申请人:Centaur Chemicals Pvt Ltd
公开号:US08106189B2
公开(公告)日:2012-01-31
An improved process for preparation of triazol-benzodiazepine derivatives, such as alprazolam, triazolam, brotizolam and etizolam, is presented. The process comprises a cyclization reaction of compound Formula B in toluene with catalytic amount of p-toluene sulphonic acid to obtain the triazol-benzodiazepine derivative of Formula C:
wherein R is,
and X is hydrogen or halogen.
本发明提供了一种改进的三唑-苯二氮平衍生物制备方法,例如阿普唑仑、三唑仑、布罗替唑和依托唑仑。该方法包括在甲苯中进行化合物B的环化反应,并使用催化量的对甲苯磺酸,以获得化合物C的三唑-苯二氮平衍生物:其中R为,X为氢或卤素。