[EN] AN IMPROVED PROCESS FOR PREPARATION OF (2E)-2-CYANO-3-(3,4- DIHYDROXY-5-NITROPHENYL)N,N-DIETHYL-2-PROPENAMIDE POLYMORPHIC FORM A<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE LA FORME POLYMORPHE A DU (2E)-2-CYANO-3-(3,4-DIHYDROXY-5-NITROPHÉNYL)-N,N-DIÉTHYL-2-PROPÈNAMIDE
申请人:NEULAND LAB LTD
公开号:WO2009084031A2
公开(公告)日:2009-07-09
The present invention relates to an improved, cost effective, eco-friendly and easy t handle process to manufacture substantially pure form of (2E)-2-Cyano-3-(3,4-dihydroxy-5 nitrophenyl)-N,N-diethyl-2-propenamide or (E)- N,N-diethyl-2-cyano-3-(3,4-dihyroxy-5 nitroρhenyl)-acrylamide polymorphic form A commonly known as (E)-Entacapone represente by Formula I, using ammonium acetate as a base.