Processes for the Preparation of Zolpidem and its Hemitartrate

摘要

The invention relates to the preparation of a non-hygroscopic polymorphic form of zolpidem hemitartrate, designated as Form I, and pharmaceutical compositions including it. The invention also relates to use of the compositions for treating anxiety, sleep disorders and convulsions. The invention also relates to a process for the preparation of zolpidem or pharmaceutically acceptable salts thereof by condensing 3-bromo-N,N-dimethyl-4-oxo-4-p-tolyl-butyramide with 2-amino-5-methylpyridine in a polar aprotic solvent.