The invention disclosed in this application relates to an improved process for the preparation of Entacapone. In one embodiment the process involves: (i) reacting a 3-alkoxy-4-hydroxy-5-nitrobenzadehyde with N,N-diethylaminocyanoacetamide in the presence of a mild acid catalyst and a solvent, to provide a 3-O-alkylated Entacapone, and treating the 3-O-alkylated Entacapone with an acid catalyst in the presence of an organic base to provide Entacapone.
这个申请中披露的发明涉及一种改进的恩他卡韦制备工艺。在一个实施例中,该工艺包括:(i) 在温和酸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
丙腈反应,得到3-O-烷基化的恩他卡韦,并在有机碱的存在下,用酸催化剂处理3-O-烷基化的恩他卡韦,得到恩他卡韦。