variously substituted chalcones 1 on treatment with S-benzyl isothiouronium
chloride in the presence of ethanol-morpholine/ piperidine/ pyrrolidine or
DMF give 4,6-diaryl-2-(4-morpholinyl/1-piperidinyl/1-pyrrolidinyl) pyrimid
ines 4a-p and 2-benzyl-thiopyrimidines 3 a-e in a facile one step conversio
n. An alternate synthesis of 4g, h, j, k is also described.