A metal-free and recyclable synthesis of benzothiazoles using thiourea as a sulfur surrogate
作者:Yan Yin、Hong Zhou、Xichen Liu、Haiying Chen、Fanhong Wu、Heng Zhang、Ruiheng Tao、Fengkai Cheng、Yangbo Feng
DOI:10.1016/j.tetlet.2015.02.054
日期:2015.3
Using odorless thiourea as the S source, benzothiazoles and asymmetric disulfides could be obtained from thioformanilides through the tandem cyclization/nucleophilic addition/hydrolysis/nucleophilic substitution reaction. Furthermore, the obtained asymmetric disulfides could readily transfer to benzothiazoles after nitro-reduction and amide formation reaction. This metal-free and recyclable synthetic methodology offered a time-efficient, less expensive, and environmentally friendly alternative to multifunctional benzothiazoles. (C) 2015 Elsevier Ltd. All rights reserved.