In the present investigation, synthetic methods of 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydro pyrimidine-(5)-1,3,4-thiadiazole-2-amine (3) and 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydro pyrimidine-(5)-1,3,4-oxadiazole-2-amine (3a) and 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydro pyrimidine-(5)-1,3,4-triazole-2-thiol derivative (3b) are described. Compound 1 is converted to carbothiamide 2 by the reaction with ethyl ester followed by thiosemicarbazide. Compound 2 acts as key intermediate for all series of the final compounds. In one pathway, 2 is converted to corresponding thiadiazole 3 by treatment with conc. H2SO4 and NH3 and compound 3a by treatment with I2 followed by KI and NaOH and compound 3b by treatment with 10 % of NaOH to furnish the final compound. Structural elucidation is accomplished by IR, 1H NMR and mass spectral data of the synthesized compounds.
在本研究中,4-芳基-6-甲基-2-氧代-1,2,3,4-四氢
嘧啶-(5)-1,3,4-
噻二唑-2-胺(3)和4-芳基-6-甲基-2-氧代-1,2,3,4-四氢
嘧啶-(5)-
1,3,4-恶二唑-2-胺(3a)和4-芳基-6-甲基-描述了2-氧代-1,2,3,4-四氢
嘧啶-(5)-1,3,4-三唑-2-
硫醇衍
生物(3b)。通过与
乙酯反应,然后与
氨基
硫脲反应,将化合物 1 转化为
硫脲 2。化合物 2 是所有系列最终化合物的关键中间体。在一种途径中,2 通过用浓溶液处理转化为相应的
噻二唑 3。 H 2 SO 4 和NH 3 以及化合物3a通过用I 2 处理,然后用KI和NaOH处理,并且化合物3b通过用10%的NaOH处理来提供最终化合物。通过合成化合物的 IR、1H NMR 和质谱数据完成结构解析。