1,2,4-Triazolo[4,3-a]pyrimidines, thiadiazolines and selenadiazolines synthesized via reactions of hydrazonoyl halides with each of ethyl 4-(3,4-dimethoxyphenyl)-6-methyl-2-methylthio-3,4-dihydropyrimidine-5-carboxylate (or ethyl 6-(3,4-dimethylphenyl)-4-methyl-2-thio1,3,6-trihydropyrimidine-5-carboxylate), ethyl 4-(2,3-dimethoxyphenyl)- 6-methyl-2-methylthio-3,4-dihydropyrimidine-5-carboxylate, potassium
1,2,4-三唑并[4,3-a]
嘧啶、
噻二唑啉和
硒二唑啉通过腙
酰卤与4-(3,4-二
甲氧基苯基)-6-甲基-2-甲
硫基-3,4
乙酯反应合成-dihydropyrimidine-5-carboxylate (或 6-(3,4-二甲基苯基)-4-methyl-2-thio1,3,6-trihydropyrimidine-5-carboxylate), 乙基 4-(2,3-dimethoxyphenyl)-6 -methyl-2-methylthio-3,4-dihydropyrimidine-5-carboxylate、
硫氰酸钾、
硒氰酸钾和碳二
硫代酸
钾分别。