Pyrimidin-4-one-2-thione (3) was synthesized via the reaction of thiourea (1) with ethyl benzoylacetate (2) and was taken as a starting material for the present study via its reactions with the halogen-containing reagents 6a-d and lOa-c to give the corresponding thiazolopyrimidines 8, 9 and 12a-c. The 2-hydrazino derivatives 5 were synthesized either via the reaction of 3 or 4 with hydrazine hydrate. Compound 5 reacted with 6a-c and lOa-c to give the corresponding pyrimidotriazines 17a-c and 19 respectively. Also, compound 5 reacted with the active methylene-containing reagents 13 and 2a,b to give the corresponding 2-pyrazolopyrimidines 15 and 22a,b respectively. On the other hand, the triazolopyrimidines 21a,b and 30a,b were also obtained via the reaction of 5 with each of formic acid, acetic anhydride, ethyl chloroformate and carbon disulfide respectively. Some of the newly synthesized heterocyclic derivatives were tested for their biological activity
通过将硫脲(1)与乙基苯甲酰乙酸酯(2)反应合成了嘧啶-4-酮-2-硫酮(3),并将其作为起始物质与含卤素试剂6a-d和lOa-c反应,得到相应的噻唑嘧啶类化合物8、9和12a-c。2-叠氮衍生物5可以通过3或4与叠氮酸水合物反应合成。化合物5与6a-c和lOa-c反应,得到相应的嘧啶三嗪类化合物17a-c和19。此外,化合物5与含活性亚甲基的试剂13和2a、b反应,分别得到相应的2-吡唑嘧啶类化合物15和22a、b。另外,三唑嘧啶类化合物21a、b和30a、b也是通过5分别与甲酸、乙酸酐、氯甲酸乙酯和二硫化碳反应而获得的。一些新合成的杂环衍生物已经进行了生物活性测试。