[EN] IMPROVED PROCESS FOR THE PREPARATION OF ENTACAPONE<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE L'ENTACAPONE
申请人:SUVEN LIFE SCIENCES LTD
公开号:WO2005063693A1
公开(公告)日:2005-07-14
The invention disclosed in this application relates to an improved process for the preparation of the Entacapone which comprises. (i)reacting 3-alkoxy- 4-hydroxy-5-nitrobenzadehyde with N,N-diethylaminocyanoactamide in the presence of mild acid catalyst and a solvent at a temperature in the range of 50-115 °C, to get the 3-O-alkylated (methyl or ethyl) Entacapone and treating with acid catalysts in the presence of organic base and solvents at temperature in the range of 20-60 °C to get Entacapone.
这份申请中披露的发明涉及一种改进的恩他卡朋的制备过程,包括:(i)在温度范围为50-115°C的条件下,在温和酸性催化剂和溶剂的存在下,将3-烷氧基-4-羟基-5-硝基苯甲醛与N,N-二乙基氨基氰基乙酰胺反应,得到3-O-烷基化(甲基或乙基)恩他卡朋,并在有机碱和溶剂存在的条件下,在20-60°C的温度范围内用酸性催化剂处理,得到恩他卡朋。