A process for preparing crystalline form I of donepezil hydrochloride comprises: a) condensing 5,6-dimethoxy-2-piperidin-4-yl-methyl-indan-1-one with benzyl bromide and reacting a condensation product with hydrobromic acid to form donepezil hydrobromide; and b) hydrolyzing donepezil hydrobromide, followed by reacting with aqueous hydrochloric acid.
制备
多奈哌齐盐酸盐的I型晶体的方法包括:a)将5,6-二甲氧基-2-
哌啶基-4-甲基-
茚-1-酮与苄
溴化物缩合,然后用
氢溴酸反应生成
多奈哌齐溴化物;b)
水解
多奈哌齐溴化物,然后与
水溶
盐酸反应。