Title:
【発明の名称】除草剤スルホニル尿素の製造法および中間体生成物としてのN-(ピリミジニル)-カーバメートまたはN-(トリアジニル)-カーバメートの製造法
Document Type and Number:
Japanese Patent JP2002519994
Kind Code:
A
Abstract:
Disclosed and claimed is a process for the preparation of a carbamate (IV)Ar-O-CO-NR-B(IV)by reaction of a saltM(+) (-)NR-B(II-S)with a diaryl carbonate(ArO)2CO(III).The carbamate can be reacted, without any necessity of intermediate isolation, with a sulfonamide A-SO2NH2 (V) to give a sulfonylurea (I) or salts thereofA-SO2-NH-CO-NR-B(I).And thus, disclosed and claimed too is a process for the preparation of sulfonylurea (I) by (i) contacting a salt (II-S) with a diaryl carbonate (III) to form a carbamate (IV), and (ii) contacting carbamate (IV) from step (i) with or without intermediate isolation, with a sulfonamide (V). These processes avoid the use of alkali metal hydrides as a base. And, these processes can additionally include the preparation of salt (II-S) from a compound H-NR-B (II) and base M(+)Base(-).
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Inventors:
Schüner Bell, Gerhard
Knorr, Harald
Min, Clemens
Fuermelen, Yang
Knorr, Harald
Min, Clemens
Fuermelen, Yang
Application Number:
JP50720597A
Publication Date:
July 02, 2002
Filing Date:
July 22, 1996
Export Citation:
Assignee:
Hoechst Schering Aggrebo Gezershaft Mitt Besilenktel Haftung
International Classes:
A01N47/36; C07D239/46; C07D239/42; C07D239/47; C07D251/16; C07D251/42; C07D521/00; A01P13/00; (IPC1-7): C07D239/47; C07D251/16
Attorney, Agent or Firm:
Chika Takagi (2 outside)