| abstract |
There are described compounds of the formula <IMAGE> where n is 1,2 or 3; R1 is hydrogen, formyl, loweralkylcarbonyl, arylloweralkylcarbonyl, loweralkyl, arylloweralkyl, <IMAGE> R5 and R6 being independently loweralkyl or alternatively the group <IMAGE> taken as a whole is <IMAGE> +TR <IMAGE> R2 is hydrogen, loweralkyl, loweralkenyl, arylloweralkyl, -CH2C 3BOND CH, <IMAGE> +TR <IMAGE> R7 and R8 being independently loweralkyl or alternatively the group <IMAGE> taken as a whole is <IMAGE> R3 is hydrogen or loweralkyl; and R4 is hydrogen or loweralkyl; which compounds are useful as analgesic agents and also for treating various memory dysfunctions. |