摘要 : 1,2-Dihydro-2-thioxyopyrimidin-4(3H)ones 6 react with C-ethoxycarbonyl-N-arylhydrazonoyl chlorides 1 to give 1,2,4-triazolo[4,3-#alpha#]pyrimidines 11 in good yield. The latter proucts 11 react with benenediazonium chloride, nitro... 展开 1,2-Dihydro-2-thioxyopyrimidin-4(3H)ones 6 react with C-ethoxycarbonyl-N-arylhydrazonoyl chlorides 1 to give 1,2,4-triazolo[4,3-#alpha#]pyrimidines 11 in good yield. The latter proucts 11 react with benenediazonium chloride, nitrous acid, acetyl chloride and chloroacetyl chloride to give the corresponding substitution products 16-18. The structures of the newly ynthesized compounds are established on the basis of chemical and specroscopic evidence. 收起