.54mmol) in THF (25mut), at rt was treated in several portions with N-chloro succinimide (226mg, 1.69mmol). After 1 h the crude reaction was partitioned between EtOAc (150ml) and brine (100moi). The organic layer was removed and washed with a further 100m ! of brine and the organic phase dried (MgS04), filtered and concentrated in vacuo. Chromatography (Si02 ; 50% EtOAc: hexanes) gave the title compound as a white powder (625mg, 1.13mmol, 67%). 8H (DMSO d6, 390K) 10.39 (1 H, br s), 8.69 (2H, s), 8.39 (1H, d, J 8.8Hz), 7.57 (2H, s), 7.29 (2H, d, J 8.4Hz), 4.72 (1H, m), 4.24 (2H, q, J 7. 1 Hz), 3.83-3.77 (2H, m), 3.73-3.62 (2H, m), 3.28 (1 H, dd, J 5.5, 14.2Hz), 2.04-1.93 (2H, m), 1.54-1.51 (1H, m), 1.44-1.42 (1H, m), 1.27 (3H, t, J 7.1Hz). m/z (ES+, 70V) 554 (MH+).

EXAMPLE 90 (2S)-2-[ (2-Chloro-3-oxo-7-oxa-spirof3. 51non-1-en-1-vl) am inol-3-f4- (3, 5-dichloroisonicotinovl)-aminolphenvllpropanoic acid Hydrolysis of the compound of Example 89 (525mg, 0.95mmol) with lithium hydroxide (80mg, 1. 7mmol), according to the method of Example 2, gave the title compound (412mg, 0.79mol, 83%). 8H (DMSO d6,390K) 10.40 (1 H, s), 8.68 (2H, s), 8.30 (1 H, br s), 7.55 (2H, d, J 5.8Hz), 7.27 (2H, d, J 5. 8Hz), 4.63 (1 H, m), 3.80-3.73 (2H, m), 3.69-3.61 (2H, m), 3.26 (1 H, dd, J 4. 9,14.1 Hz), 3.07 (1H, dd, J 9. 1,14.1 Hz), 1.97-1.90 (2H, m), 1.51- 1.48 (1 H, m), 1.40-1.37 (1 H, m). m/z (ES+, 70V) 524.0 (MH+).

EXAMPLE 91 <BR> <BR> <BR> <BR> <BR> (2S)-Ethvl-2-r (2-Chloro-3-oxo-spirof3. 61dec-1-en-1-vl) aminol-3-f4-<BR> <BR> <BR> <BR> <BR> <BR> <BR> [@(3, 5-dichloro-isonicotinovl)-aminol-phenvllpropanoate Was prepared according to the method of Example 89 from the compound of Example 45 (800mg, 1. 51mmol) and N-chloro succinimide (222mg, 1.66mmol) to give the title compound as a white powder (625mg, 1. 11mmol, 74%). 8H (DMSO d6,390K) 10.40 (1H, s), 8.70 (2H, s), 8.11

(1 H, s br), 7.57 (2H, s br), 7.29 (2H, d, J 8.3Hz), 4.68 (1 H, m), 4.24 (2H, q, J 7.1 Hz), 3.28 (1H. dd, J 5.5,14.3Hz), 3.12 (1H, dd, J 9.1,14.3Hz), 1.82- 1.52 (12H, m), 1.27 (3H, t, J 7. 1 Hz). m/z (ES+, 70V) 566.0 (MH+).

EXAMPLE 92 (2S)-2-r (2-Chloro-3-oxo-spiro[3.6]dec-1-en-1-yl)amino]-3-{4-[(3, 5- dichloroisonicotinovl) aminolphenvll-propanoic acid Hydrolysis of the compound of Example 91 (600mg, 1.07mmol) with lithium hydroxide (80mg, 1. 7mmol), according to the method of Example 2, gave the title compound (512mg, 0. 95mol, 89%). 8H (DMSO d6,390K) 10.37 (1H, s), 8.67 (2H, s), 7.52 (2H, m), 7.25 (2H, d, J 8.3Hz), 4.44 (1H, m), 3.22 (1H, dd, J 5.2,14. 0Hz), 3.13 (1H, dd, J 8.0,13.9Hz), 1.98-1.41 (12H, m). m/z (ES+, 70V) 536.0 (MH+).

EXAMPLE 93 <BR> <BR> <BR> <BR> (2S)-Ethvl-2-f4. 4-dimethyl-2- (1-methyl-1 H-tetrazol-5-visulfanyl)-3-oxo- cyclobut-1-enylamino]-3-{4-[ (3,5-dichloroisonicotinovl) aminol- phenvllpropanoate A stirred solution of the compound of Example 5 (1.03g, 2.16mmol) in THF (50ml) at rt, was treated with a slurry of 1-methyl-1 H-tetrazol-5- ylsulfanyl chloride (360mg, 2.4mmol) in DCM (2ml). After 30min the crude reaction was partitioned between EtOAc (150ml) and saturated aqueous sodium hydrogen carbonate solution (100ml). The organic phase was removed, washed with brine (100ml), dried (MgS04) and concentrated in vacuo. Chromatography (Si02 ; EtOAc) gave the title compound as a white powder (1.12g, 1.89mmol, 88%). 8H (DMSO d6, 390K) 10.40 (1H, s), 9.08 (1 H, d, J 2.6Hz), 8.67 (2H, s), 7.55 (2H, d, J 6.2Hz), 7.24 (2H, d, J 6.2Hz), 5.06 (1H, m), 4.17 (2H, q, j 7.1Hz), 4.05 (3H, s), 3.27 (1H, dd, J 5.5, 14.2Hz), 3.12 (1H, dd, J 8.9,14.2Hz), 1.23 (3H, s), 1.22 (3H, t, J 7. 1Hz), 1.20 (3H, s). m/z (ES+, 70V) 590.0 (MH+).

EXAMPLE 94 <BR> <BR> <BR> <BR> (2S)-2-f4, 4-Dimethyl-2- (1-methyl-1 H-tetrazol-5-visulfanyl)-3-oxo-<BR> <BR> <BR> <BR> <BR> <BR> <BR> cvclobut-1-envlaminol-3-f4-f (3, 5-dichloroisonicotinovl) aminol- phenyllpropanoic acid Hydrolysis of the compound of Example 93 (640mg, 1.08mmol) with lithium hydroxide (80mg, 1. 7mmol), according to the method of Example 2, gave the title compound (517mg, 0.92mol, 85%). 8H (DMSO d6,390K) 10.41 (1H, s), 9.35 (1H, d, J 2.6Hz), 8.67 (2H, s), 7.51 (2H, d, J 5.9Hz), 7.22 (2H, d, J 7.5Hz), 4.93 (1H, m), 3.97 (3H, s), 3.26 (1H, dd, J 5.5, 14.2Hz), 3.09 (1H, dd, J 8. 9,14.2Hz), 1.17 (3H, s), 1.10 (3H, s). m/z (ES+, 70V) 562.0 (MH+).

EXAMPLE 95 <BR> <BR> <BR> <BR> (2S)-Ethyl-2-[(3,7,7-trioxo-7#6-thia-spiro[3.5]non-1-en-1-yl )amino]-3-{4-<BR> <BR> <BR> <BR> <BR> <BR> <BR> [ (3, 5-dichloroisonicotinovl) aminolphenyll-propanoate Prepared from Intermediate 45 (1.1g, 5.4mmol) and the free base of Intermediate 27 (2.08mg, 5.5mmol), in a similar manner to the compound of Example 11 to give the title compound as a white powder (712mg, 1.25mmol, 23%). 8H (CDCl3, 300K) 8.51 (1 H, s), 8.33 (2H, s), 7.37 (2H, d, J 8.2Hz), 6.96 (2H, d, J 8.2Hz), 4.25 (1H, s), 4.10 (2H q, J 7.1 Hz), 4.01 (1H, m), 3.40-3.33 (2H, m), 3.06 (1H, dd, J 4.5,14.2Hz), 2.90 (1H, dd, J 14.1,8. 0Hz), 2.79-2.75 (2H, m), 2.38-2.31 (2H, m), 1.99-1.96 (1H, m), 1.86-1.81 (1H, m), 1.16 (3H, t, J 7.1Hz). m/z (ES+, 70V) 565.9 (MH+).

EXAMPLE 96 (2S)-Ethyl-2-[(2-bromo-3,7,7-trioxo-7#6-thia-spiro[3.5]non-1 -en-1- vl) aminol-3-f4-r (3, 5-dichloroisonicotinovl) aminolPhenvl}-Propanoate A solution of the compound of Example 95 (435mg, 0.77mmol) in THF (18ml) at 0# was treated portionwise with N-bromo succinimide (151mg, 0.85mmol). After 10min the reaction was partitioned between EtOAc (100ml) and saturated aqueous sodium hydrogencarbonate solution

(50ml), the organic phase removed, dried (MgS04) and concentrated in vacuo. Chromatography (Si02, 50% EtOAc: hexanes) gave the title compound as a white powder (411mg, 0.64mmol, 83%). 8H (DMSO d6, 390K) 10.43 (1H, s), 9.00 (1H, d, J 8.4Hz), 8.69 (2H, s), 7.58 (2H, d, J 6.8Hz), 7.28 (2H, d, J 6.8Hz), 4.85 (1H, m), 4.23 (2H, q, J 7.1 Hz), 3.37- 3.25 (3H, m, overlapping), 3.13-3.03 (3H, m, overlapping), 2.56-2.45 (2H, m), 2.09-1.89 (2H, m), 1.27 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 645.9 (MH+).

EXAMPLE 97 (2S)-2-r (2-Bromo-3, 7, 7-trioxo-7#6-thia-spiro[3.5]non-1-en-1-yl)amino]- 3-f4- (3q5-dichloroisonicotinovl) amino1phenvll-Propanoic acid Hydrolysis of the compound of Example 96 (410mg, 0.63mmol) with lithium hydroxide (31 mg, 0.7mmol), according to the method of Example 2, gave the title compound (371 mg, 0.60mol, 95%). 8H (DMSO d6,390K) 10.41 (1H, s), 9.35 (1H, d, J 2.6Hz), 8.69 (2H, s), 7.55 (2H, d, J 6.7Hz), 7.27 (2H, d, J 6.7Hz), 4.70 (1 H, m), 3.37-3.25 (5H, m), 3.05 (1 H, dd, J 5.4, 13.3Hz), 2.3 (2H, m), 2.02 (1H, m), 1.92 (1H, m). m/z (ES+, 70V) 617.8 (MH+).

EXAMPLE 98 <BR> <BR> <BR> <BR> <BR> (2S)-Ethyl-2-4, 4-dimethvl-2- (1-methvl-1 H-imidazol-2-visulfanyl)-3-oxo-<BR> <BR> <BR> <BR> <BR> <BR> <BR> cyclobut-1-envlaminol-3-f4-r (3, 5-<BR> <BR> <BR> <BR> <BR> <BR> <BR> dichloroisonicotinovl) aminolphenvl}-propanoate Prepared from the compound of Example 5 (1. 0g, 2. 1mmol) and 1-methyl- 1 H-imidazol-2-ylsulfenyl chloride (340mg, 2.3mmol), in a similar manner to the compound of Example 93 to give title compound as a white powder (1.03g, 1.75mmol, 83%). 8H (DMSO d6,390K) 10.84 (1H, s), 9.19 (1H, d, J 9.0Hz), 8.79 (2H, s), 7.53 (2H, d, J 8.5Hz), 7.23 (2H, d, J 8.5Hz), 7.21 (1H, d, J 1.1 Hz), 6.88 (1H, d, J 1.1 Hz), 5.46 (1H, m), 4.16 (2H, q, J 7.1Hz), 3.62 (3H, s), 3.26 (1H, dd, J 5.2,14.2Hz), 3.06 (1H, dd, J 8.9,14.2Hz),

1.20 (3H, t, J 7.1 Hz), 1.09 (3H, s), 0.97 (3H, s). m/z (ES+, 70V) 590.0 (MH+).

EXAMPLE 99 <BR> <BR> <BR> <BR> (2S)-2-r4, 4-Dimethyl-2- (1-methvl-1 H-imidazol-2-vilsulfanvl)-3-oxo-<BR> <BR> <BR> <BR> cvclobut-1-envlaminol-3-f4-r (3, 5-dichloroisonicotinovl)-aminol- phenvll-propanoic acid Hydrolysis of the compound of Example 98 (760mg, 1.29mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound (412mg, 0.74mol, 57%). 8H (DMSO d6, 390K) 10.83 (1H, s), 9.11 (1H, d, J 9. 0Hz), 8.79 (2H, s), 7.51 (2H, d, J 8.5Hz), 7.23 (2H, d, J 8.5Hz), 7.21 (1H, d, J 1.1 Hz), 6.90 (1H, d, J 1.1 Hz), 5.38 (1H, m), 3.63 (3H, s), 3.25 (1H, dd, J 5.2,14.2Hz), 3.05 (1H, dd, J 8.9, 14.2Hz), 1.07 (3H, s), 0.96 (3H, s). m/z (ES+, 70V) 562.0 (MH+).

EXAMPLE 100 <BR> <BR> <BR> <BR> (2S)-Ethyl-2-r (3-thioxo-spirof3. 51non-1-en-1-vl) aminol-3-f4-f (3, 5-<BR> <BR> <BR> <BR> dichloroisonicotinoVl) aminol-phenvlTpropanoate A solution of the compound of Example 27 (700mg, 1.36mmol) and Lawesson's reagent [2,4-bis (4-methoxyphenyl)-1, 2,3,4- dithiadiphosphetane 2,4-disulphide] (561 mg, 1.38mmol) in toluene (25ml) was heated to 80° for 24h. The crude reaction was then partitioned between EtOAc (100ml) and brine (100ml). The organic phase was separated, dried (MgS04) and concentrated in vacuo. Chromatography (Si02, EtOAc) gave the title compound as a yellow powder (621 mg, 1. 17mmol, 86%). 8H (DMSO d6,390K) 10.84 (1H, s), 8.96 (1H, d, J 8.9Hz), 8.78 (2H, s), 7.56 (2H, d, J 7.9Hz), 7.25 (2H, d, J 7.9Hz), 5.48 (1 H, s), 4.37 (1H, m), 4.18 (2H, q, J. 7.1Hz), 3.20 (1H, dd, J 4. 9,13.9Hz), 3.04 (1 H, dd, J 9.9,13.9Hz), 1.96-1.87 (2H, m), 1.63-1.42 (8H, m), 1.21 (3H, t, J 7. 1 Hz). m/z (ES+, 70V) 532.0 534.0 (MH+).

EXAMPLE 101 (2S)-2-f (3-Thioxo-spirof3. 51non-1-en-1-vl) aminol-3-f4-f (3, 5- dicloroisonicotinovl) aminolphenvl}-propanoic acid Hydrolysis of the compound of Example 100 (340mg, 0.66mmol) with lithium hydroxide (30mg, 0.67mol), according to the method of Example 2, gave the title compound (287mg, 0.57mol, 86%). 8H (DMSO d6,390K) 10.84 (1H, s), 8.87 (1H, d, J 8.8Hz), 8.77 (2H, s), 7.54 (2H, d, J 8.3Hz), 7.24 (2H, d, J 8.3Hz), 5.45 (1H, s), 4.23 (1H, m), 3.21 (1H, dd, J 4.4, 13.9Hz), 3.00 (1H, dd, J 9.9,13.9Hz), 1.96-1.87 (2H, m), 1.67-1.41 (8H, m). m/z (ES+, 70V) 562.0 (MH+).

EXAMPLE 102 (2S)-2-r (3-oxo-spiro f3. 41oct-1-en-1-vl) am i nol-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenvll-propanoate A solution of 3-hydroxy-spiro [3.4] oct-2-en-1-one (330mg, 2.39mmol) [prepared according to the method of Wasserman, H. H. et al J. Org.

Chem, 38,1451-1455, (1973)] and the free base of Intermediate 27 (911mg, 2.39mmol), in DCM (5ml), was stirred at rt for 48h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) to give the title compound as a white solid (1.03g, 2.05mmol, 86%). 8H (CDCl3, 300K) 8.97 (1 H, s), 8.41 (2H, s), 7.51 (2H, d, J 8.5Hz), 7.01 (2H, d, J 8.5Hz), 5.89 (1H, d, J 7.5Hz), 4.39 (1H, s), 4.21 (3H, obscured m), 3.15 (1H, dd, J 5.3,14. 0Hz), 3.03 (1H, dd, J 5.8,14. 0Hz), 1.74-1.49 (10H, m), 1.27 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 502.0 (MH+).

EXAMPLE 103 (2S)-2-f (3-Oxo-spiror3. 41oct-1-en-1-yl) aminol-3-f4-r (3. 5- dichloroisonicotinovl) aminol-phenvllpropanoic acid Hydrolysis of the compound of Example 102 (150mg, 0.30mmol) with lithium hydroxide (30mg, 0.67mmol), according to the method of Example 2, gave the title compound (112mg, 0. 23mol, 79%). 8H (DMSO d6,390K)

13.08 (1H, s), 10.87 (1H, s), 8.79 (2H, s), 8.39 (1H, d, J 8.5Hz), 7.57 (2H, d, J 8. 2Hz), 7.26 (2H, d, J 8.2Hz), 4.39 (1H, s), 4.14 (1H, m), 3.16 (1H, dd, J 4.7,13.8Hz), 2.98 (1H, dd, J 9.4,13.8Hz), 1.73-1.58 (10H, m). m/z (ES+, 70V) 473.9 (MH+).

EXAMPLE 104 (2S)-Ethyl-2-[(2-chlor-3-oxo-spiro[3.4]oct-1-en-1-yl)amino]- 3-{4-[(3, 5- dichloroisonicotinovl) aminolphenvll-propanoate Prepared from the compound of Example 102 (1.25g, 2.49 mmol) and N- chloro succinimide (333mg, 2.7mmol), according to the method of Example 61, to give the title compound as a white powder (1.13g, 2. 1mmol, 84%). 8H (DMSO d6,390K) 10.41 (1H, s), 8.68 (2H, s), 8.33 (1 H, d, J 5.9Hz), 7.57 (2H, m), 7.27 (2H, m), 4.66 (1 H, m), 4.21 (2H, q, J 7.1 Hz), 3.26 (1H, dd, J 5.3,14.1 Hz), 3.11 (1H, dd, J 9.0,14.1 Hz), 1.98- 1.58 (1 OH, m), 1.23 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 535.9 (MH+).

EXAMPLE 105 (2S)-2-r (2-Ch loro-3-oxo-spiror3. 41oct-1-en-1-vl) ami nol-3-f4-r (3, 5- dichloro-pyridine-4-carbonvl) aminolphenyll-propanoic acid Hydrolysis of the compound of Example 104 (1.10g, 2.05mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound (976mg, 1. 92mol, 94%). 8H (DMSO d6,390K) 10.41 (1 H, s), 8.69 (2H, s), 8.26 (1 H, s), 7.57 (2H, d, J 6.2Hz), 7.28 (2H, d, J 6.2Hz), 4.61 (1H, m), 3.26 (1H, dd, J 5.0,14.1 Hz), 3.08 (1H, dd, J 9.1, 14.1 Hz), 1.92-1.60 (10H, m). m/z (ES+, 70V) 509.9 (MH+).

EXAMPLE 106 (25)-Ethvl-2-r (2-bromo-3-oxo-sPiror3. 4loct-1-en-1-vl) amino1-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenvl}-propanoate A solution of the compound of Example 102 (1.25g, 2.49mmol) in THF (25ml) at rt was treated with N-bromo succinimide (443mg, 2.49mmol).

After 30min the reaction was diluted with EtOAc (100ml), washed with saturated aqueous sodium hydrogencarbonate solution (50m1) and the organic phase separated, dried (MgS04) and concentrated in vacuo.

Chromatography (Si02, EtOAc) gave the title compound as a white powder (1.27g, 2.18mmol, 87%). 8H (DMSO d6,390K) 10.43 (1H, s), 8.69 (2H, s), 8.42 (1 H, d, J 8.9Hz), 7.58 (2H, d, J 6.7Hz), 7.29 (2H, d, J 6.7Hz), 4.77 (1 H, s), 4.22 (2H, q, J 7.1 Hz), 3.26 (1 H, dd, J 5.4,14.1 Hz), 3.12 (1H, dd, J 9.0,14.1 Hz), 1.98-1.62 (8H, m), 1.25 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 582.0 (MH+).

EXAMPLE 107 (2S)-2-[(2-Bromo-3-oxo-sPiror3*4loct-1-en-1-vl) am ino1-3-84-r (3, 5- dichloroisonicotinovl) aminolphenvll-propanoic acid Hydrolysis of the compound of Example 106 (900mg, 1.54mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound (721 mg, 1.3mmol, 84%). #H (DMSO d6,390K) 10.39 (1 H, s), 8.68 (2H, s), 8.12 (1 H, s br), 7.54 (2H, d, J 8.2Hz), 7.27 (2H, d, J 8.2Hz), 4.64 (1 H, m), 3.25 (1 H, dd, J 5.1,14.1 Hz), 3.11 (1 H, dd, J 8.6, 14.1 Hz), 1.92-1.62 (8H, m). m/z (ES+, 70V) 553.9 (MH+).

EXAMPLE 108 <BR> <BR> <BR> <BR> (2S)-Ethvl-2-r (2-methvlsulfanyl-3-oxo-spirof3. 51non-1-en-1-vl) aminol- 3-{4-[(3,5-dichloroisonicotinoyl)amino]phenyl}propanoate A solution of the compound of Example 27 (1. 0g, 1.94mmol) in THF (25ml) at rt was treated dropwise with a solution of methanesulfenyl chloride in DCM (2.13moi, 1.0M) [prepared according to the method of Still, I. W. J., et al. J. Org. Chem., 1982, 47, 560]. After 20min the reaction was diluted with EtOAc (100m,l) and washed with saturated aqueous sodium hydrogencarbonate solution (50mut). The organic phase was separated, dried (MgS04), filtered and concentrated in vacuo. Chromatography (SiO2, 60% EtOAc: hexanes) gave the title compound as a white powder (1.03g,

1.83mmol, 94%). 8H (DMSO d6,390K) 10.86 (1H, s), 8.78 (2H, s), 8.70 (1 H, d, J 9.2Hz), 7.57 (2H, d, J 8.4Hz), 7.26 (2H, d, J 8.4Hz), 5.11 (1H, m), 4.18 (2H, q, J 7.1 Hz), 3.20 (1H, dd, J 4.6,13.9Hz), 3.00 (1H, dd, J 9.8, 13.9Hz), 1.93 (3H, s), 1.66-1.33 (10H, m), 1.21 (3H, t, J 7.1Hz). m/z (ES+, 70V) 562.1 (MH+).

EXAMPLE 109 <BR> <BR> <BR> <BR> (2S)-2-r (2-Methvlsulfanvl-3-oxo-spiror3. 51non-1-en-1-vl) aminol-3-f4- r(3,5-dichloroisonicotinoyl)aminlo]phenyl}-propanoic acid Hydrolysis of the compound of Example 108 (600mg, 1.07mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound as a white powder (421 mg, 0.79mmol, 73%).

8H (DMSO d6,390K) 10.84 (1H, s), 8.77 (2H, s), 8.44 (1H, d, J 8.8Hz), 7.54 (2H, d, J 8.4Hz), 7.23 (2H, d, J 8.4Hz), 4.90 (1 H, m), 3.19 (1H, dd, J 4.4,13.7Hz), 2.98 (1H, dd, J 9.1,13.7Hz), 1.93 (3H, s), 1.79-1.54 (8H, m), 1.36-1.22 (2H, m). m/z (ES+, 70V) 534.0 (MH+).

EXAMPLE 110 (2S)-Ethyl-2-r (2-fluoro-3-oxo-spirof 3. 51non-1-en-1-vl) am i nol-3-f 4-f (3, 5- dichloroisonicotinovl) aminolphenvll-propanoate A solution of the compound of Example 27 (2.02g, 3.91mmol) in THF (55moi) was treated with SelectfluorT" reagent (1.38g, 3.89mmol) and heated to 70°. After 48h the reaction was diluted with EtOAc (300moi) and washed with saturated aqueous sodium hydrogencarbonate solution (50ml). The organic phase was dried (MgS04), filtered and concentrated in vacuo. Chromatography (SiO2, 60% EtOAc: hexanes) gave the title compound as a white powder (1.87g, 3.50mmol, 89%). 8H (DMSO d6, 390K) 10.89 (1H, s), 8.81 (2H, s), 8.47 (1H, d, J 8.7Hz), 7.59 (12H, d, J 8.5Hz), 7.27 (2H, d, J 8.5Hz), 4.26 (1H, m), 4.19 (2H, q, J 7.1 Hz), 3.21 (1H, dd, J 4.9,13.8Hz), 2.98 (1H, dd, J 9.8,13.8Hz), 1.70-1.38 (10H, m), 1.22 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 534.1 (MH+).

EXAMPLE 111 (2S)-2-(2-Fluoro-3-oxo-spiro[3.5]non-1-en-1-ylamino)3-{4-[(3 , 5- dichloroisonicotinovl) aminolphenvl}-propanoic acid Hydrolysis of the compound of Example 110 (273mg, 0. 51mmol) with lithium hydroxide (60mg, 1. 3mmol), according to the method of Example 2, gave the title compound as a white powder (197mg, 0.39mmol, 76%).

8H (DMSO d6,390K) 10.87 (1H, s), 8.80 (2H, s), 8.30 (1H, d, J 8.7Hz), 7.58 (2H, d, J 8.2Hz), 7.25 (2H, d, J 8.2Hz), 4.15 (1H, m), 3.19 (1H, dd, J 4.5,13.8Hz), 2.96 (1H, dd, J 9.5,13.8Hz), 1.92-1.49 (8H, m), 1.37-1.16 (2H, m). m/z (ES+, 70V) 506.0 (MH+).

EXAMPLE 112 (2S)-2-[(2-Fluoro-3-oxo-7-oxa-sPirof3. 51non-1-en-1-vl) aminol-3-f4- [ (3, 5-dichloroisonicotinovl) aminolphenyll-propanoic acid A mixture of the compound of Example 38 (1. 0g, 1.93mmol) and Selectfluor reagent (1. 0g, 2.8mmol) in THF (25ml) was heated to reflux for 72h. The crude reaction was then diluted with EtOAc (100moi) and washed with saturated aqueous sodium hydrogencarbonate solution (50ml). The organic phase was dried (MgSO4), filtered and concentrated in vacuo to give a gum. This was then redissolved in THF (20moi) and treated with lithium hydroxide (80mg, 1.78mmol) and water (1ml) and stirred for 24h at rt. Acidification with a few drops of AcOH followed by concentration in vacuo and chromatography (Si02, 10: 90: 3: 2 MeOH : DCM: AcOH: H20) gave the title compound as a white powder (561 mg, 1. 1mmol, 57%). 8H (DMSO d6,390K) 10.89 (1H, s), 8.80 (2H, s), 8.58 (1H, d, J 8.8Hz), 7.59 (2H, d, J 8.4Hz), 7.27 (2H, d, J 8.4Hz), 4.23 (1H, m), 3.76 (2H, m), 3.60 (2H, m), 3.23 (1H, dd, J 4.4,13.9Hz), 2.96 (1H, dd, J 9. 8,13.9Hz), 1.98-1.93 (2H, m), 1.47 (1H, m), 1.30 (1H, m). m/z (ES+, 70V) 508.0 (MH+).

EXAMPLE 113 <BR> <BR> <BR> <BR> <BR> (2S)-2-(2-Fluoro-464-dimethvl-3-oxo-cvolobut-1-envlamino)-3- f4-r (3q5- dichloroisonicotinovl) aminolphenvl}-propanoic acid Prepared from the compound of Example 5 (1.25g, 2.49 mmol), SelectfluorTM reagent (1. 0g, 2.8mmol) and lithium hydroxide (80mg, 1.8mmol), according to the methods of Examples 61 and 2, to give the title compound as a white powder (1.13g, 2. 1mmol, 84%). #H (DMSO d6, 390K) 10.88 (1H, s), 8.80 (2H, s), 8.65 (1H, d, J 8.7Hz), 7.60 (2H, d, J 8.2Hz), 7.27 (2H, d, J 8.2Hz), 4.25 (1H, m), 3.22 (1H, dd, J 4.5,13.9Hz), 2.98 (1H, dd, J 9.3,13.9Hz), 1.11 (3H, s), 1.03 (3H, s). m/z (ES+, 70V) 466.0 (MH+).

EXAMPLE 114 <BR> <BR> <BR> <BR> <BR> (2S)-2-r (4, 4-Dimethvl-2-methylsulfanyl-3-oxo-cvclobut-1-envl) aminol- 3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvll-propanoic acid A solution of the compound of Example 5 (700mg, 1.47mmol) in THF (15ml) was treated at rt with a 1. OM solution of methanesulfenyl chloride in DCM (1.5moi, 1.5mmol). After 30min the reaction was partitioned between EtOAc (50ml) and saturated aqueous sodium hydrogencarbonate solution (25moi). Separation of the organic phase, followed by drying (MgSO4), filtration and concentration in vacuo gave a solid which was approx. 90% pure. The crude solid was redissolved in THF (20ml) and treated with lithium hydroxide (60mg, 1.3mmol) and water (1 ml) and stirred at rt for 24h. The reaction was acidified with a few drops of AcOH and concentrated in vacuo. Chromatography (Si02, 10: 90: 3: 2 MeOH: DCM: AcOH: H20) gave the title compound as a white powder (289mg, 0.59mmol, 40%). AH (DMSO d6,390K) 10.85 (1H, s), 8.87 (1H, d, J 9.2Hz), 8.80 (2H, s), 7.59 (2H, d, J 8. 0Hz), 7.29 (2H, d, J 8. 0Hz), 5.04 (1H, m), 2.25 (1H, dd, J 3.5,13.5Hz), 3.00 (1H, dd, J 9.8,13.5Hz), 2.00 (3H, s), 1.11 (3H, s), 1.02 (3H, s). m/z (ES+, 70V) 493.9 (MH+).

EXAMPLE 115 <BR> <BR> <BR> <BR> (2S)-2-r (2-Isopropvlsulfanvl-4, 4-dimethyl-3-oxo-cyclobut-1-<BR> <BR> <BR> <BR> <BR> <BR> <BR> envl) aminol-3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvll-propanoic acid Was prepared in two steps from the compound of Example 5 (700mg, 1.47mmol), a 1.0M solution of isopropyl sulfenyl chloride in DCM (1. 5ml, 1. 5mmol) and lithium hydroxide (80mg, 1. 8mmol), according to the method of Example 114, to give the title compound as a pale yellow powder (305mg, 0.58mmol, 39%). 8H (DMSO d6,390K) 13.24 (1H, s br), 10.87 (1H, s), 8.92 (1H, d, J 9.5Hz), 8.80 (2H, s), 7.58 (2H, d, J 8.4Hz), 7.28 (2H, d, J 8.4Hz), 5.16 (1 H, m), 3.22 (1 H, dd, J 3.9,13.8Hz), 2.97 (1 H, dd, J 9.7,13.8Hz), 2.67 (1H, m), 1.14 (3H, s), 1.06-1.04 (9H, m). m/z (ES+, 70V) 522.0 (MH+).

EXAMPLE 116 (2S)-Ethvl-2-[(2-lsopropvisulfanvl-3-oxo-spiror3. 51non-1-en-1- vl) aminol-3-f4-f (3, 5-dichloroisonicotinovl) aminolphenvl}-propanoate A stirred solution of the compound of Example 27 (1. 0g, 1.93mmol) in THF (50ml) at rt was treated dropwise with a 1.0M solution of isopropyl sulfenyl chloride in DCM until a yellow colouration of the reaction mixture just persisted. The reaction was then diluted with EtOAc (200ml) and washed with saturated aqueous sodium hydrogencarbonate solution (50ml). The organic phase was separated, dried (MgS04), filtered and concentrated in vacuo. Chromatography (Si02, 100% EtOAc) gave the title compound as a pale yellow powder (987mg, 87%). 8H (DMSO d6, 390K) 10.85 (1H, s), 8.79 (2H, s), 8.73 (1H, d, J 9.5Hz), 7.56 (2H, d, J 8.5Hz), 7.25 (2H, d, J 8.5Hz), 5.20 (1H, m), 4.17 (2H, q, J 7.1Hz), 3.18 (1H, dd, J 4.3,13.8Hz), 2.97 (1H, dd, J 10.2,13.8Hz), 2.65 (1H, m), 1.73- 1.57 (8H, m), 1.36-1.33 (1H, m), 1.21 (3H, t, J 7. 1Hz), 1.17-1.14 (1H, m), 1.02 (6H, d, J 6.6Hz). m/z (ES+, 70V) 590.0 (MH+).

EXAMPLE 117 <BR> <BR> <BR> <BR> <BR> (2S)-2-f (2-Isopropvisulfanvl-3-oxo-spiror3. 51non-1-en-1-vl) aminol-3- {4-[(3,5-dichloroisonicotinoyl)amino]phenyl}-propanoic acid Hydrolysis of the compound of Example 116 (400mg, 0.68mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound as a white powder (333mg, 0.59mmol, 89%).

8H (DMSO d6,390K) 10.84 (1H, s), 8.78 (2H, s), 8.62 (1H, d, J 9.4Hz), 7.55 (2H, d, J 8.1 Hz), 7.25 (1 H, d, J 8.1 Hz), 5.12 (1 H, m), 3.20 (1H, dd, J 3.6,13.7Hz), 2.94 (1H, dd, J 10.2,13.7Hz), 2.62 (1H, m), 1.91-1.64 (8H, m), 1.59-1.56 (1 H, m), 1.36-1.33 (1 H, m), 1.02 (6H, d, J 6.6Hz). m/z (ES+, 70V) 562.0 (MH+).

EXAMPLE 118 (2S)-Ethyl-2-f (2-isopropylsulfanvl-4, 4-dimethvl-3-oxo-cvclobut-1- envl) aminol-3-r4- (r2, 71naphthvridin-1-vlamino) phenvll propanoate A solution of 3-hydroxy-4,4-dimethyl-2-cyclobutenone (333mg, 2.97mmol) and Intermediate 12 (1. 0g, 2.98mmol) in THF (25mi), was stirred at rt for 48h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) affording 970mg of the coupled product of approx 90% purity. This intermediate was redissolved in THF (35ml) and treated with a 1.0M solution of isopropyl sulfenyl chloride in DCM (3. Oml, 3. Ommol) at rt. After 60min the reaction was diluted with EtOAc (100ml) and washed with saturated aqueous sodium carbonate solution (50ml), the organic phase was dried (MgS04), filtered and concentrated in vacuo. Chromatography (Si02, EtOAc) gave the title compound as a white powder (817mg, 1.62mmol, 54%). bH (DMSO d6,390K) 9.83 (1 H, s), 9.52 (1 H, s), 9.01 (1 H, d, J 9.4Hz), 8.65 (1 H, d, J 5.7Hz), 8.16 (1 H, d, J 5.7Hz), 7.81 (2H, d, J 8.5Hz), 7.68 (1H, d, J 5.7Hz), 7.23 (2H, d, J 8.5Hz), 7.13 (1H, d, J 5.7Hz), 5.24 (1H, m), 4.19 (2H, q, J 8.1Hz), 3.20 (1H, dd, J 4. 5, 13.8Hz), 2.97 (1H, dd, J 10.0,13.8Hz), 2.76 (1H, m), 1.22 (3H, t, J 7.1 Hz),

1.13 (3H, s), 1.05 (6H, d, J 6.7Hz), 1.04 (3H, s). m/z (ES+, 70V) 505.2 (MH+).

EXAMPLE 119 (2S)-2-[ (2-Isopropvlsulfanvl-4, 4-dimethvl-3-oxo-cvclobut-1- envl)aminol-3-r4- (f2, 71naphthyridin-1-vlamino) phenvll-propanoate Hydrolysis of the compound of Example 118 (400mg, 0.79mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound as a white powder (231 mg, 0.49mmol, 62%).

8H (DMSO d6,390K) 9.83 (1H, s), 9.51 (1H, s), 8.89 (1H, d, J 9.5Hz), 8.65 (1H, d, J 5.6Hz), 8.15 (1H, d, J 5.7Hz), 7.78 (2H, d, J 8.5Hz), 7.22 (2H, d, J 8.5Hz), 7.11 (1H, d, J 5.7Hz), 5.16 (1H, m), 3.21 (1H, dd, J 4. 1, 13.8Hz), 2.94 (1H, dd, J 6.7,13.8Hz), 2.75 (1H, m), 1.13 (3H, s), 1.06 (6H, d, J 6.6Hz), 1.03 (3H, s). m/z (ES+, 70V) 477.1 (MH+).

EXAMPLE 120 (2S)-Ethyl-2-f (2-isopropvlsulfanvl-3-oxo-spiror3. 51non-1-en-1- vl) aminol-3-r4- (r2, 71naphthvridin-1-vlamino) phenvil-propanoate Was prepared in two steps from Intermediate 12 (1. 0g, 2.98mmol), 1-keto- 3-hydroxyspiro [3,5]-non-2-ene (452mg, 2.97mmol) [prepared according to the method of Wasserman, H. H. et al, J. Org. Chem., 38,1451-1455 (1973)] and a 1. OM solution of isopropyl sulfenyl chloride in DCM (3.5mi, 3.5mmol) according to the method of Example 118 to give the title compound as a yellow powder (931 mg, 1. 71mmol, 58%). (DMSO d6, 390K) 9.89 (1H, s), 9.58 (1H, s), 8.82 (1H, d, J 9.4Hz), 8.71 (1H, d, J 5.6Hz), 8.21 (1 H, d, J 5.6Hz), 7.85 (2H, d, J 8.3Hz), 7.74 (1 H, d, J 5.6Hz), 7.28 (2H, d, J 8.3Hz), 7.18 (1H, d, J 5.6Hz), 5.31 (1H, m), 4.24 (2H, q, J 7. 1Hz), 3.24 (1H, dd, J 4.1,13.7Hz), 3.03 (1H, dd, J 10.3,13.7Hz), 2.80 (1 H, m), 1.80-1.71 (8H, m), 1.46-1.43 (1 H, m), 1.28 (3H, t, J 7.1 Hz), 1.24- 1.21 (1 H, m), 1.11 (6H, d, J 6. 5Hz). m/z (ES+, 70V) 545.2 (MH+).

EXAMPLE 121 <BR> <BR> <BR> (2S)-2-r (2-Isopropylsulfanyl-3-oxo-spirof3. 51non-1-en-1-vl) aminol-3-f4- (r2q7lnaphthvridin-1-vlamino)-nhenvll-propanoic acid Hydrolysis of the compound of Example 120 (900mg, 1.62mmol) with lithium hydroxide (150mg, 3.3mmol), according to the method of Example 2, gave the title compound as a bright yellow powder (790mg, 1.53mmol, 94%). 8H (DMSO d6,390K) 9.83 (1H, s), 9.51 (1H, s), 8.67 (1H, d, J 5.6Hz), 8.65 (1 H, d, J 5.6Hz), 8.15 (1 H, d, J 5.7Hz), 7.77 (2H, d, J 8. 4Hz), 7.68 (1H, d, J 5.7Hz), 7.23 (2H, d, J 8. 4Hz), 7.12 (1 H, J 5. 7Hz), 5.20 (1H, m), 3.22 (1H, dd, J 3.9,13.8Hz), 2.94 (1H, dd, J 10.4,13.8Hz), 1.79-1.66 (8H, m), 1.40-1.35 (1H, m), 1.20-1.15 (1H, m), 1.05 (3H, d, J 6. 3Hz), 1.03 (3H, d, J 6.3Hz). m/z (ES+, 70V) 517.2 (MH+).

EXAMPLE 122 <BR> <BR> <BR> <BR> (2S)-Ethyl-2-r (2-isopropyisulfanyl-3-oxo-7-oxa-spiror3. 51non-1-en-1- vl) aminol-3-r4- (f2, 71naphthyridin-1-vlamino)-phenyll-propanoate Was prepared in two steps from Intermediate 12 (1.96g, 5.8mmol), 7- oxaspiro [3.5] nonane-1,3-dione (1. Og, 6.5mmol) [prepared according to the method of Wasserman, H. H. et al, J. Org. Chem., 38,1451-1455 (1973)] and a 1.0M solution of isopropyl sulfenyl chloride in DCM (5. 4ml, 5.4mmol) according to the method of 118 to give the title compound as a yellow powder (1.15g, 2. 1mmol, 36%). 8H (DMSO d6,390K) 9.83 (1H, s), 9.52 (1 H, s), 8.94 (1 H, d, J 9.5Hz), 8.65 (1 H, d, J 5.6Hz), 8.15 (1 H, d, J 5.7Hz), 7.78 (2H, d, J 8.5Hz), 7.68 (1H, d, J 5.6Hz), 7.23 (2H, d, J 8.5Hz), 7.12 (1H, d, J 5.7Hz), 5.26 (1H, m), 4.19 (2H, q, J 7.1Hz), 3.81-3.76 (2H, m), 3.64-3.55 (2H, m), 3.20 (1H, dd, J 4.3,13.8Hz), 2.96 (1H, dd, J 10.3, 13.8Hz), 2.81-2.74 (1H, m), 2.06-1.93 (2H, m), 1.50-1.47 (1H, m), 1.32- 1.28 (1H, m), 1.23 (3H, t, J 7. 1Hz), 1.07 (3H, d, J 6.6Hz), 1.05 (3H, d, J 6.6Hz). m/z (ES+, 70V) 547.2 (MH+).

EXAMPLE 123 (2S)-2-[(2-Isopropylsulfanyl-3-oxo-7-oxa-spiro[3.5]non-1-en- 1 vl) aminol-3-f4- (f2, 71naphthvridin-1-vlamino)-phenvil-propanoic acid Hydrolysis of the compound of Example 122 (906mg, 1.66mmol) with lithium hydroxide (150mg, 3.3mmol), according to the method of Example 2, gave the title compound as a pale yellow powder (801mg, 1.54mmol, 93%). 8H (DMSO d6,390K) 9.82 (1H, s), 9.51 (1H, s), 8.86 (1H, d, J 9.5Hz), 8.65 (1 H, d, J 5.5Hz), 8.14 (1 H, d, J 5.6Hz), 7.76 (2H, d, J 8.1 Hz), 7.68 (1H, d, J 5.5Hz), 7.28 (2H, d, J 8.1 Hz), 7.12 (1H, d, J 5.6Hz), 5.24- 5.19 (1H, m), 3.78 (2H, m), 3.61 (2H, m), 3.21 (1H, dd, J 3.5,13.8Hz), 2.91 (1H, dd, J 10.7,13.8Hz), 2.77-2.71 (1H, m), 2.05-1.91 (2H, m), 1.49- 1.46 (1 H, m), 1.30-1.26 (1 H, m), 1.07 (3H, s), 1.03 (3H, s). m/z (ES+, 70V) 519.1 (MH+).

EXAMPLE 124 (2S)-Ethvl-2-[(3-oxo-sPirof3. 4locta-1, 6-dien-1-vl) amino1-3-f4-r (3, 5- dichloroisonicotinovl) aminolphenvlTpropanoate A solution of Intermediate 47 (1. 0g, 7.3mmol) and the free base of Intermediate 27 (2.48g, 7.3mmol), in DCM (25moi), was stirred at room temperature for 48h. The volatiles were removed in vacuo and the residue chromatographed (Si02 ; EtOAc) to give the title compound as a white solid (2.14g, 4.28mmol, 59%). 8H (CDCI3, 300K) 9.02 (1H, s), 8.38 (2H, s), 7.49 (2H, d, 8.5Hz), 7.00 (2H, d, J 8.5Hz), 6.03 (1 H, d, J 7.8Hz), 5.54 (2H, s), 4.41 (1H, s), 4.21 (2H, q, J 7.1Hz), 4.20 (1H, m), 3.15 (1H, dd, J 5.2,14. 0Hz), 3.03 (1H, dd, J 6.1,14. 0Hz), 1.56-1.51 (2H, m), 2.38-2.34 (2H, m), 1.18 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 500.0 (MH+).

EXAMPLE 125 (2s)-2-[(3-Oxo-spiro[3,4]octa-1,6-dien-1-yl)amino]-3-{4-[(3, 5- dichloroisonicotinovl) aminolphenvll-propanoic acid

Hydrolysis of the compound of Example 124 (970mg, 1.94mmol) with lithium hydroxide (100mg, 2.2mmol), according to the method of Example 2, gave the title compound (896mg, 1.90mol, 98%). 6H (DMSO d6,390K) 10.87 (1H, s), 8.80 (2H, s), 8.45 (1H, d, J 8. 4Hz), 7.57 (2H, d, J 8.5Hz), 7.27 (2H, d, J 8.5Hz), 5.63 (2H, s), 4.41 (1H, s), 4.11 (1H, m), 3.17 (1H, dd, J 4.8,13.9Hz), 2.98 (1H, dd, J 9.3,13.9Hz), 2.46-2.42 (2H, m), 2.36- 2.25 (2H, m). m/z (ES+, 70V) 471.9 (MH+).

EXAMPLE 126 <BR> <BR> <BR> <BR> (2S)-Ethyl-2- ( (2-bromo-3-oxo-spiror3. 41octa-1, 6-dien-1-vl) aminol-3-f4-<BR> <BR> <BR> <BR> <BR> <BR> f (3, 5-dichloroisonicotinovl) aminolphenyll-propanoate Bromination of the compound of Example 124 (206mg, 0. 41mmol) with N- bromo succinimide (75mg, 0.57mmol), according to the method of Example 36 afforded the title compound as a white solid (116mg, 0.20mmol, 50%). 8H (DMSO d6,390K) 10.36 (1H, s), 8.67 (2H, s), 8.45 (1H, d, J 9. 0Hz), 7.58 (2H, d, J 8.5Hz), 7.28 (2H, d, J 8.5Hz), 5.67-5.63 (2H, m), 4.50 (1 H, s br), 4.23 (2H, q, J 7.1 Hz), 3.28 (1 H, dd, J 6.3, 14.1 Hz), 3.15 (1H, dd, J 9.0,14.1 Hz), 2.52-2.42 (4H, m), 1.28 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 579.0 (MH+).

EXAMPLE 127 (2S)-2-[(2-Bromo-3-oxo-spiro[3.4]octa-1,6-dien-1-yl)amino]-3 -{4-[(3, 5- dichloroisonicotinovl) aminolphenvl-propanoic acid Hydrolysis of the compound of Example 126 (190mg, 0.33mmol) with lithium hydroxide (60mg, 1. 3mmol), according to the method of Example 2, gave the title compound (162mg, 0.29mol, 88%). 8H (DMSO d6,390K) 10.89 (1H, s), 9.09-9.04 (1H, m), 8.81 (2H, s), 7.62 (2H, d, J 8.5Hz), 7.29 (2H, d, J 8.5Hz), 5.69-5.60 (2H, m), 4.72 (1H, m), 3.03 (1H, dd, J 9.0, 14.1 Hz), 2.98 (1H, dd, J 6.7,14.1 Hz), 2.62-2.20 (4H, m). m/z (ES+, 70V) 551.8 (MH+).

EXAMPLE 128 (2S)-Ethvl-2-r (4, 4-dimethvl-3-oxo-2-pentafluorophenvlsulfanyl- cyclobut-1-enyl)amino]-3-{4-[(3, 5- dichloroisonicotinovl) aminolphenvll-propanoate Was prepared from the compound of Example 5 (500mg, 1.06mmol) and pentafluorophenyl sulphenyl chloride (273mg, 1.17mmol), according to the method of Example 93 to give the title compound as a white powder (459mg, 0.68mmol, 64%). 8H (CDC13, 300K) ; 8.41 (2H, s), 7.41 (2H, d, J 8.4Hz), 6.99 (2H, d, J 8.4Hz), 5.98 (1H, d, J 8,8Hz), 5.18-5.12 (1H, m), 4.12 (2H, q, J 7.1Hz), 3.17 (1H, dd, J 5.6,14. 1Hz), 3.10 (1H, dd, J 5.7, 14.1 Hz), 1.18 (3H, t, J 7. 1Hz), 1.03 (3H, s), 1.01 (3H, s). m/z (ES+, 70V) 673.9 (MH+).

EXAMPLE 129 (2S)-2-[(4,4-Dimethyl-3-oxo-2-pentafluorophenylsulfanyl-cycl obut-1- <BR> <BR> <BR> <BR> envl) aminol-3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvl-propanoic acid Hydrolysis of the compound of Example 128 (440mg, 0.65mmol) with lithium hydroxide (60mg, 1. 4mmol), according to the method of Example 2, gave the title compound (372mg, 0.57mmol, 88%) as a white powder.

8H (DMSO d6,390K) 13.75 (1H, br s), 10.62 (1H, s), 9.16 (1H, d, J 9.5Hz), 8.54 (2H, s), 7.30 (2H, d, J 8.5Hz), 6.97 (2H, d, J 8.5Hz), 4.83- 4.77 (1H, m), 3.0 (1H, dd, J 4.1,14. 0Hz), 2.71 (1H, dd, J 10.0,14. 0Hz), 0.83 (3H, s), 0.75 (3H, s). m/z (ES+, 70V) 645.9 (MH+).

EXAMPLE 130 <BR> <BR> <BR> <BR> (2S)-Ethvl-2- (4, 4-dimethvl-3-oxo-2-pyrazin-2-yl-cyclobut-1-envlamino)- 3-{4[(3,5-dichloroisonicotinovl) aminolphenyll-propanoate A solution containing vinyl iodide (500mg, 0.81 mmol), palladium dichloride (14mg), triphenyl arsine (101mg), 2-tributylstannyl 1, 4-pyridazine (307mg), and copper iodide (15mg) in DMF was heated to 95° for 3h. The reaction

was then diluted with saturated aqueous sodium hydrogencarbonate solution (50ml) and EtOAc (loom). The organic phase was removed, dried (MgS04), filtered and concentrated in vacuo. Chromatography (Si02, 50% EtOAc: hexanes) gave the title compound (127mg, 0.23mmol, 28%). 8H (CDCl3, 330K) 9.51 (1 H, s), 8.72 (1 H, s), 8.26 (1 H, m), 8.11 (1 H, d, J 2.7Hz), 7.97 (1H, d, J 10.9Hz), 7.54 (2H, d, J 8.5Hz), 4.24-4.15 (3H, m), 3.18 (1H, dd, J 5.2,13.9Hz), 3.11 (1H, dd, J 4. 6,13.9Hz), 1.23 (3H, t, J 7. 1 Hz), 1.22 (3H, s), 0.98 (3H, s). m/z (ES+, 70V) 554.1 (MH+).

EXAMPLE 131 <BR> <BR> <BR> <BR> <BR> (2S)-2-[(4e4-Dimethvl-3-oxo-2-pvrazi n-2-vl-cvelobut-1-envl) am inol-<BR> <BR> <BR> <BR> <BR> <BR> <BR> 3-f49 (3q5-dichloroisonicotinovl) aminolphenvl}-propanoate Hydrolysis of the compound of Example 130 (50mg, 0.09mmol) with lithium hydroxide (10mg, 0.23mmol), according to the method of Example 2, gave the title compound (33mg, 0.064mmol, 71%) as a white powder.

LCMS indicates the presence of two separate atropisomers. 8H (DMSO d6,390K, 1 atropisomer) 10.49 (1 H, s), 8.90 (1 H, br m), 8.69 (2H, s), 8.42 (1 H, br m), 8.21 (1 H, br m), 7.43 (2H, d, J 8.3Hz), 7.21 (2H, d, J 8.3Hz), 5.95 (1 H, br s), 4.20 (1 H, m), 3.27-3.22 (1 H, m), 3.06 (1 H, m), 1.28 (3H, s), 1.19 (3H, s). m/z (ES+, 70V) 526.0 (MH+).

EXAMPLE 132 <BR> <BR> <BR> <BR> <BR> (2S)-Ethvl-2-f (4-methvl-3-oxo-4-phenvl-cyclobut-1-envl) aminol-3-f4- r (3, 5-dichloroisonicotinovl) aminolphenyll-propanoate Prepared from Intermediate 49 (300mg, 1.72mmol) and the free base of Intermediate 27 (400mg, 1.04mmol), in a similar manner to the compound of Example 11, to give the title compound as a white powder (329mg, 0. 61mmol, 59%) as an approx. 1: 1 mixture of diastereomers. 8H (CDCL3, 300K) 10.95 (1H, s), 10.88 (1H, s), 8.89 (1H, d, J 8.6Hz), 8.81 (2H, s), 8.80 (2H, s), 8.74 (1H, d, J 8.8Hz), 7.63 (2H, d, J 8.5Hz), 7.59 (2H, d, J 8.5Hz), 7.34-7.10 (5H, m), 6.89 (2H, d, J 8.5Hz), 6.85 (2H, d, J 8.5Hz),

4.71 and 4.66 (1H, s), 4.48-4.42 and 4.38-4.33 (1H, m), 4.21 (2H, t, J 7.1 Hz), 3.31-3.01 (2H, m), 1.52 and 1.42 (3H, s), 1.25 (3H, t, J 7. 1 Hz). m/z (ES+, 70V) 537.9 (MH+).

EXAMPLE 133 (2S)-Ethvl-2-f (4-methvl-3-oxo-4-phenvi-cyclobut-1-envl) aminol-3-f4- [ (3, 5-dichloroisonicotinovl) aminolphenvll-propanoate The compound of Example 132 (100mg, 0.18mmol) was hydrolyse in a similar manner to the method of Example 2 to give the title compound as a fine white solid (79mg, 0.15mmol, 86%) as an approx. 1: 1 mixture of diastereomers. 8H (DMSO d6,360K) 10.95 and 10.88 (1H, s), 8.82 and 8.81 (2H, s), 8.65 (1 H, d, J 8.7Hz), 7.63 and 7.59 (2H, d, J 8.5Hz), 7.23- 7.10 (5H, m), 6.88 and 6.85 (2H, d, J 8.5Hz), 4.70 and 4.63 (1H, s), 4.36- 4.25 and 4.25-4.22 (1 H, m), 3.31-3.00 (2H, m), 1.41 and 1.25 (3H, s). m/z (ES+, 70V) 509.9 (MH+).

EXAMPLE 134 (2S)-Ethvl-2-r (7-acetvl-2-bromo-3-oxo-7-aza-spirof3. 51non-1-en-1- vl) aminol-3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvll-propanoate A solution of the compound of Example 51 (100mg, 0.18mmol) in THF (10ml) at rt was treated with N-bromo succinimide (32mg, 0.19mmol).

After 30min the reaction was diluted with EtOAc (50ml) and saturated aqueous sodium hydrogencarbonate solution (30m1), the organic phase separated and dried (MgS04), filtered and concentrated in vacuo.

Chromatography (Si02, EtOAc) gave the title compound as a white powder (79mg, 0. 12mmol, 67%). 8H (CDCl3, 300K) 9.54 (1 H, s), 8.65 (1 H, d, J 9.4Hz), 8.19 (2H, s), 7.49 (2H, d, J 8.4Hz), 7.07 (2H, d, J 8.4Hz), 4.91-4.81 (1 H, m), 4.11 (2H, q, J 7. 1 Hz), 3.49-3.44 (1 H, m), 3.25-2.66 (5H, m), 1.89 (3H, s), 1.86-1.25 (4H, m), 1.18 (3H, t, J 7. 1Hz). m/z (ES+, 70V) 639.0 (MH+).

EXAMPLE 135 (2S)-2-r (7-Acetyl-2-bromo-3-oxo-7-aza-spi ror3. 51non-1-en-1-vl) am inol- 3-f4-r (3. 5-dichloroisonicotinovl) aminolphenvi-propanoic acid The compound of Example 134 (50mg, 0.078mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (21 mg, 0.034mmol, %). 8H (DMSO d6,390K) 10.38 (1H, s), 8.96 (2H, s), 7.57 (2H, s br), 7.28 (2H, d, J 7.9Hz), 4.78 (1H, m), 3.99- 3.96 (2H, m), 3.30-3.06 (4H, m), 2.00 (3H, s), 1.94-1.84 (2H, m), 1.48-1.21 (2H, m). m/z (ES+, 70V) 610.9 (MH+).

EXAMPLE 136 Ethyl (2S) 2- (2-benzvl-4, 4-dimethvl-3-oxo-cyclobut-1-enylamino)-3-f4- [(3,5-dichloro-isonicotinoyl)amino]-phenyl} propanoate A solution of the free acid of Intermediate 27 (0.82g, 2. 1mmol) and Intermediate 72 (0.48g, 2.3mmol, 1.1eq.) in nitromethane (8ml) was treated with acetic acid (1 drop). The resulting mixture was heated at 100° for 2h. and then partitioned between EtOAc (50ml) and water (25ml), the organics were separated, washed with water (25ml), Na2CO3 (25ml, sat. aq.), brine (25ml), dried (Na2SO4), filtered and concentrated in vacuo to give a crude foam. This was purified by column chromatography (Si02, gradient elution 1: 1, hexane: EtOAc to EtOAc) to give the title compound as a white solid (0.71 g, 59%). 6H NMR (DMSO d6, 400MHz) 10.87 (1 H, s), 8.81 (2H, s), 8.38 (1H, d, J 9.3Hz), 7.53 (2H, d, J 8.4Hz), 7.33 (2H, m), 7.15 (2H, m), 7.09 (2H, d, J 8.5Hz), 7.03 (2H, d, J 7.2Hz), 4.15 (1H, m), 4.04 (2H, dq, J 1.6,7.1 Hz), 3.19 (2H, m), 3.04 (1H, dd, J 13.8,5. 0Hz), 2.89 (1 H, dd, J 9.5,4.8Hz), 1.02-1.26 (8H, m). m/z (ESI, 70V) MH+ 566.

EXAMPLE 137 2-(2-Benzyl-4,4-dimethyl-3-oxo-cyclobut-1-enylamino)-3-{4-[( 3, 5- dichloroisonicotinovl) am i nol-phenvllpropanoic acid

To a solution of the compound of Example 136 (210mg, 0.4mmol) in THF (2ml) was added a solution of lithium hydroxide hydrate (25mg, 0.6mmol, 1. 5eq) in water (1 ml). The solution was stirred at room temperature for 3h.

The reaction mixture was concentrated in vacuo and the residue re- dissolved in water (15ml) and washed with diethyl ether (10moi). The aqueous was concentrated to approx. 5ml and taken to pH 4 with HCI (2M, aq.). The resulting solid was filtered, washed on the sinter with water, diethyl ether and dried in vacuo to give the title compound as a white solid (170mg, 85%). 8H (400MHz, DMSO d6, 380K) 10.42 (1 H, br), 8.70 (2H, s), 7.64 (1H, d, J 9.4Hz), 7.52 (2H, d, J 6.6Hz), 7.25 (2H, m), 7.13-7.18 (5H, m), 4.13 (1H, m), 3.26 (2H, d, J 2. 9Hz), 3.13 (1H, dd, J 14.0,4.9Hz), 2.97 (1H, dd, J 14.0,9.0Hz), 1.12 (3H, s), 1.09 (3H, d, J 15.7Hz). m/z (ESI, 70V) MH+ 538.

EXAMPLE 138 Isopropyl (2S) 2-(2-Bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4- f (3. 5-dichloroisonicotinovl) aminolphenvl} propanoate To a solution of the compound of Example 32 (0.5g, 0.9mmol) in DMF (5ml) was added EDC (185mg, 1.1eq), HOBT (135mg, 1. 1eq and isopropanol (0. 5ml). The mixture was stirred at room temperature for 48h. then partitioned between EtOAc (100ml) and water (50ml). The aqueous was separated and the organics washed with water (5 x 30ml), brine (30ml), dried (Na2SO4), filtered and concentrated in vacuo to give a crude solid. The crude was triturated with diethyl ether to give the title compound as a white powder (0.35g, 65%) 8H NMR (300MHz, DMSO d6) 10.69 (1 H, br), 8.68 (1H, d, J 9.1 Hz), 8.60 (2H, s), 7.39 (2H, d, J 8.5Hz), 7.08 (2H, d, J 8.5Hz), 4.78 (1H, sep, J 6.3Hz), 4.53 (1H, m), 3.01 (1H, dd, J 4.9, 13.8Hz), 2.83 (1H, dd, J 9.5,13.9Hz), 1.36-1.60 (9H, m), 1.19 (1H, d, J 12.7Hz), 0.98-1.05 (6H, dd). m/ (ESI, 70V) MH+ 608.

EXAMPLE 139 (2S) 2-(2-Bromo-3-oxo-spir9o[3.5]non-1-en-1-vlamino)-3-{4-[(3, 5- dichloro-isonicotinovl) aminolphenvllpropanoic acid 1-methyl- piperidin-4-vl ester Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol), EDC (185mg, 1. 1eq), HOBT (135mg, 1. 1eq), 4-hydroxy-1-methylpiperidine (0.5moi) and DMF (2ml) was prepared the title compound (0.21 g, 36%). 8H NMR (300MHz, DMSO d6) 11.01 (1 H, br), 9.01 (1 H, d, J 9.4Hz), 8.92 (2H, s), 7.71 (2H, d, J 8.5Hz), 7.40 (2H, d, J 8.5Hz), 4.90 (1 H, br), 3.33 (1 H, dd, J 13. 8,4.8Hz), 3.16 (1H, dd, J 13.8,9.6Hz), 2.55 (2H, br), 2.40 (2H, br), 2.24 (3H, d, J 8. 0Hz), 1.64-1.95 (12H, m), 1.50 (2H, d, J 12.1 Hz), 1.23 (2H, br). m/z (ESI, 70V) MH+ 664.

EXAMPLE 140 (2S) 2-(2-Bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3,5- dichloroisonicotinovl) aminolphenvl} propanoic acid cvclopentyl ester Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol, EDC (600mg, 3eq), HOBT (400mg, 3eq), cyclopentanol (0. 5ml) and DMF (5ml)] was prepared the title compound. 8H NMR (400MHz, DMSO d6) 10.88 (1H, s), 8.85 (1H, d, J 9. 0Hz), 8.78 (2H, s), 7.58 (2H, d, J 8.5Hz), 7.26 (2H, d, J 8.5Hz), 5.15 (1H, m), 4.71 (1H, m), 3.18 (1H, dd, J 5.2,13.9Hz), 3.02 (1H, dd, J 9.5,13.9Hz), 1.17-1.84 (18H, m), 1.14 (1H, m). m/z (ESI, 70V) MH+ 634.

EXAMPLE 141 (2S) 2- (2-Bromo-3-oxo-spirof3. 51non-1-en-1-vlamino)-3-f4-f (3, 5- dichloro-isonicotinovl) aminolphenvlTpropanoic acid tetrahvdro- furan-3-vl ester

Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 acid (0.5g, 0.89mmol), EDC (600mg, 3eq), HOBT (400mg, 3eq), (S)-3-hydroxytetrahydrofuran (0. 5ml) and dimethylformamide (5ml)] was prepared the title compound.

#H NMR (300MHz, DMSO d 6) 8.87 (1H, d, J 8.9Hz), 8.79 (2H, s), 7.58 (2H, d, J 8.4Hz), 7.27 (2H, d, J 8.5Hz), 5.30 (1H, m), 4.77 (1H, m), 3.72- 3.83 (3H, m), 3.65 (1H, d, J 10.4Hz), 3.20 (1H, dd, J 14.0,5.1 Hz), 3.04 (1H, dd, J 14.0,9.7Hz), 2.11-2.27 (1H, m), 1.87-1.99 (1H, m), 1.37-1.78 (9H, m), 1.07-1.17 (1 H, m). m/z (ESI, 70V) MH+ 636.

EXAMPLE 142 <BR> <BR> <BR> <BR> <BR> 2- (2-Bromo-3-oxo-spirof3. 51non-1-en-1-vlam i no)-3-f4-[ (3, 5-dichloro- isonicotinovl) aminolphenyllpropanoic acid 1-methyl-pyrrolidin-3-vl ester Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol), EDC (600mg, 3eq), HOBT (400mg, 3eq), 1-methyl-3-pyrrolidinol (0. 6ml) and DMF (5ml) was prepared the title compound. 8H NMR (400MHz, DMSO d6) 10.88 (1 H, s), 8.87 (1 H, d, J 9.0Hz), 8.78 (2H, s), 7.58 (2H, d, J 8.3Hz), 7.26 (2H, d, J 8.5Hz), 5.13 (1H, m), 4.74 (1H, m), 3.16 (1H, m), 3.04 (1H, m), 2.43-2.73 (2H, m), 2.07-2.26 (2H, m), 1.55-1.75 (11H, m), 1.11 (1H, m). m/z (ESI, 70V) MH+ 649.

EXAMPLE 143 <BR> <BR> <BR> <BR> <BR> 2- (2-Bromo-3-oxo-spiror3. 51non-1-en-1-vlamino)-3-f4-r (3, 5-dichloro- pyridine-4-carbonyl)-amino]-phenyl}-propanoic acid phenyl ester Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol, EDC (500mg, 2.6eq), HOBT (350mg, 2.6eq), phenol (0.5g) and DMF (5ml)] was prepared the title compound (0.17g, 29%). 8H (300MHz, DMSO d 6) 11.10 (1H, br)), 9.24 (1H, d, J 8.8Hz), 8.98 (2H, s), 7.81 (2H, d, J 8.5Hz), 7.47-

7.67 (5H, c), 7.31 (2H, dd, J 8.4,0.9Hz), 6.93 (1H, d, J 8.1 Hz), 5.20 (1H, br), 3.59 (1H, dd, J 9.3,6. 0Hz, 3.40 (1H, dd, J 14.0,9.3Hz), 1.60-1.97 (10H, m). m/z (ESI, 70V) MH+ 644.

EXAMPLE 144 2-(2-Bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3,5- dichloroisonicotinovl) aminolphenvlpropanoic acid pyridin-4-ylmethyl ester Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.60g, 1. 1mmol), EDC (222mg, 1.1 eq), HOBT (162mg, 1. 1eq), 4-pyridinemethanol (0.36g, 3.2mmol) and DMF (5ml)] was prepared the title compound (0.48g, 66%).

8H NMR (400MHz, DMSO d6, 380K) 10.43 (1H, br), 8.69 (2H, s), 8.57 (2H, d, J 6. 0Hz), 8.38 (1 H, d, J 8.1 Hz), 7.57 (2H, m), 7.30 (4H, m), 5.26 (2H, s), 4.95 (1H, br), 3.32 (1H, dd, J 14.2,5.4Hz), 3.17 (1H, dd, J 14.1,9. 1Hz), 1.46-1.71 (9H, m), 1.21 (1 H, br m). m/z (ESI, 70V) MH+ 657.

EXAMPLE 145 Methvl (2S) 2-f (3-oxo-7-oxaspirof3. 51non-1-en-vl) aminol-3- (2, 6- dimethoxvr1, 1'-biphenvil-4-vl) propanoate Using a similar procedure to that for the preparation the compound of Example 38 from methyl (2S)-2-amino-3-(2, 6-dimethoxy [1,1'-biphenyl]-4- yl) propanoate (2.0g, 6.3mmol) and 7-oxaspiro [3.5] nonane-1,3-dione (1.1g, 1. 1eq) in DCM (30ml) was prepared the title compound as a white foam (2.4g, 86%). 8H NMR (300MHz, DMSO d 6) 8.53 (1H, d, J 8.7Hz), 7.20- 7.30 (3H, m), 7.08 (2H, d, J 8.1 Hz), 6.70 (2H, d, J 8.5Hz), 4.44 (1H, s), 4.30 (1H, m), 3.72 (3H, s), 3.61 (6H, s), 3.22 (1H, dd, J 13.7,5. 0Hz), 2.98 (1H, dd, J 13.8,10.1 Hz), 1.74-1.99 (2H, m), 1.48 (1H, d, J 13.6Hz), 1.31 (1 H, d, J 13.0Hz). m/z (ESI, 70V) MH+ 439.

EXAMPLE 146 Methyl (2S) 2-{[2-(isopropylsulfanyl)-3-oxo-7-oxaspiro[3.5]non-1-en- yl) ]amino}-3-(2,6-dimethoxy[1,1'-biphenyl]-4-yl)propanoate The title compound was prepared in a similar manner to the compound of Example 70 from the bromo derivative of the compound of Example 145 (0.5g, 1. 1mmol) as a white foam (0.42g, 73%). 8H NMR (400MHz, DMSO d6) 8.91 (1H, d, J 9.4Hz), 7.29-7.21 (3H, m), 7.09 (2H, d, J 8.2Hz), 6.70 (2H, d, J 8.4Hz), 5.32 (1 H, br), 3.74-3.80 (5H, m), 3.54-3.64 (8H, m), 3.28 (1H, dd, J 4.2,16.4Hz), 2.97 (1H, dd, J 10. 8, '13. 6Hz), 2.76 (1H, sep, J 6.7Hz), 1.99 (1H, dt, J 11. 5,4.8Hz), 1.84 (1H, dt, J 4. 8,13. 0Hz), 1.48 (1H, d, J 12. 1 Hz), 1.25 (1H, d, J 12. 2Hz), 1.05 (3H, d, J 6.7Hz), 1.02 (3H, d, J 6.7Hz). m/z (ESI, 70V) MH+ 526.

EXAMPLE 147 Ethyl (2S) 2-r (4, 4,-dimethvl-3-oxo-1-cyclobutenvl) aminol-3- (2, 6- dimethoxyfl, 1'-biphenvil-4-vl) propanoate The title compound was prepared in a similar manner to that of the compound of Example 41 from ethyl (2S)-2-amino-3- (2, 6-dimethoxy [1,1'- biphenyl]-4-yl) propanoate (1.5g, 4. 5mol), and 3-hydroxy-4,4-dimethyl-2- cyclobutenone (0.5g, 4.5mmol) in DCM (15ml) as a white foam (1.8g, 93%). 8H NMR (300MHz, DMSO d6) 8.68 (1 H, d, J 8.6Hz), 7.22-7.37 (3H, m), 7.18 (2H, d, J 8.3Hz), 6.78 (2H, d, J 8.4Hz), 4.46 (1 H, s), 4.32 (1 H, m), 4.21 (2H, q, J 7.1Hz), 3.69 (6H, s), 3.24 (1 H, dd, J 13.8,5.9Hz), 3.09 (1 H, dd, J 13.8,9. 1Hz), 1.24 (3H, t, J 7. 1Hz), 1.16 (3H, s), 1.08 (3H, s). m/z (ESI, 70V) MH+ 424.

EXAMPLE 148 Ethyl (2S) 2-fr2-(isopropylsulfanvl)-4, 4,-dimethvl-3-oxo-1- cyclobutenyl]amino}-3-(2,6-dimethoxy[1,1'-biphenyl]-4-yl) propanoate The title compound was prepared in a similar manner to the compound of Example 70 as a white foam (0.52g, 87%). 8H NMR (400MHz, DMSO d,

380K) 8.99 (1H, d, J 9. 5Hz), 7.21-7.29 (3H, m), 7.10 (2H, d, J 8.1 Hz), 6.70 (2H, d, J 8.4Hz), 5.29 (1H, m), 4.17 (2H, q, J 7.1 Hz), 3.60 (6H, s), 3.23 (1H, dd, J 13.8,5.0Hz), 2.99 (1H, dd, J 13.8,10.4Hz), 2.79 (1H, sep, J 6.6Hz), 0.99-1.25 (15H, m). m/z (ESI, 70V) MH+ 498.

EXAMPLE 149 (2S) 2-fr2- (isopropylsulfanvl)-3-oxo-7-oxaspirof3. 51non-1-en-vl) ]amino}-3-(2,6-dimethoxy[1,1'-biphenyl]-4-yl propanoic acid Prepared from the compound of Example 146 (0.25g, 0.46mmol) in a similar manner to that of Example 2 to give the title compound as a white powder (0. 21g, 89%). 6H NMR (400MHz, DMSO d6) 8.80 (1H, d, J 9.5Hz), 7.21-7.28 (3H, m), 7.08 (2H, d, J 8.1 Hz), 6.70 (2H, d, J 8.4Hz), 5.25 (1H, m), 3.76 (2H, m), 3.59 (8H, m), 3.30 (1H), 2.93 (1H, dd, J 10.9,13.6Hz), 2.76 (1 H, sep, J 6.8Hz), 1.99 (1 H, m), 1.86 (1 H, m), 1.46 (1 H, d, J 13.1 Hz), 1.23 (1H, d, J 12.7Hz), 1.06 (3H, d, J 7.8Hz), 1.03 (3H, d, J 7.8Hz). m/z (ESI, 70V) MH+ 512.

EXAMPLE 150 (2S) 2-f f2- (isopropvisulfanyl)-4, 4,-dimethvl-3-oxo- 1-cvclobutenvilaminol-3- (2, 6-dimethoxvfl, 1'-biphenyll-4-yl) propanoic acid Prepared from the compound of Example 148 (0.31g, 0.64mmol) in a similar manner to that of Example 2 to give the title compound as a white powder (0.13g, 44%). 8H NMR (400MHz, DMSO d6) 08. 85 (1H, br d), 7.21-7.29 (3H, m), 7.08 (2H, d, J 8. 0Hz), 6.70 (2H, d, J 8.4Hz), 5.15 (1H, br), 3.61 (6H, s), 3.91 (1H, dd, J 13.7,8.6Hz), 2.77 (1H, sep), 0.98-1.14 (6H, m). m/z (ESI, MH+) 470.

EXAMPLE 151 <BR> Ethyl (2S)-2-r (2-Cvclohexyl-3-oxospirof3. 51non-1-en-1-vl) aminol-3-f4- [(3,5-dichloroisonicotinoyl)amino]phenyl} propanoate

A mixture of the free amine of Intermediate 27 (1000mg, 2. 61mm9ol), Intermediate 52 (611 mg, 2.61 mmol) and nitromethane (1 Oml) were heated at reflux for 5 hours. The solvent was removed by evaporation under reduced pressure and the residue chromatographed (Si02, 3: 2 hexane: EtOAc), to afford the title compound as a colorless oil (310mg, 20%). 8H NMR (CDC13) 8.51 (2H, s), 7.80 (1 H, br s), 7.52 (2H, d, J 8.5Hz), 7.07 (2H, d, J 8.5Hz), 5.15 (1H, d, J 7.6Hz), 4.32 (1H, m), 4.20 (2H, q, J 7.1 Hz), 3.07 (2H, d, J 5. 6Hz), 1.75-1.40 (20H, m), 1.19 (3H, t, J 7.1Hz).

EXAMPLE 152 (2S) 2-r (2-Cvclohexvl-3-oxo-spirof3. 51non-1-en-1-vl) aminol-3-4-f (3, 5- dichloroisonicotinovl) aminolphenvl} propanoic acid The compound of Example 151 was hydrolyse by the method of Example 2, giving the title compound in 78% yield. #H NMR (d6 DMSO) 10.84 (1 H, br s), 8.78 (2H, s), 7.60 (1 H, s), 7.56 (2H, d, J 8.2Hz), 7.25 (2H, d, J 7.9Hz), 4.06 (1 H, m), 3.12 (1 H, dd, J 3.9,13.6Hz), 2.92 (1 H, dd, J 9.8, 13.4Hz), 1.80-1.00 (21 H, m). m/z (ES+, 70V) 570.1 (MH+) EXAMPLE 153 Ethyl (2S) 3-f4-r (3, 5-dichloroisonicotnoyl)amino]phenyl}-2-(2,4,4- trimethvl-3-oxo-cvclobut-1-envlamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 59 to give the title compound in 70% yield. 8H NMR (CDCl3) 8.78 (1 H, br s), 8.44 (2H, s), 7.52 (2H, d, J 8.4 Hz), 7.04 (2H, d, J 8.3Hz), 5.55 (1H, d, J 9. 0Hz), 4.39 (1H, m), 4.20 (2H, q, J 7.1Hz), 3.07 (2H, m), 1.41 (3H, s), 1.26 (3H, t, J 7.1 Hz), 1.05 (6H, s). m/z (ES+, 70V) 490.0 (MH+).

EXAMPLE 154 (2S) 3-for (3,5-Dichloroisonicotinovl) aminolphenvl-2- (2, 4, 4-trimethyl- 3-oxo-cvclobut-1-enylamino) propanoic acid

The compound of Example 153 was hydrolyse by the method of Example 2 to afford the title compound in 69% yield. 6H NMR (d6 DMSO) 7.86 (2H, s), 6.82 (2H, d, J 8.5Hz), 6.54 (2H, d, J 8.5Hz), 3.69 (1H, m), 2.57 (1H, m), 2.25 (1H, m), 0.68 (3H, s), 0.38 (3H, s), 0.29 (s, 3H). m/z (ES+, 70V) 462.0 (MH+).

EXAMPLE 155 Ethvl (2S) 3-f4-f (3, 5-Dichloroisonicotinovl) aminolphenvl}-2- (2-ethyl- 4,4-dimethyl-3-oxo-cvclobut-1-enylamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 60 to give the title compound in 73% yield. 8H NMR (d6 DMSO) 8.78 (2H, s), 8.13 (1H, d, J 9.0Hz), 7.59 (2H, d, J 8.4Hz), 7.30 (2H, d, J 8.3Hz), 4.25 (1H, m), 4.17 (2H, q, J 7. 0Hz), 3.12 (1H, m), 3.00 (1H, m), 1.83 (2H, m), 1.20 (4H, m), 1.06 (3H, m), 0.98 (3H, s), 0.84 (3H, t, J 7.5Hz). m/z (ES+, 70V) 504.0 (MH+).

EXAMPLE 156 (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-ethyl-4, 4- dimethvl-3-oxo-cvclobut-1-enylamino) propanoic acid The compound of Example 155 was hydrolyse by the method of Example 2 to afford the title compound in 78% yield. 8H NMR (d6 DMSO) 7.83 (2H, s), 6.81 (2H, d, J 8.5Hz), 6.51 (2H, d, J 8.4Hz), 3.52 (1H, m), 2.51 (1H, m), 2.21 (1H, m), 1.10 (2H, q, J 7.3Hz), 0.36 (3H, s), 0.26 (3H, s), 0.10 (3H, t, J 7.5Hz). m/z (ES+, 70V) 476.0 (MH+).

EXAMPLE 157 Ethyl (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(4,4- dimethvl-3-oxo-2-propvl-cyclobut-1-envlamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 61 to give the title compound in 75% yield. 8H NMR (d6 DMSO) 8.80 (2H, s), 8.11 (1H, d, J 9.3Hz), 7.59 (2H, d, J 8.3Hz), 7.30

(2H, d, J 8.3Hz), 4.26 (1H, m), 4.15 (2H, q, J 7.1Hz), 3.12 (1H, m), 3.00 (1 H, m), 1.75 (2H, m), 1.23 (2H, m), 1.07 (3H, s), 0.99 (3H, s), 0.73 (3H, t, J 7.3Hz). m/z (ES+, 70V) 518.0 (MH+).

EXAMPLE 158 (2S) 3-f4-r (3, 5-Dichloroisonicotinovl) aminolphenvll-2- (4, 4-dimethyl-3- oxo-2-propvl-cvclobut-1-enylamino) propanoic acid The compound of Example 157 was hydrolyse by the method of Example 2 to afford the title compound in 93% yield. #H NMR (d6 DMSO) 8.78 (2H, s), 8.05 (1H, d, J 9.2Hz), 7.58 (2H, d, J 8.3Hz), 7.30 (2H, d, J 8.3Hz), 4.15 (1H, m), 3.13 (1H, m), 2.95 (1H, m), 1.75 (2H, m), 1.23 (2H, q, J 7.3Hz), 1.06 (3H, s), 0.98 (3H, s), 0.72 (3H, t, J 7.3Hz). m/z (ES+, 70V) 490.0 (MH+).

EXAMPLE 159 Ethvl (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-methyl 3-oxo-spirof3. 51non-1-en-1-ylamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 64 to give the title compound in 68% yield. 8H NMR (d DMSO) 8.79 (2H, s), 7.93 (2H, d, J 8.9Hz), 7.58 (2H, d, J 8.4Hz), 7.29 (2H, d, J 8.4Hz), 4.33 (1H, m), 4.16 (2H, q, J 7.1Hz), 3.10 (1H, m), 2.99 ( (1H, m), 1.60 (10H, m), 1.37 (3H, s), 1.18 (3H, t, J 7. 1 Hz). m/z (ES+, 70V) 530.1 (MH+).

EXAMPLE 160 (2S) 3-4-r (3, 5-Dichloroisonocotinovl) aminolphenvll-2- (2-methyl-3- oxo-spiror3. 51non-1-en-1-ylamino) propanoic acid The compound of Example 159 was hydrolyse by the method of Example 2 to afford the title compound in 86% yield. aH NMR (d6 DMSO) 8.82 (2H, s), 7.81 (1H, d, J 9.1 Hz), 7.57 (2H, d, J 8.4Hz), 7.30 (2H, d, J

8.4Hz), 4.28 (1H, m), 3.13 (1H, m), 2.96 (1H, m), 1.70-1.49 (8H, m), 1.38 (3H, s), 1.14 (2H, m). m/z (ES+, 70V) 501.9 (MH+).

EXAMPLE 161 Ethyl (2S) 3-f4-r (3, 5-Dichloroisonicotinovl) aminolphenvll-2- (3-oxo-2- propyl-spiror3. 51non-1-en-1-vlamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 65 to give the title compound in 76% yield. 8H NMR (CDCl3) 8.58 (2H, s), 8.44 (1H, s), 7.65 (2H, d, J 8.5Hz), 7.16 (2H, d, J 8.4Hz), 5.38 (1H, m), 4.46 (1H, m), 4.30 (2H, q, J 7.1Hz), 3.17 (2H, m), 1.85- 1.42 (14H, m), 1.38 (3H, t, J 7.1 Hz), 0.90 (3H, t, J 7.3Hz). m/z (ES+, 70V) 558.1 (MH+).

EXAMPLE 162 (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(3-oxo-2-pr opyl- spiror3. 51non-1-en-1-vlamino) propanoic acid The compound of Example 161 was hydrolyse by the method of Example 2 to afford the title compound in 84% yield. 8H NMR (d6 DMSO, 380K) 10.42 (1H, br s), 8.69 (2H, s), 7.57 (2H, d, J 7.3Hz), 7.28 (d, 2H, J 8.3Hz), 7.12 (1H, d, J 9. 1Hz), 4.21 (1H, m), 3.20 (1H, dd, J 4.9,14. 0Hz), 3.06 (1H, dd, J 8.8,14. 0Hz), 1.87 (2H, m), 1.72-1.45 (10H, m), 1.36 (2H, m), 1.23 (1H, m), 0.82 (3H, t, J 7. 4Hz). m/z (ES+, 70V) 530.1 (MH+).

EXAMPLE 163 Ethyl (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-methyl- 3-oxo-7-oxa-spirof3. 51non-1-en-1-vlamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 68 to give the title compound in 71% yield. 8H NMR (d6 DMSO) 8.80 (2H, s), 8.11 (1H, d, J 9.1Hz), 7.59 (2H, d, J 8.4Hz), 7.30 (2H, d, J 8.4Hz), 4.38 (1H, m), 4.17 (2H, q, J 7.1Hz), 3.75 (2H, m), 3.60

(2H, m), 3.15 (1H, dd, J 5.1,13.7Hz), 2.99 (1H, dd, J 9.2,13.6Hz), 1.90 (2H, m), 1.39 (3H, s), 1.19 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 532.0 (MH+).

EXAMPLE 164 (2S) 3-f4-f (3, 5-Dichloroisonicotinovl) aminolphenvl-2- (2-methyl-3- oxo-7-oxa-spirof3. 51non-1-en-1-vlamino) propanoic acid The compound of Example 163 was hydrolyse by the method of Example 2 to afford the title compound in 89% yield. aH NMR (d6 DMSO) 8.81 (2H, s), 8.05 (1H, d, J 9.2Hz), 7.60 (2H, d, J 8.4Hz), 7.32 (2H, d, J 8.4Hz), 4.25 (1H, m), 3.75 (2H, m), 3.58 (2H, m), 3.13 (1H, dd, J 4.6, 13.8Hz), 2.98 (1H, dd, J 9.5,13.8Hz), 1.94 (2H, m), 1.40 (3H, s), 1.29 (2H, m). m/z (ES+, 70V) 504.0 (MH+).

EXAMPLE 165 Ethyl (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(3-oxo-2- propyl-7-oxa-spirof3. 51non-1-en-1-vlamino) propanoate Prepared in a similar manner to the compound of Example 151 from Intermediate 69 to give the title compound in 59% yield. 8H NMR (d6 DMSO) 8.78 (2H, s), 8.08 (1H, d, J 8.8Hz), 7.55 (2H, d, J 8.4Hz), 7.29 (2H, d, J 8.5Hz), 4.23 (1H, m), 4.16 (2H, q, J 7.1Hz), 3.76 (2H, m), 3.58 (2H, m), 3.15 (1H, dd, J 4.8,13.6Hz), 2.98 (1H, dd, J 9.7,13.6Hz), 1.80 (2H, m), 1.18 (6H, m), 0.73 (3H, t, J 7. 4Hz). m/z (ES+, 70V) 560.0 (MH+).

EXAMPLE 166 Ethyl (2S) 3-{4-[ (3, 5-Dichloroisonicotinovl) aminolphenyll-2- (3-oxo-2- propyl-7-oxa-siro[3.5]non-1-en-1-ylamino) propanoate The compound of Example 165 was hydrolyse by the method of Example 2 to afford the title compound in 82% yield. aH NMR (d6 DMSO, 380K) 10.39 (1 H, br s), 8.68 (2H, s), 7.57 (2H, m), 7.33 (3H, m), 4.23 (1 H, m), 3.70 (4H, m), 3.21 (1 H, dd, J 4.8,14. 0Hz), 3.04 (1 H, dd, J 9.0,

14. 0Hz), 2.10 (1H, s), 1.88 (4H, m), 1.87 (3H, t, J 7. 0Hz), 1.40 (4H, m). m/z (ES+, 70V) 532.1 (MH+).

EXAMPLE 167 (2S) 2-(2-Bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3, 5- dichloroisonicotinoyl)amino]phenyl}-propanoic acid 2-imidazol-1-vl- ethyl ester Prepared in a similar manner to the compound of Example 138 from N-2- hydroxyethylimidazole [prepared according to the method of Yoshino et al, J. C. S. Perkin Trans. 1,1977,1266-72] to give the title compound in 48% yield. 8H NMR (d DMSO) 10.88 (1H, s), 8.88 (1H, d, J 9.1 Hz), 8.79 (2H, s), 7.66 (1H, s), 7.58 (2H, d, J 8.5Hz), 7.29 (2H, d, J 8.5Hz), 6.89 (1H, s), 4.84 (1H, m), 4.39 (2H, m), 4.29 (2H, m), 3.16 (1H, dd, J 4.6,13.9Hz), 2.96 (1H, dd, J 9. 7,13.9Hz), 1.75-1.45 (8H, m), 1.35 (1H, m), 1.13 (1H, m). m/z (ES+, 70V) 662.1 (MH+).

EXAMPLE 168 2-(2-Bromo-3-oxo-7-oxa-spiro[3.5]non-3-en-1-ylamino)-3-{4-[( 3- methyl-[2,7]naphthyridine-1-yl)amino]phenyl}propanoic acid Prepared by the methods as described herein in 77% yield. 8H NMR (d6 DMSO) 8.77 (1H, s), 7.67 (1H, d, J 6.3Hz), 6.96 (2H, d, J 8.5Hz), 6.78 (1H, d, J 5. 8Hz), 6.45 (2H, d, J 8.5Hz), 6.14 (1H, s), 4.19 (1H, m), 3.05- 2.85 (4H, m), 2.59 (1H, dd, J 4.4,14. 0Hz), 2.25 (1H, dd, J 9.7,13.9Hz), 1.66 (3H, s), 1.28 (1H, m), 1.16 (1H, m), 0.83 (1H, d, J 13.5Hz), 0.66 (1H, d, J 13.5Hz). m/z (ES+, 70V) 537.9 (MH+).

EXAMPLE 169 Ethyl 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-[1,3]dit hian- 2-yl-3-oxo-spiro[3.5]non-1-en-1-ylamino) propanoate To a solution of the compound of Example 27 (1.5g, 2.9mmol) in DCM (1 00mi) was added 1,3-dithienium tetrafluorborate (3g, 14mmol) [prepared

by the method of Paterson I ; Price L. G. Tet. Lett. 1981,22 (29), 2829]. The mixture was stirred overnight and then partitioned between EtOAc (200ml) and sodium carbonate (100ml, sat. aq.), the organics were separated, washed with water (3 x 50ml), brine (50ml), dried (Na2SO4), filtered and concentrated in vacuo to give a crude product which was purified by column chromatography (Si02 : 4: 1, EtOAc: hexane) to give the title compound as a pale yellow solid (0.6g, 86%) 8H NMR (400MHz, d6 DMSO, 300K) 08. 67 (2H, s), 8.15 (1H, d, J 9.5Hz), 7.67 (2H, d, J 8.5Hz), 7.12 (2H, d, J 8.5Hz), 5.06 (1H, m), 4.65 (1H, s), 1.10 (1H, m), 4.08 (2H, t, J 7.1 Hz), 3.17-2.72 (3H, m), 2.65 (2H, m), 1.95 (1H, m), 1.87 (1H, m), 1.78-1.46 (11 H, m), 1.25 (1 H, d, J 12. 3Hz). m/z (ESI, 70V) MH+ 634.

EXAMPLE 170 (2S) 3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2-[1,3]dit hian- 2-yl-3-oxo-spiror3. 51non-1-en-1-vlamino) propanoic acid To a solution of the compound of Example 169 (0.25g, 0.4mmol) in THF (2ml) was added a solution of lithium hydroxide (25mg, 0.6mmol) in water (1 ml). The mixture was stirred at room temperature overnight, concentrated in vacuo and the residue dissolved in the minimum amount of water. HCI (2M, aq.) was added until the pH of the solution was 4, the resulting solid was filtered, washed with ether and ethyl acetate to give the product as a pale yellow solid (0.15g, 63%). 6H NMR (400MHz, d DMSO, 300K) #10. 85 (1H, s), 8.78 (2H, s), 8.28 (1H, d, J 9.9Hz), 7.55 (2H, d, J 8.5Hz), 7.31 (2H, d, J 8.5Hz), 5.06 (1H, m), 4.75 (1H, s), 3.21-2.78 (3H, m), 2.67 (2H, m), 1.99 (1H, m), 1.75 (1H, m), 1.57 (8H, m), 1.22 (1H, d, J 11.9Hz), 1.08 (1 H, m). m/z (ESI, 70V) MH+ 606.

EXAMPLE 171 Ethvl (2S)-3-{4-[(3,5-Dichloro-1-oxy-pyridine-4-carbonyl)amino]- <BR> <BR> <BR> phenvll-2- (2-methanesulfinvl-4, 4-dimethyl-3-oxo-cvclobut-1-<BR> <BR> <BR> <BR> <BR> <BR> envlamino) propanoate

A solution of the compound of Example 5 (800mg, 1.68mmol) in THF (20ml) was treated at rt with a solution of methanesulfenyl chloride in DCM (1. 9ml, 1.0M). After 30min the reacton was partitioned between EtOAc (50ml) and saturated aqueous sodium hydrogencarbonate (25ml).

Separation of the organic phase, drying (MgS04), filtration and concentration in vacuo gave a solid which was approx. 90% pure. The crude solid was redissolved in DCM (20ml) and treated with m-CPBA (1.5g, 57-75% purity) and sodium hydrogencarbonate (500mg) and stirred at rt for 24h. The reaction was diluted with EtOAc (100ml), washed with H2O (50mut), separated, dried (MgS04), filtered and concentrated in vacuo.

Chromatography (Si02, EtOAc) gave the title compound as a white powder (730mg, 1. 31mmol, 78%) as an approx. 1: 1 mixture of diastereomers. #H (CDC13, 330K) 8.44 and 8.41 (2H, s), 8.35 and 8.17 (1H, s), 7.57 and 7.47 (2H, d, J 8.4Hz), 7.15 and 7.08 (2H, d, J 8.4Hz), 7.04 and 7.01 (1H, d, J 8.9Hz), 5.24-5.22 (1H, m), 4.25-4.11 (3H, m), 3.31-3.05 (2H, m), 2.97 and 2.93 (3H, s), 1.30-1.16 (9H, m). m/z (ES+, 70V) 553.9 and 556.0 (MH+).

EXAMPLE 172 <BR> <BR> <BR> <BR> 2S)-3-84-r (3, 5-Dich loro-1-oxv-pvrid i ne-4-carbonvl) am inolphenvlT-2-(2- methanesulfinvl-4, 4-dimethvl-3-oxo-cvclobut-1-enylamino) propanoic acid The compound of Example 171 (300mg, 0.54mmol) was hydrolyse in a similar manner to the method of Example 2, to give the title compound as a white powder (239mg, 0.45mmol, 83%) as an approx. 1: 1 diasteromeric mixture. 8H (DMSO d6,390K) 9.75 (1 H, br s), 8.77 (2H, s), 7.56 (2H, d, J 8.5Hz), 7.25 (2H, d, J 8.5Hz), 4.99 (1H, m), 3.18-2.98 (2H, m), 2.85 (3H, s), 1.18 (3H, s), 1.06 (3H, s). m/z (ES+, 70V) 525.9 and 527.9 (MH+).

EXAMPLE 173 (2s)-2-92-(MethVlsulfanvl)-3-oxospirof3. 5lnon-1-en-1-vllamino-3-r4- ([2,7]naphthyridin-1-ylamino)phenyl] propanoic acid The ethyl ester of the title compound was prepared in two steps from the free amine of Intermediate 12 (1.40g, 0. 41mmol), spiro [3.5] nonane-1,3- dione (650mg, 0.42mmol) [prepared according to the method of Wasserman, H. H. et al, J. Org. Chem., 38,1451-1455 (1973)] and a 1.0M solution of methyl sulfenyl chloride in DCM (0. 5ml, 0.5mmol) according to the method of Example 108 (1.53g, 0.30mmol, 71%). This ester was then subjected to hydrolysis according to the method of Example 2 to give the title compound as a yellow powder (1.15g, 0.23mmol, 57%). 6H (DMSO d6, 390K) 9.80 (1H, s), 8.61 (1H, d, J 5.6Hz), 8.13 (1H, d, J 5.4Hz), 7.67 (2H, d, J 8. 3Hz), 7.60 (1 H, d, J 5. 5Hz), 7.18 (1 H, d, J 8. 3Hz), 7.05 (1 H, d, J 5.5Hz), 4.37 (1H, m), 3.22-3.12 (2H, m), 2.14 (3H, s), 1.85-1.10 (10H, m). m/z (ES+, 70V) 489.1 (MH+).

EXAMPLE 174 <BR> <BR> <BR> <BR> Ethyl- (2S)-2-f 2- (methvlsulfanvl)-3-oxo-7-oxaspiror3. 51non-1-en-1-<BR> <BR> <BR> <BR> <BR> <BR> vllamino-3-4- (f2, 71naphthyridin-1-vlamino) phenvilpropanoate Was prepared in two steps from the free amine of Intermediate 12 (1.40g, 0.41 mmol), 7-oxaspiro [3.5] nonane-1,3-dione (650mg, 0.42mmol) [prepared according to the method of Wasserman, H. H. et al, J. Org.

Chem., 38,1451-1455 (1973)] and a 1.0M solution of methyl sulfenyl chloride in DCM (0. 5ml, 0.5mmol) according to the method of Example 108 to give the title compound as a yellow powder (1.21g, 0.23mmol, 55%). 8H (DMSO d6,390K) 9.82 (1H, s), 9.55 (1H, s), 8.93 (1H, d, J 9.2Hz), 8.65 (1H, d, J 5.6Hz), 8.15 (1H, d, J 5. 7Hz), 7.78 (2H, d, J 8. 5Hz), 7.68 (1H, d, J 5.6Hz), 7.23 (2H, d, J 8.5Hz), 7.13 (1H, d, J 5.7Hz), 5.16- 5.10 (1H, m), 4.20 (2H, q, J 7.1Hz), 3.77 (2H, m), 3.59-3.52 (2H, m), 3.21 (1H, dd, J 4.5Hz 13.8Hz), 2.98 (1H, dd, J 10.2Hz 13.8Hz), 1.96 (3H, s), 1.48-1.32 (4H, m), 1.23 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 519.1 (MH+).

EXAMPLE 175 <BR> <BR> <BR> <BR> (2S)-2-r2- (Methylsulfanyl)-3-oxo-7-oxaspiror3. 51non-1-en-1-vllamino- 3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid Hydrolysis of the compound of Example 174 (650mg, 0.12mmol) with lithium hydroxide (30mg, 0.7mmol), according to the method of Example 2, gave the title compound as a pale yellow powder (501mg, 0.10mmol, 85%). AH (DMSO d6,390K) 9.83 (1H, s), 9.54 (1H, s), 8.70 (1H, d, J 8.9Hz), 8.65 (1H, d, J 5.6Hz), 8.14 (1H, d, J 5.7Hz), 7.75 (2H, d, J 8.5Hz), 7.68 (1H, d, J 5.6Hz), 7.21 (2H, d, J 8.5Hz), 7.11 (1H, d, J 5.7Hz), 4.92 (1 H, m), 3.76-3.73 (2H, m), 3.62-3.54 (2H, m), 3.23 (1 H, d, J 3.9Hz 13.6Hz), 2.94 (1H, dd, J 9.9Hz, 13.6Hz), 1.91 (3H, s), 1.47-1.28 (4H, m). m/z (ES+, 70V) 491.1 (MH+).

EXAMPLE 176 <BR> <BR> <BR> <BR> Methvl- (2S)-2-f (2-bromo-4, 4-dimethvl-3-oxo-1-cvclobutenvl) aminol-3-<BR> <BR> <BR> <BR> <BR> <BR> [4-(r2, 71naphthvridin-1-yloxv) phenvllpropanoate A stirred solution containing Intermediate 13 (300mg, 0.72mmol) in THF (10ml) at rt was treated dropwise with a 1.0M solution of bromine in THF (1. 0ml, 1mmol). After 2h the reaction was diluted with EtOAc (50ml), washed with saturated aqueous sodium hydrogencarbonate solution (2x25ml), dried (MgS04) and concentrated in vacuo. Chromatography (Si02, EtOAc) gave the title compound as a white powder (217mg, 0.43mmol, 61 %). 8H (DMSO d6,360K) 9.71 (1 H, s), 8.71 (1 H, d, J 5.7Hz), 8.04 (1H, d, J 5.8Hz), 7.56 (1H, d, J 5.7Hz), 7.23-7.13 (5H, m), 6.19 (1H, d, J 8.1 Hz), 5.06-5.02 (1H, m), 3.79 (3H, s), 3.26 (2H, m), 1.19 (6H, s). m/z (ES+, 70V) 497.9 (MH+).

EXAMPLE 177 (2S)-2-r (2-Bromo-4, 4-dimethyl-3-oxo-1-cyclobutenvl) aminol-3-r4- (r2, 71naphthvridin-1-vloxy) phenyllpropanoic acid

Hydrolysis of the compound of Example 176 (80mg, 0.016mmol) with LiOH (10mg, 0.023mol) according to the method of Example 2 gave the title compound as a white powder (51 mg, 0.01 mmol, 63%). 8H (DMSO d6, 360K) 9.71 (1H, s), 8.81 (1H, d, J 5. 5Hz), 8.14 (1 H, d, J 5. 4Hz), 7.87 (1 H, d, J 5.2Hz), 7.52 (1H, d, J 5.4Hz), 7.38 (2H, d, J 8.5Hz), 7.28 (2H, d, J 8.5Hz), 4.87-4.84 (1H, m), 3.31-3.15 (2H, m), 1.18 (3H, s), 1.10 (3H, s). m/z (ES+, 70V) 483.9 (MH+).

EXAMPLE 178 <BR> <BR> <BR> <BR> N4-(4-r3-(2-Bromo-3-oxospiror3. 51non-1-en-1-v1)-5-oxo-1, 3-oxazolan-4-<BR> <BR> <BR> <BR> <BR> <BR> <BR> vilmethvlphenyl)-3, 5-dichloroisonicotinamide A solution containing the compound of Example 32 (1. 0g, 1.76mmol), finely ground potassium carbonate (500mg) and DMAP (50mg, 0.4mmol), in DMF (14ml) was treated dropwise with chloromethyl pivalate (0. 5ml) at room temperature. After 24h the reaction was diluted with EtOAc (150ml), washed with brine (3x50ml), dried (MgS04) and concentrated in vacuo.

Chromatography (Si02, 1: 1 EtOAc: hexanes) gave the title compound as a white powder (475mg, 0.82mmol, 47%). 8H (DMSO d6,390K) 10.97 (1H, s), 8.80 (2H, s), 7.63 (2H, d, J 8.5Hz), 7.17 (2H, d, J 8.5Hz), 5.41 (1H, d, J 3.9Hz), 4.95 (1H, m), 4.69 (1H, d, J 3.9Hz), 3.39-3.29 (2H, m), 1.99-1.06 (10H, m). m/z (ES+, 70V) 580.9 (MH+).

EXAMPLE 179 <BR> <BR> <BR> <BR> 3-f 2- (Isopropvlsulfanyl)-3-oxospirof3. 51non-1-en-1-yll-4-r4-<BR> <BR> <BR> <BR> <BR> <BR> <BR> (r2. 71naphthyridin-1-ylamino) benzyll-1, 3-oxazolan-5-one Prepared from the compound of Example 121 (450mg, 0.88mmol) in a similar manner to the compound of Example 178 to give the title compound as an off-white powder (390mg, 0.73mmol, 84%). 8H (DMSO d6,390K) 9.57 (1H, s), 8.64 (1H, d, J 5.7Hz), 8.24 (1H, d, J 5.8Hz), 8.17 (1 H, s), 7.74 (2H, d, J 8.4Hz), 7.53 (1 H, d, J 5.6Hz), 7.16 (2H, d, J 8.4Hz), 7.06 (1 H, d, J 5.8Hz), 5.20 (1 H, br s), 4.93 (1 H, br s), 4.26 (1 H, br s), 3.58

(1H, br s), 3.33 (1H, br s), 3.27 (1H, m), 1.99-1.06 16H, m). m/z (ES+, 70V) 529.2 (MH+).

EXAMPLE 180 Neopentyl (2S)-2-r (2-bromo-3-oxospirof3. 51non-1-en-1-yl) aminol-3-f4- r (3, 5-dichloroisonicotinoyl)amino]phenyl}propanoate Using a similar procedure to that for the preparation the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol), EDC (191mg, 1.0mmol), HOBT (120mg, 0.89mmol), neopentyl alcohol (0.4g, 4.5mmol) and DMF (15ml) was prepared, after purification by chromatography (Si02, EtOAc), the title compound as a white powder (400mg, 0.63mmol, 71%). #H (DMSO d6,390K) 10.87 (1H, s), 8.92 (1H, d, J 9.1 Hz), 8.79 (2H, s), 7.58 (2H, d, J 8.5Hz), 7.32 (2H, d, J 8.5Hz), 4.88-4.82 (1H, m), 3.86 (1H, d, J 10.4Hz), 3.80 (1H, d, J 10.4Hz), 3.26 (1H, dd, J 13.9,4.8Hz), 3.03 (1H, dd, J 13.9,10. 1Hz), 1.99-1.06 (10H, m), 0.91 (9H, br s). m/z (ES+, 70V) 638.0 (MH+).

EXAMPLE 181 Isopropvl (2S) 3-f4-r (3, 5-dichloroisonicotinovl) aminolphenvll-2- (2- methvl-3-oxo-7-oxa-spirof3. 5]non-1-en-1-ylamino) propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 164 to give the title compound in 79% yield. 8H (DMSO d 6) 10.87 (1H, s), 8.80 (2H, s), 8.10 (1H, d, J 8.9Hz), 7.59 (d, 2H, J 8.2Hz), 7.31 (d, 2H, J 8.2Hz), 4.98 (1H, m), 4.30 (1H, m), 3.76 (2H, m), 3.60 (2H, m), 3.11 (1H, dd, J 13.7,5.3Hz), 3.00 (1H, dd, J 13.2,9.1 Hz), 2.00-1.80 (2H, m), 1.42 (3H, s), 1.17 (6H, m). m/z (ES+, 70V) 546.1 (MH+).

EXAMPLE 182 5-Methvl-2-oxo-f1, 31dioxol-4-vimethyl (2S) 2- (2-bromo-3-oxo- spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3, 5- dichloroisonicotinovl) aminolphenvl} propanoate To a stirred solution of the compound of Example 32 (1. Og, 1.76 mmol) and potassium carbonate (484mg, 3.52mmol) in DMF (20ml) at 0°C was added Intermediate 73 (408mg, 2.12mmol) in one portion. The ice-bath was removed and the mixture allowed to stir at room temperature for 3 hours. The mixture was poured into ice/water and extracted with EtOAc.

The extract was washed three times with brine, dried (MgSO4) and the solvent removed in vacuo to afford a yellow solid. Chromatography (Si02, 1: 1 hexane: EtOAc) gave the title compound as a white solid (686mg, 57%). 8H (DMSO d6) 10.90 (1H, s), 8.95 (1H, d, J 8.9Hz), 8.80 (2H, s), 7.60 (2H, d, J 8.3Hz), 7.26 (2H, d, J 8.3Hz), 4.86 (1H, m), 3.22 (1H, m, J 4.0,13.6Hz), 3.06 (1H, m, J 13.2,10.7Hz), 2.17 (3H, s), 1.74-1.38 (10H, m). m/z (ES+, 70V) 680.0 (MH+).

EXAMPLE 183 2, 3-Dihvdroxy-propvl (2S) 2-(2-bromo-3-oxo-spiror3. 51non-1-en-1- vlamino)-3-f4-f (3, 5-dichloroisonicotinovl) aminolphenvl} propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 32 and glycerol to give the title compound in 48% yield after chromatography on silica gel. #H (DMSO d6) 10.91 (1 H, s), 8.91 (1 H, d, J 9.2Hz), 8.80 (2H, s), 7.60 (2H, d, J 8.5Hz), 7.28 (2H, d, J 8.3Hz), 5.01 (1H, m), 4.85 (1H, m), 4.71 (1H, m), 4.20 (1H, m), 4.09 (1H, m), 3.71 (1H, m), 3.57 (1H, m), 3.26 (1H, dd, J 13.8,3.9Hz), 3.04 (1H, dd, J 13.8, 9.3Hz), 1.80-1.45 (10H, m). m/z (ES+, 70V) 640.0 (MH+).

EXAMPLE 184 <BR> <BR> <BR> <BR> Tetrahvdro-furan-3-vimethvl (2S)-2- (2-bromo-3-oxo-spiror3. 51non-1-<BR> <BR> <BR> <BR> <BR> <BR> en-1-vlamino)-3-f4-f (3, 5-dichloroisonicotinovl) aminolphenyl} propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 32 and tetrahydrofurfuryl alcohol to give the title compound in 52% yield after chromatography on silica gel. 6H (DMSO d6) 10.88 (1H, s), 8.93 (1H, d, J 9.1 Hz), 8.80 (2H, s), 7.60 (2H, d, J 8.3Hz), 7.28 (2H, d, J 6.9Hz), 4.84 (1H, m), 4.15 (2H, m), 4.05 (1H, m), 3.23 (1H, dd, J 13.8,4.4Hz), 3.04 (1H, dd, J 13.6,9.6, Hz), 2.00-1.50 (14H, m). m/z (ES+, 70V) 650.1 (MH+).

EXAMPLE 185 Tetrahydropyran-4-yl (2S)-2- (2-bromo-3-oxo-spirof3. 51non-1-en-1- vlami no)-3-f4-r (3, 5-dichloroisonicotinoyl)amino]-phenyl} propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 32 (0.5g, 0.89mmol), EDC (300mg), HOBT (200mg) and 4-hydroxytetrahydropyran (0. 8ml) in DMF (5ml) to give the title compound (0.42g, 74%). 8H (300MHz, DMSO d6) 11.02 (1 H, br), 9.04 (1 H, d, J 9. 0Hz), 8.92 (2H, s), 7.73 (2H, d, J 8.4Hz), 7.42 (2H, d, J 8.5Hz), 5.13 (1H, br), 4.93 (1H, br), 3.87 (2H, br), 3.60 (2H, br), 3.36 (1H, dd, J 14.0,5. 1Hz), 3.18 (1H, dd, J 13.9,9.3Hz), 1.61-2.06 (12H, m), 1.52 (2H, d, J 12.6Hz), 1.26 (2H, br). m/z (ES+, 70V) 652 (MH+).

Example 186 <BR> <BR> <BR> <BR> Isopropvl (2S)-2- (2-bromo-3-oxo-7-oxa-spiror3. 51non-1-en-1-vlamino)- 3- {4-r (3, 5-dichloroisonicotinoyl)amino]phenyl} propanoate To a solution of the isopropyl ester of the compound of Example 40 (0.4g, 8.1 mmol) [prepared in a similar manner to the compound of Example 138] in THF (5ml) at room temperature was added NBS (0.3g). The mixture was stirred for 2h and then partitioned between water (100ml) and EtOAc

(100ml), the organics were separated and washed with water (3x50ml), brine (50ml), dried (Na2SO4), filtered and concentrated in vacuo to give a crude oil. Purification by column chromatography (3: 2, hexane: EtOAc) gave the title compound as a white solid (0.24g, 52%). 8H (400MHz, DMSO d 6) 9.02 (1H, d, J 9.0Hz), 8.79 (2H, s), 7.59 (2H, d, J 8.5Hz), 7.27 (2H, d, J 8.5Hz), 4.97 (1H, m), 4.75 (1 H, m), 3.80 (2H, m), 3.58 (2H, q, J 11. 7Hz), 3.20 (1H, dd, J 13.0,5. 0Hz), 3.03 (1H, dd, J 13.0,9.4, Hz), 1.97 (2H, m), 1.49 (1H, dd, J 13.0,1.6Hz), 1.33 (1H, dd, J 13.2,1.6Hz), 1.23 (3H, d, J 11.3Hz), 1.19 (3H, d, J 11.4Hz). m/z (ES+, 70V) MH+612.

EXAMPLE 187 Ethvl (2S)-3-{5-[(3,5-dichloroisonicotinoyl)amino]pyridin-2-yl}-2- (4,4- dimethvl-2-methvlsulfanvl-3-oxo-cvclobut-1-enylamino) propanoate A mixture of Intermediate 43 (0.44g, 1.15mmol) and 3-hydroxy-4,4- dimethyl-2-cyclobutenone (0.14g, 1.1eq) was stirred at room temperature for a period of 17h. The mixture was concentrated in vacuo and triturated with diethyl ether and the resulting solid re-dissolved in THF (10ml). The solution was treated with a solution of methanesulfenyl chloride at 0-5°C in DCM until TLC analysis of the mixture indicated complete consumption of starting material. The mixture was partitioned between EtOAc (50ml) and water (50ml), the organics were separated and and washed with water (2x50ml), brine (50ml), dried MgS04), filtered and concentrated to give a crude white foam. Purification by column chromatography (EtOAc: hexane, 1: 1) gave the title compound as a white solid (0.55g, 91%. #H (400MHz, DMSO d 6) 11.16 (1H, br), 8.87 (1H, d, J 9.0Hz), 8.82 (s, 2H), 8.72 (1 H, d, J 2.5Hz), 8.05 (1 H, dd, J 8.4,2.5Hz), 27. 35 (1 H, d, J 8.4Hz), 5.33 (1H, m), 4.18 (2H, q, J 7.1Hz), 3.36 (1H, dd, J 14.1,5. 0Hz), 3.32 (3H, s), 3.20 (1H, dd, J 14.1,9.4Hz), 0.94 (3H, s), 1.09 (3H, s), 1.21 (3H, t, J 7. 1Hz),. m/z (ES+, 70V) MH+523.

EXAMPLE 188

isopropyl (2S)-3-{5-[(3,5-Dichloroisonicotinoyl)amino]pyridin-2-yl}-2- (4, 4-dimethvl-2-methvlsulfanvl-3-oxo-cvclobut-1-envlamino) propanoate Hydrolysis of the compound of Example 187 (0.35g, 0.67mmol) according to the method of Example 2 and re-esterified with isopropanol (EDC, HOBT, DMF) gave the title compound as a white solid (65mg, 18%). 8H (400MHz, DMSO d6) 0 11. 16 (1H, br), 8.85 (1H, d, J 8. 9Hz), 8.82 (2H, s), 8.72 (1H, d, J 1.8Hz), 8.04 (1H, m), 7.35 (1H, d, J 8.3Hz), 5.28 (1H, m), 5.00 (1H, m), 3.35 (1H, dd, J 14.1,5. 0Hz), 3.32 (3H, s), 3.18 (1H, dd, J 14.1,9.3Hz), 1.22 (6H, m), 1.09 (3H, d, J 1.2Hz), 0.95 (3H, d, J 1.2Hz). m/z (ES+, 70V) MH+ 537.

EXAMPLE 190 Ethyl (2S)-3-{4-[(3,5-dichloro-1-oxy-pyridine-4- carbonyl) aminolphenvl}-2- (3-oxo-spirof3. 51non-1-en-1-vlamino) propanoate Intermediate 75 (170mg, 0.42 mmol) and 1-keto-3-hydroxy [3,5]-non-2-ene (200mg, 1. 3mmol) were stirred together at room temperature overnight in THF (5ml) The reaction mixture was diluted with DCM (50ml), washed with sodium bicarbonate solution (saturated, 2x50ml), dried (MgSO4) and reduced in vacuo to give a yellow solid. The residue was chromatographed (Si02 DCM: methanol, 98: 2) to give the title compound as a white powder (120mg). 8H (CDC13) 9.03 (1 H, br s), 8.11 (2H, s), 7.64 (2H, d, J 7.9Hz) 7.18 (2H, d, J 7.5Hz), 5.01 (1H, m), 4.22 (1H, m), 4.21 (2H, q, J 7.1 Hz), 3.12 (2H, m), 1.45 (10H, m), 1.30 (3H, t, J 7. 1Hz). m/z (ES+, 70V) 532.0 (MH+).

Example 191 (2S)-3-{4-[(3,5-Dichloro-1-oxy-pyridine-4-carbonyl)am,ino]ph enyl}-2-(3- oxo-spiror3. 51non-1-en-1-vlamino) propanoic acid

The compound of Example 190 (30mg, 0.056mol) was hydrolyse by the method of Example 2 to afford the title compound as white powder (20mg). 8H (CD30D) 8.46 (2H, s), 7.47 (2H, d, J 8.5Hz), 7.18 (2H, d, J 8.5Hz), 4.14 (1H, m), 3.21 (1H, m), (obscured by MeOH/water) 2.83 (1H, dd, J 9. 6,4.2Hz), 1.80-1.10 (9H, m), 1.07 (3H, t, J 7.1Hz). m/z (ES+, 70V) 505.0 (MH+).

EXAMPLE 192 Ethvl (2S)-2- (2-bromo-3-oxo-spiror3. 51non-1-en-1-vlamino)-3-f4-f (3, 5- dichloro-1-oxy-pvridine-4-carbonvl) aminolphenyl} propanoate Prepared from the compound of Example 190 (85mg, 0.160 mmol) in a similar manner to the compound of Example 31 to give the title compound (80mg). 8H (CDC13) 8.94 (1H, br s), 8.14 (2H, s), 7.62 (2H, d, J 8.4Hz), 7.13 (2H, d, J 8.3Hz), 5.88 (1H, m), 5.00 (1H, m), 4.26 (2H, q, J 7.1 Hz), 3.26 (2H, m), 2.03-1.41 (10H, m), 1.35 (3H, t, J 7. 1Hz). m/z (ES+, 70V) 612.0 (MH+).

EXAMPLE 193 (2S)-2-(2-Bromo-3-oxo-snirof3. 51non-1-en-1-vlamino)-3-f4-f (3, 5- dichloro-1-oxv-pvridine-4-carbonvl) aminolphenvl} propanoic acid The compound of Example 192 was hydrolyse by the method of Example 2 to afford the title compound. 8H (DMSO d6) 10.80 (1H, s) 8.73 (2H, s), 7.55 (2H, d, J 8. 0Hz), 7.24 (2H, d, J 8.4Hz), 4.65 (1H, m), 3.22 (1 H, dd, J 13.8,4.4Hz,), 3.00 (1 H, dd, J 13.7,4.4Hz), 1.82-1.00 (11 H, m).

EXAMPLE 194 Ethyl (2S)-2- (2-chloro-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-{4-[(3,5- dichloro-1-oxv-pvridine-4-carbonvl) aminolphenvl} propanoate Prepared in a similar manner to the compound of Example 61 from the compound of Example 190 (500mg, 0.94 mmol) and N-chlorosuccinimide (150mg, 1. 13mmol) to give the title compound as a white powder (220mg).

8H 10.85 (1H, s), 8.84 (1H, d, J 9.0Hz), 8.75 (2H, s), 7.58 (2H, d, J 8.5Hz) 7.27 (2H, d, J 8.5Hz), 4.68 (1 H, m) 4.20 (2H, q, J 7.0Hz) 3.22 (1 H, dd, J 13.8,4.7Hz) 3.01 (1H, dd, J 13.7,9.7Hz) 1.74-1.55 (9H, m) 1.38 (1H, m) 1.23 (3H, m, J 7. 1 Hz) 1.13 (1H, m). m/z (ES+, 70V) 568.0 (MH+).

EXAMPLE 195 (2S)-2-(2-Chloro-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3{4-[(3 ,4- dichloro-1-oxv-pvridine-4-carbonvl) aminolphenyllpropanoic acid The compound of Example 194 was hydrolyse by the method of Example 2 to afford the title compound. 8H (DMSO d6) 10.83 (1 H, s), 8.75 (m, 3H), 7.57 (2H, d, J 8.4Hz) 7.26 (2H, d, J 8.5Hz), 4.63 (1H, m) 3.22 (1H, dd, J 13.8,4.5Hz) 3.00 (1 H, m), 1.64-1.55 (9H, m) 1.35 (1H, m), 1.15 (1 H, m). m/z (ES+, 70V) 538.0 (MH+).

EXAMPLE 196 Ethyl (2S)-2-r (2-chloro-4, 4-dimethyl-3-oxo-1-cvclobutenvl) aminol-3-f4- r(3,5-dichloroisonicotinovl) aminolphenylTpropanoate Prepared in a similar manner to the compound of Example 61 from the compound of Example 5 (3.2mmol) and N-chlorosuccinimide (3.5mmol) to give the title compound as a white powder (0.9mmol, 31%). 8H (DMSO d, 300K) 9.05 (1 H, d, J 9.0Hz), 8.79 (2H, s) 7.60 (2H, d, J 8.5Hz) 7.25 (2H, d, J 8.5Hz) 4.70 (1H, m) 4.19 (2H, q, J 7.1Hz 3.22 (1H, dd, J 13.9,5. 0Hz) 3.02 (1H, dd, J 13.9,9.2Hz) 1.21 (3H, q, J 7.1Hz) 1.23 (3H, s) 1.04 (3H, s). m/z (ES+, 70V) 512.0 (MH+).

EXAMPLE 197 1-Methyl-3-pyrrolidinyl (2S)-2-[(2-bromo-4,4-dimethyl-3-oxo- 1-cvclobutenvl) aminol-3-f4-f (3,5-dichloroisonicotinoyl) aminolphenvl} propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 34 (0.65 mmol), EDC (0.72mmol), HOBT

(0.72mmol) and 1-methyl-3-pyrrolidinol (1.95mmol) in DMF (5ml) to give the title compound (0.25mmol, 40%) 8H (CD30D) 8.55 (2H, s), 7.52 (2H, d, J 8.5Hz), 7.20 (2H, d, J 8.5 Hz), 4.92, (1 H, m), 3.38 (1 H, dd, obscured by MeOH) 2.96 (1H, dd, J 13.9,9.2Hz) 2.50-2.18 (4H, m) 2.18 (3H, s) 1.89-1.56 (m, 4H), 1.12 (3H, s), 1.00 (3H, s). m/z (ES+, 70V) 625.0 (MH+).

EXAMPLE 198 <BR> <BR> <BR> <BR> Isopropyl (2S)-2- (2-bromo-4, 4-dimethyl-3-oxo-cvclobut-1-enylamino)- 3-{4-[(3,5-dichloroisonicotinoyl)amino]phenyl} propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 34 (0.65 mmol), EDC (0.84mmol), HOBT (0.84mmol) and isopropanol (2.28mmol) in DMF (5ml) to give the title compound (0.25mmol, 34%). 8H (DMSO d6) 10.88 (1H, s) 9.69 (1H, d, J 9.0Hz) 8.79 (2H, s) 7.59 (2H, J 8.5 Hz) 7.28 (2H, d, J 8.5Hz), 4.97 (1 H, m) 4.75 (1H, m) 3.20 (1H, dd, J 13.9,5.1 Hz) 3.03 (1H, dd, J 14.0,9.2Hz) 1.24 (m, 6H) 1.14 (3H, s) 1.05 (3H, s). m/z (ES+, 70V) 570.0 (MH+).

EXAMPLE 199 Ethyl (2S)-3-4- (2, 6-Dichlorobenzoylamino) phenyll-2- (3-oxo- spirof3. 51non-1-en-1-vlamino) propanoate The title compound was prepared in a similar manner to that of the compound of Example 27 (coupling of amino acid ethyl ester (1.68mmol), dione (1.68mmol) in DCM (5ml)) to give the title compound as a yellow powder (1.1 mmol, 66%). 8H (CD30D) 7.83 (2H, d, J 8.3Hz), 7.55-7.35 (4H, m), 7.47 (2H, d, J 8.4Hz), 4.62 (1H, s), 4.50 (3H, m), 3.50 (1H, m), 3.08 (1H, m) 2.05-1.55 (11H, m) 1.49 (3H, t, J 7. 1Hz). m/z (ES+_, 70V) 501.0 (MH+).

EXAMPLE 200 <BR> <BR> <BR> Ethyl (2S)-2- (2-bromo-3-oxo-spirof3. 51non-1-en-1-vlamino)-3-f4- (2, 6-<BR> <BR> <BR> <BR> dichlorobenzovlamino) phenvil propanoate

Prepared in a similar manner to the compound of Example 72 from the compound of Example 199 (1.08mmol) to give the title compound as yellow powder (0.86mmol, 80%). #H (CD30D) 7.53 (2H, d, J 8.4Hz), 7.38- 7.15 (4H, m), 7.17 (2H, d, J 8.4Hz), 5.32 (1H, m) 4.65 (1H, m), 3.22 (1H, dd, J 13.9,4.4Hz), 3.18 (q, 2H, J 7.1Hz) 2.95 (1H, dd J 13.9,9.5Hz,), 1.85- 1.20 (14H, m).). m/z (ES+, 70V) 581.0 (MH+).

EXAMPLE 201 (2S)-2-(2-Bromo-3-oxo-sniror3. 51non-1-en-1-ylam ino)-3-r4-(2, 6- dichlorobenzoylamino)-phenvll propanoic acid Prepared in a similar manner to the compound of Example 2 from the compound of Example 200 (0.85mmol) to give the title compound as white powder (0. 60mmol, 60%). 8H (DMSO d6) 13.39 (1 H, br s), 10.70 (1 H, d, J 6.1 Hz), 8.81 (1H, d, J 9.2Hz), 7.61 (3H, m), 7.56 (1H, m), 7.23 (2H, d, J 8.2Hz), 3.18 (1H, dd, J 13.9,4.4Hz), 2.98 (1H, ddJ 13.8,9.6Hz), 2.89-1.20 (11 H, m). m/z (ES+, 70V) 567.0 (MH+).

EXAMPLE 202 isopropyl (2S)-2- (2-bromo-3-oxo-spirof3. 51non-1-en-1-ylamino)-3-f4- (2, 6-dichlorobenzovlarnino) phenvil propanoate Prepared in a similar manner to the compound of Example 138 from the compound of Example 201 (0.78 mmol) to give the title compound (0.49mmol, 63%). 8H (DMSO d 6) 10.71 (1 H, s), 8.89 (1 H, d, J 9. 0Hz), 7.62- 7.47 (5H, cm), 4.97, (1 H, m), 3.17 (1 H, dd, J 4.8Hz, 13.8Hz), 3.00 (1 H, dd J 9.7Hz, 13.8Hz), 1.79-1.50 (8H, c m) 1.35 (1H, m) 1.24-1.11 (7H, m). m/z (ES+, 70V) 609.0 (MH+).

EXAMPLE 203 Ethvl (2S)-3-[4-(3-methyl-[2,7]naphthyridin-1-ylamino)phenyl]-2-(3 - oxo-spirof3. 51non-1-en-1-ylamino) propanoate

Prepared in a similar manner to that of the compound of Example 3 to give the title compound as a yellow powder (1. 5mmol, 76%). 8H (CD03) 9.56 (1H, s), 8.53 (1H, d, J 5.8Hz), 7.78 (2H, d, J 8.4Hz), 7.45 (1H, d, J 5.8Hz), 7.08 (2H, d, J 8.5Hz), 6.89 (1 H, s), 5.77 (1 H, m), 4.57 (1 H, s), 4.27 (2H, q, J 7.1Hz), 3.10 (2H, m), 2.54 (3H, s), 1.84-1.23 (14H, m). m/z (ES+, 70V) 485.2 (MH+).

EXAMPLE 204 Ethyl (2S)-2-(2-bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-[4-(3- methvl-f2, 71naphthvridin-1-ylamino) phenyil propanoate Prepared in a similar manner to the compound of Example 31 from the compound of Example 203 (0.62mmol), bromine (0. 81mmol) and triethylamine (0. 81mmol) in DCM (5ml)) to give the title compound as yellow powder (0.25mmol, 40%). #H (CD30D) 9.44 (1H, s), 8.34 (1H, d, J 5.8Hz), 7.43 (1H, d, J 5.8Hz), 7.09 (2H, d, J 8.5 Hz), 6.81 (1H, s), 4.87 (1H, m), 4.89 (1H, m), 4.13 (2H, q, J 7.1 Hz), 3.22 (1H, m), (obscured mostly by MeOH), 2.92 (1H, dd, J 14.0,9.7Hz), 2.34 (3H, s), 1.58-1.26 (10H, m), 1.18 (3H, t, J 7.1Hz). m/z (ES+, 70V) 564.2 (MH+).

EXAMPLE 205 Ethyl (2S)-2-(2-bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-[4-(3- methvl-f2, 71naphthvridin-1-ylamino) phenvll propanoate Prepared in a similar manner to to the compound of Example 2 from the compound of Example 204 (0.22mmol) to give the title compound as yellow powder (0.20mmol, 90%). 8H (DMSO d6) 9.76 (1 H, s), 9.70 (1 H, s), 8.87 (1H, s, J 9.5Hz), 8.56 (1H, d, J 5.6Hz), 7.87 (2H, d, J 8.4Hz), 7.56 (1H, d, J 5.6Hz), 7.20 (2H, d, J 8.4Hz), 6.96 (1H, s), 4.73 (1H, m), 3.22 (1H, dd, J 13.9,4. 0Hz), 2.93 (1H, dd J 13.5,10.1 Hz,), 2.42 (3H, s), 1.80- 1.00 (11 H, m). m/z (ES+, 70V) 535.0 (MH+).

EXAMPLE 206

(2S)-3-r4- (3-Methvl- [2, 71naphthyridin-1-vlamino) phenvil-2- (3-oxo- spirof3. 51non-1-en-1-vlamino) propanoic acid Prepared in a similar manner to the compound of Example 2 from the compound of Example 203 (0.62mmol) to give the title compound as white powder (0.27mmol, 43%). #H (DMSO d6) 9.81 (1H, s), 9.52 (1H, s), 8.58 (1H, d, J 5. 6Hz), 8.30 (1 H, J 8.6Hz), 7.86 (2H, d, J 8.4Hz), 7.57 (1 H, d, J 5.6Hz), 7.22 (2H, d, J 8.5Hz), 6.97 (1 H, s), 4.08 (1H, m), 4.32 (1H, s), 3.15 (1H, dd, J 13.7,4.7Hz), 2.97 (1H, dd, J 13.7,9.5Hz), 2.44 (3H, s), 1.74- 1.45 (9H, m), 1.24-1.15 (2H, m). m/z (ES+, 70V) 457.1 (MH+).

EXAMPLE 207 Ethyl (S)-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]-2-(3-oxo- spirof3. 51non-1-en-1-ylamino) propanoate Prepared in a similar manner to the compound of Example 3 to give the title compound as a yellow powder (1.4 mmol, 73%) 8H (CDC13) 9.61 (1 H, s), 8.65 (1 H, d, J 5.7Hz), 8.25 (1 H, d, J 5.8Hz), 7.71 (2H, d, J 8.4Hz), 7.63 (1H, d, J 8.5Hz), 7.12 (2H, d, J 8.5Hz), 7.05 (1H, d, J 5.8Hz), 5.80 (1H, m), 4.55 (1 H, s), 4.29 (2H, q, J 7. 2Hz), 3.13 (2H, m), 1.87-1.25 (14H, m). m/z (ES+, 70V) 471. 1 (MH+).

EXAMPLE 208 Ethyl (2S)-2- (2-bromo-3-oxo-spiror3. 51non-1-en-1-vlamino)-3-f4- ([2,7]naphthyridin-1-ylamino)-phenyl] propanoate Prepared in a similar manner to that of Example 31 from the compound of Example 207 (0.64mmol) to give the title compound as a yellow powder (0. 45mmol, 76%). 8H (CDCl3) 9.81 (1H, s), 8.64 (1H, d, J 5.7Hz), 8.29 (1H, d, J 5.8Hz), 7.75 (2H, d, J 8. 3Hz), 7.60 (1H, d, J 5.8Hz), 7.12 (2H, d, J 8.4Hz), 7.08 (1H, d, J 5.7Hz), 5.91 (1H, m), 5.03 (1H, m), 4.28 (2H, q, J 7.1 Hz), 3.29 (2H, m), 1.81-1.39 (10H, m), 1.35 (3H, t, J 7.1 Hz). m/z (ES+, 70V) 550.0 (MH+).

EXAMPLE 209 (S)-2- (2-Bromo-3-oxo-spirof3. 51non-1-en-1-ylam i no)-3-r4- (f2, 71naphthyridin-1-vlamino)-phenyil-propionic acid Prepared in a similar manner to the compound of Example 2 from the compound of Example 208 (0.40mmol) to give the title compound as white powder (0.25mmol, 64%) 8H (DMSO d6, 300 K) 9.90 (1 H, s), 9.56 (1 H, s), 8.86 (1H, d, J 9.3Hz), 8.66 (1H, d, J 5.6Hz), 8.17 (1H, d, J 5.7Hz), 7.81 (2H, d, J 8. 2Hz), 7.70 (1 H, d, J 5.6Hz), 7.24 (2H, d, J 8. 4Hz), 7.14 (1 H, d, J 5.7Hz), 4.78 (1H, m) 3.23 (1H, dd, J 13.9,4.1 Hz), 2.99 (1H, dd, J 13.7, 10.0Hz), 1.81-1.04 (11 H, m). m/z (ES+, 70V) 522.0 (MH+).

EXAMPLE 210 (2S)-3-[4-(2,7]Naphthyridin-1-ylamino)phenyl]-2-(3-oxo-spiro ]3, 51non- 1-en-1-vlamino) propanoic acid Prepared in a similar manner to the compound of Example 2 from the compound of Example 207 (0.64mmol) to give the title compound as white powder (0. 21mmol, 33%). 8H (DMSO d6, 300K) 9.85 (1 H, s), 9.54 (1 H, s), 8.67 (1H, d, J 5.6Hz), 8.28 (1H, d, J 8.6Hz), 8.18 (1H, d, J 5.6Hz), 7.78 (2H, d, J 8.3Hz), 7.70 (1 H, d, J 5.6Hz), 7.23 (2H, d, J 8.4Hz), 7.14 (1 H, d, J 5.7Hz), 4.34 (1H, s), 4.08 (1H, m), 3.15 (1H, dd, J 13.8,4.8Hz), 2.95 (1H, dd, J 13.8,9.4Hz), 1.74-1.39 (9H, m), 1.20 (2H, m). m/z (ES+, 70V) 443.1 (MH+).

EXAMPLE 211 (2S)-3-[4-([2,7]Naphthyridin-1-yloxy)phenyl]-2-(3-oxo-spiro[ 3. 51non-1- en-1-ylamino) propanoic acid Prepared in a similar manner to the compound of Example 2 (hydrolysis from the compound of Example 35 (0.70 mmol) to give the title compound as a white powder (0.56 mmol, 80%). 8H (DMSO d6, 300K) 9.70 (1H, s), 8.81 (1H, d, J 5.7Hz), 8.30 (1H, d, J 8.8Hz), 8.10 (1H, d J 5.8Hz), 7.89 (1H, d, J 5.7Hz), 7.53 (1H, d, J 5.9Hz), 7.34 (1H, d, J 8.5Hz), 7.23 (2H, d,

J 8.5Hz), 4.34 (1H, s), 4.15 (1H, m), 3.21 (1H, dd, J 14.0,4.8Hz), 3.00 (1 H, dd, J 13. 8,9.7Hz), 1.71-1.50 (11 H, m). m/z (ES+, 70V) 444.6 (MH+).

EXAMPLE 212 Ethyl (2S)-3-{4-[ (3,5-dichloroisonicotinovl) aminolphenvll-2- (2- hvdroxv-3-oxo-spirof3. 51non-1-en-1-vlamino)-propionic acid ethyl ester To a solution of the compound of Example 27 (1. 0g, 1. 9mmol) in DCM (40ml) at-40°C was added lead tetraacetate (0.94g, 1.1eq). The mixture was allowed to warm to 0°C and stirred at this temperature for 8h. The reaction mixture was partitioned between EtOAc (200ml) and water (100ml), the organics were separated washed with water (2x100m1), brine (50ml), dried (MgSO4), filtered and concentrated in vacuo to give a crude oil. The crude was dissolved in ethanol (10ml) and treated with NaH (100mg). The mixture was stirred at room temperature until TLC analysis indicated that all starting material had been consumed. The reaction was quenched by the addition of NH4CI (5ml, sat. aq.), EtOAc (2x20ml) extraction of the mixture followed by washing with water (10ml), brine (10ml), drying (MgS04), filtering and concentration in vacuo to give a crude product which was purified by column chromatography (Si02, EtOAc: Hexane 1: 1) to give the title compound as a white foam (0.89g, 86%). #H (DMSO d6, 400MHz) 10.83 (1H, br), 8.78 (2H, s), 7.51 (2H, d, J 8.5Hz), 7.12 (2H, d, J 8.5Hz), 4.94 (1H, dd, J 11.4,5. 0Hz), 4.10 (2H, m), 3.33 (1 H, dd, J 14.1,4.9Hz), 3.14 (1 H, dd, J 14.0,11.4Hz), 1.40-1.63 (4H, m), 1.19-1.33 (6H, m), 1.16 (3H, t, J 7.1Hz). m/z (ES+, 70V) 532 (MH+).

EXAMPLE 213 Ethyl (2S)-3-{4-[(3,5-Dichloroisonicotinoyl)amino]phenyl}-2-(2- methoxv-3-oxo-spirof3. 51non-1-en-1-ylamino) propanoate To a solution of the compound of Example 212 (0.8g, 1.5mmol) in acetone (15ml) was added K2CO3 (5g) and methyl iodide (2. 5ml). The mixture was stirred at room temperature for 5 days. The mixture was filtered and

concentrated in vacuo and the residue purified by column chromatography (Si02, EtOAc: Hexane 1: 1) to give the title compound as a white solid (0.45g, 55%). AH (DMSO d6, 400MHz) 8.50 (2H, d, J 4.8Hz), 7.21 (2H, d, J 8.4Hz), 7.04 (2H, d, J 8. 4Hz), 4.87 (1H, dd, J 11.8,4.9Hz), 4.00-4.16 (2H, m), 3.34 (3H, s), 3.26 (1H, dd, J 13.9,4.9Hz), 3.07 (1H, dd, J 13.9, 11.6Hz), 1.15-1.66 (10H, m), 1.12 (3H, t, J 7.0Hz). m/z (ES+, 70V) 546 (MH+) EXAMPLE 214 Ethyl (2S)-2- (2-bromo-3-oxo-spiror3. 51non-1-en-1-vlamino)-3- (2, 4, 6- trimethoxy[1, 1'-biphenyl]-4-yl) propanoate The title compound was prepared by the methods as described herein. 8H (CDC13) 7.19 (2H, d, J 8.1 Hz), 7.04 (2H, d, J 8.1 Hz), 6.14 (2H, s), 5.84 (1H, d, J 8.6Hz), 4.98 (1H, m), 4.20 (2H, q, J 7.1 Hz), 3.78 (3H, s), 3.62 (6H, s), 3.21 (2H, d), 1.97-1.40 (10H, m), 1.24 (3H, t, J &.1 Hz). m/z (ES+, 70V) 572 (MH+).

EXAMPLE 215 (2S)-2-(2-Bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-(2,4,6 - trimethoxvfl, 1'-biphenvll-4-yl) propanoic acid Prepared from the compound of Example 214 by the method of Example 2 to give the title compound. 8H (DMSO d 6) 12.30 (1 H, br s), 8.79 (2H, d, J 10.0Hz), 7.19 (2H, d, J 8. 1Hz), 7.08 (2H, d, J 8. 1Hz), 6.29 (2H, s), 4.78 (1H, m), 3.81 (3H, s), 3.61 (6H, s), 3.27 (1H, m), 2.98 (1H, dd, J 13.4, 10.2Hz), 1.95-1.00 (10H, m). m/z (ES+, 70V) 544 (MH+).

EXAMPLE 216 Tetrahvdro-furan-2-vimethyl (2S)-2- (2-Bromo-3-oxo-spiror3. 51non-1- en-1-ylamino)-3-{4-[(3,5-dichloro-pyridine-4- carbon) amino]phenyl}0propanoate

Using a similar procedure to that for the preparation of the compound of Example 138 form the compound of Example 32 (0.25g, 0.44mmol), EDC (150mg), HOBT (100mg) and tetrahydrofurfurylalcohol (0. 5ml) in DMF (2ml) was prepared the title compound (0.15g, 52%). 8H (400MHz, DMSO d6) 10.88 (1H, s), 8.93 (1H, d, J 9.1 Hz), 8.80 (2H, s), 7.60 (2H, d, J 8.3Hz), 7.28 (2H, d, J 6.9Hz), 4.84 (1H, m), 4.15 (2H, m), 4.05 (1H, m), 3.23 (1H, dd, J 13.8,4.4Hz), 3.04 (1H, dd, J 13.6,9.6Hz), 1.50-2.00 (14H, m). m/z (ES+, 70V) 650 (MH+).

The following assays can be used to demonstrate the potency and selectivity of the compounds according to the invention. In each of these assays an Iso value was determined for each test compound and represents the concentration of compound necessary to achieve 50% inhibition of cell adhesion where 100% = adhesion assessed in the absence of the test compound and 0% = absorbance in wells that did not receive cells.

α4ß1 Integrin-dependent Jurkat cell adhesion to VCAM-la 96 well NUNC plates were coated with F (ab) 2 fragment goat anti-human IgG Fcy-specific antibody [Jackson Immuno Research 109-006-098: 100 ! 11 at 2 llg/ml in 0.1 M NaHC03, pH 8.4], overnight at 4°. The plates were washed (3x) in phosphate-buffered saline (PBS) and then blocked for 1 h in PBS/1% BSA at room temperature on a rocking platform. After washing (3x in PBS) 9 ng/ml of purified 2d VCAM-Ig diluted in PBS/1% BSA was added and the plates left for 60 minutes at room temperature on a rocking platform. The plates were washed (3x in PBS) and the assay then performed at 37° for 30 min in a total volume of 200 ti containing 2.5 x 105 Jurkat cells in the presence or absence of titrated test compounds.

Each plate was washed (2x) with medium and the adherent cells were fixed with 100µl methanol for 10 minutes followed by another wash. 100R1 0.25% Rose Bengal (Sigma R4507) in PBS was added for 5 minutes at room temperature and the plates washed (3x) in PBS. 100, u1 50% (v/v) ethanol in PBS was added and the plates left for 60min after which the absorbance (570nm) was measured.

OdSy Integrin-dependent JY cell adhesion to MAdCAM-la This assay was performed in the same manner as the α4ß1 assay except that MAdCAM-Ig (150ng/ml) was used in place of 2d VCAM-Ig and a sub- line of the p-tympho blastoid cell-line JY was used in place of Jurkat cells.

The IC50 value for each test compound was determined as described in the α4ß1 integrin assay. g5fli tntegrin-dependent K562 cell adhesion to fibronectin 96 well tissue culture plates were coated with human plasma fibronectin (Sigma F0895) at 5ßg/ml in phosphate-buffered saline (PBS) for 2 hr at 37°C. The plates were washed (3x in PBS) and then blocked for 1h in 100µl PBS/1% BSA at room temperature on a rocking platform. The blocked plates were washed (3x in PBS) and the assay then performed at 37°C in a total volume of 200, u1 containing 2.5x 105 K562 cells, phorbol-12- myristate-13-acetate at 10ng/ml, and in the presence or absence of titrated test compounds. Incubation time was 30 minutes. Each plate was fixed and stained as described in the oc4pl assay above.

αmß2-dependent human polymorphonuclear neutrophils adhesion to plastic 96 well tissue culture plates were coated with RPMI 1640/10% FCS for 2h at 37°C. 2 x 105 freshly isolated human venous polymorphonuclear neutrophils (PMN) were added to the wells in a total volume of 200µl in the

presence of 10ng/ml phorbol-12-myristate-13-acetate, and in the presence or absence of test compounds, and incubated for 20min at 37#C followed by 30min at room temperature. The plates were washed in medium and 100tl 0.1% (w/v) HMB (hexadecyl trimethyl ammonium bromide, Sigma H5882) in 0.05M potassium phosphate buffer, pH 6.0 added to each well.

The plates were then left on a rocker at room temperature for 60 min.

Endogenous peroxidase activity was then assessed using tetramethyl benzidine (TMB) as follows : PMN lysate samples mixed with 0.22% H202 (Sigma) and 50µg/ml TMB (Boehringer Mannheim) in 0. 1 M sodium acetate/citrate buffer, pH 6.0 and absorbance measured at 630nm. allb/3-dependent human platelet aqareqation Human platelet aggregation was assessed using impedance aggregation on the Chronolog Whole Blood Lumiaggregometer. Human platelet-rich plasma (PRP) was obtained by spinning fresh human venous blood anticoagulated with 0.38% (v/v) tri-sodium citrate at 220xg for 10 min and diluted to a cell density of 6 x 108/ml in autologous plasma. Cuvettes contained equal volumes of PRP and filtered Tyrode's buffer (g/liter : NaCI 8.0; MgC12. H20 0.427; CaCl2 0.2; KCI 0.2; D-glucose 1.0; NaHC(O3 1.0; NaHP04. 2H20 0.065). Aggregation was monitored following addition of 2.5ZM ADP (Sigma) in the presence or absence of inhibitors.

In the above assays the preferred compounds of the invention such as the compounds of the Examples generally have ICso values in the α4ß1 and assay of 1, uM and below and in the (X4P7 assay of 5ZM and below. In the other assays featuring a integrins of other subgroups the same compounds had IC5p values of 50µM and above thus demonstrating the potency and selectivity of their action against a4 integrins.

Additionally, compounds of the invention, such as the compounds of the Examples, possess advantageous absorption properties as determined by standard tests, which make the compounds particularly suitable for oral dosing.