[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF CLOBAZAM AND ITS INTERMEDIATE<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE CLOBAZAM ET SON INTERMÉDIAIRE
申请人:PIRAMAL ENTPR LTD
公开号:WO2016151464A1
公开(公告)日:2016-09-29
The present invention provides an improved process for the preparation of 8-chloro-1-phenyl- 1H-benzo[b][1,4]diazepine-2,4(3H,5H)-dione (hereafter referred to as the compound (IV)), which is useful as a key intermediate for the synthesis of Clobazam (referred to as the compound (I)) 7-chloro-1-methyl-5-phenyl-1H-benzo[b][1,4]diazepine-2,4(3H,5H)-dione. The process of the present invention further involves transformation of the compound (IV) into Clobazam (I), comprising (a) reacting the compound (II) (as described herein) with monoalkyl malonate in the presence of a coupling agent to obtain the compound (III) (as described herein); followed by the cyclization using a base; (b) reacting the compound-IV (as described herein) obtained from step (a) with methylating agent. The process of the present invention involves formation of novel intermediates methyl 3-((4- chloro-2-(phenylamino)phenyl)amino)-3-oxopropanoate (IlIa) and 3-((4-chloro-2- (phenylamino)phenyl)amino)-3-oxopropanoic acid (V).
本发明提供了一种改进的制备8-氯-1-苯基-1H-苯并[b][1,4]二氮杂环-2,4(3H,5H)-二酮(以下简称为化合物(IV))的过程,该过程用作合成氯硝安(简称为化合物(I))7-氯-1-甲基-5-苯基-1H-苯并[b][1,4]二氮杂环-2,4(3H,5H)-二酮的关键中间体。本发明的过程还涉及将化合物(IV)转化为氯硝安(I),包括(a)在偶联剂存在下将化合物(II)(如本文所述)与单烷基马隆酸酯反应,以获得化合物(III)(如本文所述);随后使用碱进行环化;(b)将从步骤(a)中获得的化合物-IV(如本文所述)与甲基化试剂反应。本发明的过程涉及新型中间体甲基3-((4-氯-2-(苯胺基)苯基)氨基)-3-氧代丙酸酯(IlIa)和3-((4-氯-2-(苯胺基)苯基)氨基)-3-氧代丙酸(V)的形成。