Patent ID: 7473780
Filing Date: 2009-01-06
Classification: A61P,C07D

Abstract:
1. A process for preparing crystalline famciclovir, comprising: a) providing a wet crystalline form of famciclovir containing from about 15% to about 40% (wt/wt) solvent; b) drying the wet crystalline form of famciclovir of step a) at a temperature of from about 30° C. to about 50° C. to obtain a wet crystalline form of famciclovir; and c) drying the wet crystalline form obtained from step b) at a temperature higher than 50° C. to obtain a crystalline form of famciclovir containing less than 1% (wt/wt) solvent; wherein the wet crystalline form of famciclovir obtained in step b) contains less than 15% (wt/wt) solvent.