PROCESS FOR PREPARING ZOLPIDEM HEMITARTRATE AND TARTRATE POLYMORPHS

摘要

A method for preparing a polymorph of a hemitartrate salt of a compound having the structure: comprising dissolving a free base form of the compound in a liquid medium comprising an alcohol and a tartrate derivative to form a solution comprising the compound, the alcohol, and the tartrate derivative; heating the solution to a temperature sufficient to dissolve the compound and the tartrate derivative; and cooling the solution to a temperature sufficient to precipitate the hemitartrate salt of the compound.