PROCESS FOR THE PREPARATION OF INTERMEDIATE COMPOUNDS OF DRUGS

摘要

A process for preparing selectively compound (I), (1S, 5S, 6R, 7R)-2-aza-7-chloro-5-methyl-3-oxobicyclo[4.1.0]-heptane, by preparing compound (II) from compound (V) through compound (III) via a series of reactions and crystallizing the obtained compound (II); and the novel intermediate compound represented by the structural formula (III) and hydrate salts thereof.