There are disclosed compounds having the formula ##STR1## where n is 1, 2 or 3; X is hydrogen, loweralkyl, loweralkoxy, halogen, hydroxy, nitro or trifluoromethyl R.sub.1 and R.sub.2 are each independently hydrogen, lower alkyl or arylloweralkyl, but both may not be arylloweralkyl simultaneously; R.sub.3 and R.sub.4 are each independently hydrogen, lower alkyl, arylloweralkyl, formyl or lower alkylcarbonyl, or alternatively the group --NR.sub.3 R.sub.4 taken as a whole constitutes ##STR2## stereo isomers thereof and pharmaceutically acceptable acid addition salts thereof, which are useful for the treatment of various memory dysfunctions characterized by decreased cholinergic function, such as Alzheimer's disease.
揭示了具有以下
化学式的化合物##STR1##其中n为1、2或3;X为氢、低烷基、低烷氧基、卤素、羟基、硝基或三
氟甲基;R.sub.1和R.sub.2分别独立地为氢、低烷基或芳基低烷基,但两者不能同时为芳基低烷基;R.sub.3和R.sub.4分别独立地为氢、低烷基、芳基低烷基、甲酰基或低烷基羰基,或者作为整体--NR.sub.3 R.sub.4组成##STR2##的立体异构体及其药学上可接受的酸盐,用于治疗由于
胆碱能功能减少而表现为各种记忆功能障碍的疾病,如阿尔茨海默病。