By the reaction of 4-methyl-4H-1,2,4-triazole-3-thiol with ethyl bromoacetate, ethyl [(4-methyl-4H-1,2,4-triazol-3-yl)sulfanyl]acetate (1) was obtained. This compound was converted to [(4-methyl-4H-1,2,4-triazol-3-yl)sulfanyl]acetohydrazide (2). In the reaction of 2 with isothiocyanates, new thiosemicarbazides 3a-3g were obtained. The cyclization of 3a-3g in 2% aqueous solution of sodium hydroxide led to the formation of 4H-1,2,4-triazole-3(2H)-thione derivatives 4a-4g, whereas the cyclization in acid media led to the formation of 2-amino-1,3,4-thiadiazole derivatives 5a-5g. Molecular structure was confirmed by X-ray structure analysis of 3a, 4g, 5a and 5g. Compounds 4a, 4b and 4g were investigated pharmacologically to determine their effect on the central nervous system (CNS) in mice.
通过4-甲基-4H-1,2,4-三唑-3-硫醇与溴乙酸乙酯的反应,得到了乙基[(4-甲基-4H-1,2,4-三唑-3-基)硫酰基]乙酸酯(1)。该化合物转化为[(4-甲基-4H-1,2,4-三唑-3-基)硫酰基]乙酰肼(2)。在2%的氢氧化钠水溶液中,化合物2与异硫氰酸酯反应,得到新的硫代半脲类化合物3a-3g。化合物3a-3g在酸性介质中环化反应,得到2-氨基-1,3,4-噻二唑类衍生物5a-5g。在2%的氢氧化钠水溶液中,化合物3a-3g环化反应,得到4H-1,2,4-三唑-3(2H)-硫醇衍生物4a-4g。通过X射线结构分析证实了分子结构,其中包括3a,4g,5a和5g。对化合物4a,4b和4g进行了药理学研究,以确定它们对小鼠中枢神经系统的影响。