[EN] ENANTIOMERIC RESOLUTION METHOD<br/>[FR] PROCÉDÉ DE RÉSOLUTION ÉNANTIOMÉRIQUE
申请人:PULMAGEN THERAPEUTICS INFLAMMATION LTD
公开号:WO2011015868A1
公开(公告)日:2011-02-10
A method for the preparation of pioglitazone O,O'-dibenzoyl-L-tartrate wherein the content by weight of pioglitazone consists of at least 95 % by weight of the 5R enantiomer and less than 5 % of the 5S enantiomer, which method comprises: (1a) adding seed crystals of 5R- pioglitazone O,O'-dibenzoyl-l-tartrate to a rnethanol-water solution of racemic pioglitazone hydrochloride and O,O'-dibenzoyI-L-tartaric acid, thereby precipitating pioglitazone O,O'- dibenzoyl-L-tartrate;(1b) recovering said precipitate from step (1a); (1c) forming a solution of the precipitate from step (1b) in a solvent mixture of methanol, acid and water and mixing into to the resultant solution seed crystals of 5R-pioglitazone O,O'-dibenzoyl-L-tartrate, thereby precipitating pioglitazone O,O'-dibenzoyl-L-tartrate; (1d) recovering said precipitate from step (1c); (1e) repeating steps (1c) and (1d), the recovered product being the desired pioglitazone O,O'-dibenzoy! tartrate wherein the content by weight of pioglitazone consists of at least 95 % by weight of the 5R enantiomer and less than 5 % of the 5S enantiomer. Also disclosed is a modification of the method in which step 1(e) is omitted.
一种制备吡格列酮O,O'-双苯甲酰-L-酒石酸盐的方法,其中吡格列酮的重量含量至少为其5R对映体的95%重量,5S对映体的含量少于5%,该方法包括:(1a)将5R-吡格列酮O,O'-双苯甲酰-L-酒石酸晶种加入到外消旋吡格列酮盐酸盐和O,O'-双苯甲酰-L-酒石酸的甲醇-水溶液中,从而沉淀吡格列酮O,O'-双苯甲酰-L-酒石酸盐;(1b)从步骤(1a)中回收所述沉淀物;(1c)在甲醇、酸和水的溶剂混合物中形成步骤(1b)中的沉淀物的溶液,并将5R-吡格列酮O,O'-双苯甲酰-L-酒石酸晶种混入到所得溶液中,从而沉淀吡格列酮O,O'-双苯甲酰-L-酒石酸盐;(1d)从步骤(1c)中回收所述沉淀物;(1e)重复步骤(1c)和(1d),回收的产品即为所需的吡格列酮O,O'-双苯甲酰-L-酒石酸盐,其中吡格列酮的重量含量至少为其5R对映体的95%重量,5S对映体的含量少于5%。还揭示了一种修改该方法的步骤,其中省略了步骤1(e)。