已经描述了一种有效且温和的 KO t Bu 促进的邻碘硫代苯胺的分子内 C-S 交叉偶联以及催化量的菲咯啉作为添加剂,用于方便地合成 2-取代苯并噻唑。该方法适用于获得多种 2-烷基和 2-芳基取代的苯并噻唑。单晶 XRD、DFT 计算、NMR 和 UV 研究表明,邻碘硫代苯胺单元之间的卤素键可能有助于电子转移过程。
Metal-Free Synthesis of 2-Substituted (N, O, C) Benzothiazoles via an Intramolecular C−S Bond Formation
作者:Enguang Feng、He Huang、Yu Zhou、Deju Ye、Hualiang Jiang、Hong Liu
DOI:10.1021/cc9001839
日期:2010.7.12
convenient method was developed for the preparation of 2-substituted (N, O, C) benzothiazoles from N'-substituted-N-(2-halophenyl)thioureas, O'-substituted-N-(2-halophenyl) carbamothioates, or N-(2-halophenyl) thioamides via a base-promoted cyclization in dioxane without any transition metal. A one-pot variant combining the synthesis of the thiourea and the cyclization was also demonstrated. High yields