N-[3-(3-cyanopyrazolo[1,5-a]pyrimidin-5-yl)phenyl]-N-ethylacetamide and crystalline forms of zaleplon

摘要

Zaleplon crystalline Forms II, III, IV and V are useful for the treatment of insomnia. These crystalline Forms are described along with processes for making them by crystallization from selected solvents. A regioisomer of zaleplon is useful as a reference standard for monitoring the composition of production batches of zaleplon.