The invention relates to an improved process for preparation of 3-(2-hydroxy ethyl)-9- hydroxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one or its acid addition salt and its conversion to paliperidone or its acid addition salt without involving the use of an acid catalyst.
该发明涉及一种改进的制备3-(2-羟基乙基)-9-羟基-2-甲基-4H-
吡啶并[1,2-a]
嘧啶-4-酮或其酸盐加合物的过程,以及将其转化为
帕利哌酮或其酸盐加合物的方法,而不涉及使用酸催化剂。