Following a research program on piperazinoalkyl-substituted tricyclic
purines, a number of N-9-aryl(alkyl)piperazinopropyl substituted tetra
hydropyrimido-[2,1-f]-purines were synthesized and tested pharmacologi
cally with respect to their influence on the central nervous system. T
wo of the new compounds induced hypothermia and decreased the spontane
ous locomotor activity of mice.