| abstract |
ABSTRACT OF THE DISCLOSURE The invention relates to novel compounds of the formula where X is H, halogen, loweralkyl, loweralkoxy, -CF3, or -OH; R is H, loweralkyl, arylloweralkyl, diarylloweralkyl, loweralkanoyl, arylloweralkanoyl or diarylloweralkanoyl; and R1 is H2, O or -NR2R3, R2 and R3 being independently H or loweralkyl, or taken together with the nitrogen atom to which they are attached constitute , R4 in turn being H, loweralkyl, hydroxyloweralkyl, aryl, arylloweralkyl or diarylloweralkyl or pharmaceutically acceptable acid addition salts thereof, which are useful for enchancing memory. The invention relates further to a process and intermediates for the preparation of the above compounds. |