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。
Visible-light-promoted cascade cyclization towards benzo[<i>d</i>]imidazo[5,1-<i>b</i>]thiazoles under metal- and photocatalyst-free conditions
2-haloaryl isothiocyanates and isocyanides to access benzo[d]imidazo[5,1-b]thiazoles has been realized efficiently under metal- and photocatalyst-free conditions. The reaction mechanism was explored by several preliminary experiments involvingreactive intermediate, free radical inhibitors, and corresponding photoelectric spectra. This protocol possesses some advantages over the previous methods such as
在无金属和无光催化剂的条件下,已经有效地实现了可见光促进的2-卤代芳基异硫氰酸酯和异氰酸酯的级联环化反应,以接近苯并[ d ]咪唑并[5,1- b ]噻唑。通过涉及反应性中间体,自由基抑制剂和相应的光电光谱的几个初步实验探索了反应机理。该方案相对于先前的方法具有一些优势,例如易于获得和廉价的底物,无金属催化剂,步骤和原子经济,反应条件温和。
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
Copper(<scp>ii</scp>)-catalyzed cascade Csp<sup>2</sup>–P/C–C bond formation to construct benzo[<i>d</i>]thiazol-2-ylphosphonates
作者:Han Wang、Le Huang、Jun Li、Wenyan Hao
DOI:10.1039/d3ob01256e
日期:——
A novel, copper(II)-catalyzed cascade Csp2–P/C–C bond formation in o-haloaryl isothiocyanates with organophosphorus esters has been developed under mild conditions. A series of benzo[d]thiazol-2-ylphosphonates were synthesized in moderate to good yields. Different from the traditional method of obtaining these scaffolds with radical reactions, the method proposed allows accessing them via ionic reactions
一种新型的铜( II )催化级联Csp 2 –P/C–C键形成在邻卤代芳基异硫氰酸酯与有机磷酯中在温和条件下被开发出来。以中等至良好的产率合成了一系列苯并[ d ]噻唑-2-基膦酸酯。与传统通过自由基反应获得这些支架的方法不同,该方法可以通过离子反应获得它们,具有原料易得、操作简单的优点。最后,我们进行了克级实验,以进一步证明该策略在苯并[ d ]噻唑-2-基膦酸酯的高效合成中的可扩展性。