Patent ID: 7968709
Filing Date: 2011-06-28
Classification: A61P,C07D

Abstract:
1. A process for preparing polymorph Form II of tanaproget, said process comprising recrystallizing tanaproget Form I from (i) methylene chloride and pentane; (ii) acetonitrile and water; or (iii) methanol and water; wherein the X-ray diffraction peak pattern for said polymorph Form II of tanaproget comprises peaks at 2θ of about 6.0°, 8.3°, 12.0°, 21.4°, and 23.4° and the X-ray diffraction peak pattern for said tanaproget Form I comprises peaks at 2θ of about 6.6°, 10.3°, 14.4°, 19.8°, 23.8°, 26.3°, and 29.1°.