Drying process for preparing crystalline solid famciclovir

Details Drying process for preparing crystalline solid famciclovir Drying process for preparing crystalline solid famciclovir

C - Chemistry, Metallurgy

07

D

C07D 473/32 (2006.01)

Patent

CA 2566803

The present invention provides a drying process for preparing crystalline solid famciclovir form I comprising the steps of: (i) preparing a wet crystalline form of famciclovir; (ii) drying the wet crystalline form of famciclovir at a temperature of below 50~C until the crystalline form contains less than 15% (wt/wt) wetness; and (iii) drying the wet crystalline form of famciclovir at a temperature of above 50~C until the wet crystalline form of famciclovir contains less than 0.05% (wt/wt) water to obtain crystalline solid famciclovir form I.

La présente invention fournit un processus de séchage pour préparer une forme I de famciclovir solide cristalline comprenant les étapes suivantes : (i) préparation d'une forme cristalline humide de famciclovir ; (ii) séchage de la forme cristalline humide de famciclovir à une température inférieure à 50 ·C jusqu'à ce que la forme cristalline contienne moins de 15% (poids/poids) d'humidité ; (iii) séchage de la forme cristalline humide de famciclovir à une température supérieure à 50 ·C jusqu'à ce que la forme cristalline humide du famciclovir contienne moins de 0,05% (poids/poids) d'eau pour obtenir une forme I de famciclovir solide cristalline.

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