The present invention relates to a production method of optically active 2-[(N-benzylprolyl)amino]-5-chlorobenzophenone (3) or a salt thereof, which includes reacting optically active N-benzylproline (1) with 2-amino-5-chlorobenzophenone (2) in acetonitrile and in the presence of an amide compound and thionyl chloride. According to the method of the present invention, optically active 2-[(N-benzylprolyl)amino]-5-chlorobenzophenone (3) or a salt thereof can be conveniently produced at a high purity and in a high yield:
wherein * shows an asymmetric carbon atom and the configuration of the asymmetric carbon atom is S or R.
本发明涉及一种光学活性2-[(N-苄基丙
氨基)-5-
氯苯基]苯酮(3)或其盐的生产方法,包括在
乙腈和酰胺化合物以及
氯化亚砜的存在下,将光学活性N-苄基脯
氨酸(1)与2-
氨基-5-
氯苯基苯酮(2)反应。根据本发明的方法,可以方便地高纯度、高产率地生产光学活性2-[(N-苄基丙
氨基)-5-
氯苯基]苯酮(3)或其盐。其中*表示一个不对称碳原子,其立体构型为S或R。