申请人:Lek Pharmaceuticals D.D.
公开号:EP2128133A1
公开(公告)日:2009-12-02
The present invention describes a process for producing ezetimibe (EZT) from a protected compound, including a step of deprotecting the 4-(p-hydroxyphenyl) protection group by catalytic hydrogenation, wherein the catalyst is used in an amount of 0.7 wt.-% or lower, relative to the weight of the compound used for the deprotection reaction. After carrying out a step of deprotection reaction, the process preferably comprises: (a) the reaction product is dissolved or extracted in ethyl acetate, and (b) the ethyl acetate solution is washed with an aqueous salt solution. The invention further describes a process for obtaining pure EZT, wherein raw EZT is dissolved in a solvent at a concentration of lower than 0.1 g/ml, and a crystallization step is carried out from this solution. These measures, respectively alone and particularly in combination contribute to attain ezetimibe (EZT) free of critical impurities described herein, and thus to use exceptionally pure ezetimibe (EZT) to be formulated into a pharmaceutical composition together with a pharmaceutically acceptable carrier or excipient.
本发明描述了一种从受保护的化合物生产依折麦布(EZT)的过程,包括通过催化氢化去除4-(对-羟基苯基)保护基团的步骤,其中催化剂的用量相对于用于脱保护反应的化合物的重量为0.7重量百分比或更低。在完成脱保护反应步骤后,该过程优选包括:(a)将反应产物溶解或提取在乙酸乙酯中,以及(b)用含水的盐溶液洗涤乙酸乙酯溶液。本发明进一步描述了一种获得纯净EZT的过程,其中将原始EZT溶解在浓度低于0.1克/毫升的溶剂中,并从此溶液中进行结晶步骤。这些措施分别单独使用,特别是结合使用,有助于获得不含本文所述关键杂质的依折麦布(EZT),从而可以使用异常纯净的依折麦布(EZT)与药用辅料或赋形剂一起配制成药物组合物。