Intermediates for the synthesis of benzimidazole derivatives and a process for the preparation thereof
    1.
    发明授权
    Intermediates for the synthesis of benzimidazole derivatives and a process for the preparation thereof 失效
    用于合成苯并咪唑衍生物的中间体及其制备方法

    公开(公告)号:US06753347B2

    公开(公告)日:2004-06-22

    申请号:US10272133

    申请日:2002-10-16

    IPC分类号: A61K3121

    摘要: This invention provides a process for the preparation of a benzimidazole derivative (I) or a pharmaceutically acceptable salt thereof, wherein R1 is C1-C6 alkyl, C1-C6 alkoxyl, etc., R2 is C1-C6 alkyl, and R3 is hydrogen or a protecting group, which exhibits excellent hyopoglycemic action, said process comprising condensation of an amine derivative (III) with a carboxylic acid derivatives (II) to afford a compound (IV), followed by cyclization of compound (IV) in the presence of an acid.

    摘要翻译: 本发明提供了制备苯并咪唑衍生物(I)或其药学上可接受的盐的方法,其中R 1是C 1 -C 6烷基,C 1 -C 6烷氧基等,R 2是C 1 -C 6烷基 ,并且R 3是氢或保护基,其表现出优异的血压作用,所述方法包括将胺衍生物(III)与羧酸衍生物(II)缩合,得到化合物(IV),然后环化 化合物(Ⅳ)在酸存在下反应。