The present invention provides a process for preparing donepezil or a salt thereof, the process comprising reducing a 1-benzyl-4-[(5,6-dimethoxy-1-indanon-2-yl)methylene]pyridonium halide of formula II, wherein X is bromide or chloride, in the presence of an ionic compound, a solvent, a catalyst and a source of hydrogen, to form donepezil and optionally converting the donepezil to the salt thereof.
本发明提供了一种制备
多奈哌齐或其盐的方法,该方法包括在离子化合物、溶剂、催化剂和氢源的存在下,还原式II中X为
溴或
氯的1-苄基-4-[(5,6-二甲氧基-1-
吲哚酮-2-基)亚甲基]
吡啶卤化物,以形成
多奈哌齐,可选择性地将
多奈哌齐转化为其盐。