| abstract |
New heterocyclic compounds of formula (I) are described in which W represents oxygen or sulfur, R is hydrogen, halogen, amino group or C3-10-cycloalkyl, G is unsaturated het-1 to het-7, ir is 0,1 or Z Also described is a process for the preparation of these compounds and pharmaceutical compositions containing them, which are used as stimulators of the cognitive function of the mammalian forebrain and hippocampus, in particular in the treatment of Alzheimer's disease. |