Ionic Liquid-Catalyzed C–S Bond Construction using CO<sub>2</sub> as a C1 Building Block under Mild Conditions: A Metal-Free Route to Synthesis of Benzothiazoles
作者:Xiang Gao、Bo Yu、Zhenzhen Yang、Yanfei Zhao、Hongye Zhang、Leiduan Hao、Buxing Han、Zhimin Liu
DOI:10.1021/acscatal.5b01874
日期:2015.11.6
The construction of the C–S bond using CO2 as a C1 feedstock can be considered as a green route for the synthesis of S-containing compounds and is of great significance. Herein, we report the acetate-based ionic liquids (ILs)-catalyzed synthesis of benzothiazoles via cyclization of 2-aminothiophenols with CO2 and hydrosilane under mild conditions (e.g., 60 °C, 0.5 MPa). It was found that the IL (e
使用CO 2作为C1原料构建C–S键可以被认为是合成含S化合物的绿色途径,并且具有重要意义。本文中,我们报告了在温和的条件下(例如60°C,0.5 MPa),通过2-氨基硫酚与CO 2和氢硅烷的环化反应,乙酸盐基离子液体(ILs)催化的苯并噻唑的合成。发现IL(例如,乙酸1-丁基-3-甲基咪唑鎓盐,[Bmim] [OAc])用作具有活化CO 2的多功能催化剂。与氢硅烷形成甲醛硅烷中间体,同时通过氢键活化2-氨基硫酚,最终导致生成苯并噻唑。[Bmim] [OAc]表现出最好的性能,并以高收率获得了一系列苯并噻唑。据我们所知,这是在无金属且温和的条件下使用CO 2作为C1结构单元合成苯并噻唑的第一个方案。