高效一锅合成高官能度的多取代苯并[ b ]噻吩及其杂合类似物,如噻吩并[2,3- b ]噻吩,吲哚并[2,3- b ]噻吩和吡唑并[3,2] - ç ]噻吩,已有报道。总体策略涉及2-溴己基(芳基)乙腈前体与(杂)芳基/烷基二硫代酯或其他硫代羰基化合物如三硫代碳酸二甲酯,S-甲基黄原酸酯,N-咪唑基二硫代甲基酯,N-烷基二硫代氨基甲酸酯和苯基异硫氰酸酯,然后分子内铜催化的原位生成的烯硫醇酯的芳硫基化,以高收率提供了各种2-官能化的3-氰基苯并[ b ]-和/或杂稠噻吩。
A Novel Radical Cyclization Approach to Thieno-Fused Heterocycles
作者:Prabal P. Singh、Ashok K. Yadav、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1002/ejoc.201100516
日期:2011.7
efficient synthesis of novel aryl/heteroaryl-substituted thieno-fused heterocycles, that is, thieno[2,3-b]thiophenes, thieno[2,3-b]indoles, and pyrazolo[3,2-c]thiophenes, involving radical-mediated cyclization of 2-(2-bromoheteroaryl)-3-methylthio-3-aryl/heteroaryl acrylonitriles has been reported.