Double C–S bond formation via C–H bond functionalization: synthesis of benzothiazoles and naphtho[2,1-d]thiazoles from N-substituted arylamines and elemental sulfur
作者:Xiaoming Zhu、Yuzhong Yang、Genhua Xiao、Jianxin Song、Yun Liang、Guobo Deng
DOI:10.1039/c7cc07366f
日期:——
A novel, atom economic, and environmentally friendly method for the synthesis of 2-substituted benzothiazoles and 2-substituted naphtho[2,1-d]yhiazoles from N-substituted arylamines and elemental sulfur has been developed under metal-free conditions. The reaction underwent the process of double C-Sbonds formation through C-H bonds functionalization.
Assembly of 2-Arylbenzothiazoles through Three-Component Oxidative Annulation under Transition-Metal-Free Conditions
作者:Xingzong Che、Jingjing Jiang、Fuhong Xiao、Huawen Huang、Guo-Jun Deng
DOI:10.1021/acs.orglett.7b02168
日期:2017.9.1
Highly efficient methods for the synthesis of 2-arylbenzothiazoles and 2-arylnaphtho[2,1-d]thiazoles have been developed. Readily available aromatic amines, benzaldehydes, and elemental sulfur were directly assembled through oxidative annulation and C-H functionalization under transition-metal-free conditions, where DMSO or oxygen served as the oxidant. NH4I or KI as the catalyst was found to be effective to promote the transformations to give the annulation products in good to excellent yields with wide functional group tolerance.