three-component tandem reaction has been developed for the convenient and practical synthesis of 1,4-benzothiazines. A variety of terminal alkynes and 2-iodo/bromophenyl isothiocyanates underwent this one-potcyclization with aqueous ammonia to afford 1,4-benzothiazines in moderate to good yields.
Copper(I)-catalyzed cascade reaction of 2-haloaryl isothiocyanates with isocyanides: a strategy to construct benzo[d]imidazo[5,1-b]thiazoles
作者:Wenyan Hao、Xiaoyan Sang、Jing Jiang、Mingzhong Cai
DOI:10.1016/j.tetlet.2016.02.084
日期:2016.3
A copper(I) catalyzed cascadereaction of 2-haloaryl isothiocyanates with isocyanides for the construction of benzo[d]imidazo[5,1-b]thiazoles has been demonstrated. Good to excellent yields could be achieved. This [3+2] cycloaddition and C–S coupling reaction represents an extremely simple way to construct benzo[d]imidazo[5,1-b]thiazoles.
已经证明了铜(I)催化2-卤代芳基异硫氰酸酯与异氰酸酯的反应,可用于构建苯并[ d ]咪唑并[5,1- b ]噻唑。可以实现良好的优良收率。这种[3 + 2]环加成反应和CS偶联反应是构建苯并[ d ]咪唑并[5,1- b ]噻唑的一种极其简单的方法。
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