Synthesis and Antimicrobial Activities of Some novel 1,3,4-Oxadiazoles Carrying Alkylthio and Alkylsulphonyl phenoxy Moieties
作者:T. Karabasanagouda、Airody Vasudeva Adhikari、N. Suchetha Shetty
DOI:10.1080/10426500701542981
日期:2007.10.18
chloroacetate to give ethyl [4-(alkylthio) phenoxy] acetate ( 2a–b ) which on oxidation yielded ethyl [4-(alkylsulfonyl)phenoxy]acetate ( 2c–d ). They were readily converted to the corresponding hydrazides 3a–d , and then cyclized to the title compounds 2-[4-(alkylthio/alkylsulfonyl) phenoxy] methyl}-5-aryl-1,3,4-oxadiazoles ( 4a–y ) by condensing with aromatic carboxylic acids. Further, 3a–b , on condensation
从 4-烷硫基苯酚 (1a-b) 合成了一系列新的 2-[(4-烷硫基/烷磺酰基苯氧基) 甲基]-5-取代的-1,3,4-恶二唑 4a-y , 5a-h )通过多步反应序列。化合物 1a-b 与氯乙酸乙酯反应生成 [4-(烷硫基)苯氧基] 乙酸乙酯(2a-b),氧化生成 [4-(烷基磺酰基)苯氧基]乙酸乙酯(2c-d)。它们很容易转化为相应的酰肼 3a-d,然后环化为标题化合物 2-[4-(烷硫基/烷基磺酰基)苯氧基]甲基}-5-芳基-1,3,4-恶二唑 (4a-y ) 通过与芳族羧酸缩合。此外,3a-b 与二硫化碳缩合得到标题化合物 2-[4-(烷硫基) 苯氧基]甲基}-1,3,4-恶二唑-5-硫醇(5a-b),烷基化后得到标题化合物2-[(4-烷硫基苯氧基)甲基]-1,3,4-恶二唑-5-烷基硫醇(5c-f),而与氯乙酸一起得到目标化合物2-[(4-烷硫基苯氧基)甲基]-1,3,4-恶二唑-5-硫代乙酸(5g-h