Process for the preparation of intermediate compounds of drugs.

摘要

The present invention relates to a process for preparing selectively compound (I), (1S, 5S, 6R, 7R)-2-aza-7-chloro-5-methyl-3-oxobicycloÄ4.1.0Üheptane, by preparing compound (II) from compound (V) through compound (III) via a series of reactions, and by crystallizing the obtained compound (II); and the novel intermediate compound represented by the structural formula (III) and hydrate salts thereof.