[EN] PROCESS FOR THE PREPARATION OF MIDODRINE, PHARMACEUTICALLY-ACCEPTABLE SALTS THEREOF AND INTERMEDIATES<br/>[FR] PROCEDE POUR PREPARER DE LA MIDODRINE, DES SELS PHARMACEUTIQUEMENT ACCEPTABLES DE CELLE-CI ET DES PRODUITS INTERMEDIAIRES
申请人:APOTEX PHARMACHEM INC
公开号:WO2004080946A1
公开(公告)日:2004-09-23
The present invention provides for a novel process for the preparation of Midodrine or a pharmaceutically acceptable salt thereof comprising: (a) a step of reacting 2-amino-1-(2’,5’-dimethoxyphenyl) ethanol of formula (I) with an N-protected glycine of formula (II) containing an amino protecting group in the presence of 1,1’-carbonyldiimidazole (CDI); and (b) removing the amino protecting group by deprotection formula (I), formula (II), wherein R1 is a benzyl, triphenylmethyl, tert-butyloxycarbonyl, or a benzyloxycarbonyl group. This results in an unexpectedly efficient and cost-effective process. Additionally, the process is simple and safe as all the intermediates and reagents involved in the process pose no safety risks. Further reaction of Midodrine with a pharmaceutically acceptable acid affords a pharmaceutically acceptable salt thereof. Preferably, the pharmaceutically acceptable salt obtained from the process according to the present invention is Midodrine Hydrochloride.
本发明提供了一种新颖的制备米多吡嗪或其药用可接受盐的方法,包括:(a)将式(I)的2-氨基-1-(2',5'-二甲氧基苯基)乙醇与式(II)的含有氨基保护基的N-保护甘氨酸在1,1'-碳酰亚胺(CDI)存在下反应;以及(b)通过去保护式(I)、式(II)中的氨基保护基去除氨基保护基,其中R1是苄基、三苯甲基、叔丁氧羰基或苄氧羰基基团。这导致了一种出乎意料的高效且具有成本效益的过程。此外,该过程简单且安全,因为过程中涉及的所有中间体和试剂均不带来安全风险。米多吡嗪与药用可接受酸的进一步反应得到其药用可接受盐。根据本发明的方法得到的药用可接受盐最好是米多吡嗪盐酸盐。