There are disclosed various compounds of the formula below, <IMAGE> where X is O, S, NH, N-loweralkyl, or N-arylloweralkyl; Y is hydrogen, fluorine, chlorine, bromine, nitro, loweralkyl, loweralkoxy, or triloweralkylsilyl; R1 is loweralkyl, halogen-substituted loweralkyl, aryl, arylloweralkyl, cycloalkyl, heteroaryl or heteroarylloweralkyl; R2 is hydrogen, loweralkyl or arylloweralkyl; R3 is loweralkyl or arylloweralkyl; R4 is hydrogen, loweralkyl, loweralkenyl, loweralkynyl, arylloweralkyl, formyl, loweralkylcarbonyl, arylloweralkylcarbonyl or loweralkoxycarbonyl; R5 is hydrogen or loweralkyl; and m is 0 or 1, with the proviso that when m is O, R1 may also be hydrogen. which compounds are useful for alleviating various memory dysfunctions characterized by a cholinergic deficit such as Alzheimer's disease.
Hexahydropyrrolo(2,3-B)indole carbamates, ureas, amides and related compounds