Novel bicyclic pyrimidin-5-one derivatives.

摘要

Novel 5H-thiazolo- and 5H-1,3,4-thiadiazolo[3,2-a]-pyrimidin-5-one and 3,4-dihydro-2H,6H-pyrimido[2.1.b] [1,3]-thiazin-6-one derivatives, which compounds are useful psychotropic agents; a method of treating psychotropic diseases by the use of said compounds; pharmaceutical compositions containing same as an active ingredient and a method of preparing said pharmaceutical compositions.