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。
Synthesis of Substituted Benzo[<i>b</i>]thiophenes via Base-Promoted Domino Condensation–Intramolecular C–S Bond Formation
作者:Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.orglett.1c00085
日期:2021.3.5
A novel synthesis of 2,3-substituted benzothiophenes is reported, involving a tandem base-mediated condensation of o-iodoarylacetonitriles/acetates/ketones with (hetero)aryldithioesters and an intramolecular C–S bond formation. The reaction affords diversely substituted benzothiophenes and heterofused thiophenes in excellent yields.
Novel Route to 2,3-Substituted Benzo[<i>b</i>]thiophenes via Intramolecular Radical Cyclization
作者:Prabal P. Singh、A. K. Yadav、H. Ila、H. Junjappa
DOI:10.1021/jo900615p
日期:2009.8.7
A novel route to 2,3-substituted benzo[b]thiophenes by intramolecular radical cyclization of polarized ketene dithioacetals derived from o-bromoarylacetonitriles or the corresponding 3-(methylthio)-3-alkyl/aryl/heteroaryl analogues has been reported.
已经报道了通过衍生自邻-溴芳基乙腈或相应的3-(甲硫基)-3-烷基/芳基/杂芳基类似物的极化的烯酮二硫缩醛的分子内自由基环化形成2,3-取代的苯并[ b ]噻吩的新途径。
Onyamboko, N. V.; Weber, R.; Fauconnier, A., Bulletin des Societes Chimiques Belges, 1983, vol. 92, # 1, p. 53 - 60
作者:Onyamboko, N. V.、Weber, R.、Fauconnier, A.、Renson, M.
DOI:——
日期:——
RUDORF W.-D.; SCHIERHORN A.; AUGUSTIN M., J. PRAKT. CHEM., 1979, 321, NO 6, 1021-1028