Copper-catalyzed tandem reactions of 2-halobenzenamines with isothiocyanates under ligand- and base-free conditions
作者:Yan-Jin Guo、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1016/j.tetlet.2009.11.086
日期:2010.1
ligand-free copper-catalyzed reaction of 2-halobenzenamines with isothiocyanates has been developed for the synthesis of 2-aminobenzothiazoles. In the presence of CuBr and TBAB (tetra-n-butyl ammonium bromide, additive), a variety of 2-halobenzenamines underwent the reaction with isothiocyanates at 40 °C, affording 2-aminobenzothiazoles in moderate to excellent yields. It is noteworthy that the reaction is
已经开发了无卤的2-卤代苯胺与异硫氰酸酯的铜催化反应,用于合成2-氨基苯并噻唑。在CuBr和TBAB(四正丁基溴化铵,添加剂)的存在下,各种2-卤代苯甲胺在40°C下与异硫氰酸酯反应,以中等至极好的收率得到2-氨基苯并噻唑。值得注意的是,该反应在温和的,相对较低的催化剂载量以及无配体和无碱的条件下进行。