Synthesis and antimicrobial activities of some novel 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles and 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazines carrying thioalkyl and sulphonyl phenoxy moieties
作者:T. Karabasanagouda、Airody Vasudeva Adhikari、N. Suchetha Shetty
DOI:10.1016/j.ejmech.2006.10.010
日期:2007.4
Thirty one new 6-aryl-3-(4-substituted phenoxy) methyl}-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles (6a-s) and 6-aryl-3-[(4-substituted phenoxy methyl]-7H-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazines (7a-l) have been synthesized from 4-thioalkyl phenols (1a-b) through a multi-step reaction sequence. Compounds 1a-b reacted with ethyl chloroacetate in presence of acetone and potassium carbonate to give ethyl
(2a-c)与水合肼在含2- [4-硫代苯氧基]乙酰肼(3a-b)和2- [4-甲基磺酰基苯氧基]乙酰肼(3c)的醇介质中的反应,用二硫化碳和甲醇处理氢氧化钾产生相应的二硫代氨基甲酸钾(4a-c)。然后将它们转化为4-氨基-5-[(4-硫代烷基苯氧基)甲基] -4H-1,2,4-三唑-3-硫醇(5a-b)和4-氨基-5-[(4-甲基磺酰基苯氧基)甲基] -4H-1,2,4-三唑-3-硫醇(5c)与水合肼一起回流。通过在氯氧化磷存在下将5a-c与各种芳族羧酸缩合来制备标题化合物6a-s。中间体5a-c与各种取代的苯甲酰溴缩合后得到一系列标题化合物(7a-1)。基于其元素分析,IR,(1)H NMR,(13)C NMR和质谱数据,确定了新化合物2a-7l的结构。对所有标题化合物进行了针对四种致病菌株的体外抗菌测试以及针对三种真菌的抗真菌筛选。初步结果表明,其中一些表现出有希望的活性,它们作为潜在的抗菌剂应得到更多的考虑。