Intermediates for the synthesis of benzimidazole compounds and process for the preparation thereof
申请人:Sankyo Company Limited
公开号:EP1607385A1
公开(公告)日:2005-12-21
This invention provides a process for the preparation of a benzimidazole derivative (9) or a pharmaceutically acceptable salt thereof, by condensation of a compound of formula (6) with a compound of formula (7) in the presence of a condensing agent to afford a compound of formula (8), followed by, if necessary removal of the amino protecting group of compound (8), and then cyclization of compound (8) in the presence of an acid,
wherein R1e, R2e, R3e and R4e are each independently hydrogen, hydroxyl, alkyl, alkoxy, benzyloxy, acetoxy, trifluoromethyl or halogen, R7e is alkyl and R8e is hydrogen or an amino protecting group,
wherein R1e, R2e, R3e, R4e, R7e and R8e are as defined above,
wherein R1e, R2e, R3e, R4e, and R7e are as defined above.
本发明提供了一种制备苯并咪唑衍生物(9)或其药学上可接受的盐的工艺,其方法是:在缩合剂存在下,将式(6)化合物与式(7)化合物缩合,得到式(8)化合物,然后必要时去除化合物(8)的氨基保护基,再在酸存在下将化合物(8)环化、
其中 R1e、R2e、R3e 和 R4e 各自独立地为氢、羟基、烷基、烷氧基、苄氧基、乙酰氧基、三氟甲基或卤素,R7e 为烷基,R8e 为氢或氨基保护基、
其中 R1e、R2e、R3e、R4e、R7e 和 R8e 如上定义、
其中 R1e、R2e、R3e、R4e 和 R7e 如上定义。