Convenient Synthesis of 3-Substituted Benzo[<i>b</i>]thiophenes by Iodine-Mediated Cyclization of α-Substituted 2-(1-Phenylethylthio)styrenes
作者:Kazuhiro Kobayashi、Daizo Nakamura、Kazuna Miyamoto、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1246/bcsj.80.1780
日期:2007.9.15
preparation of 3-substituted benzo[b]thiophenes was developed. α-Substituted 2-(1-phenylethylthio)styrenes, which could easily be prepared from 2-mercaptophenyl ketones or benzenethiols in two or three steps, respectively, underwent 5-endo cyclization on treatment with iodine in the presence of sodium hydrogencarbonate in acetonitrile at room temperature to give 3-substituted benzo[b]thiophenes in fair to
开发了一种新的、方便的制备 3-取代苯并[b]噻吩的方法。α-取代的 2-(1-苯乙硫基)苯乙烯可以很容易地分别由 2-巯基苯基酮或苯硫醇分两步或三步制备,在乙腈中碳酸氢钠存在下,用碘处理后进行 5-内环化反应。在室温下以一般到良好的产率得到 3-取代的苯并 [b] 噻吩。