Copper‐Catalyzed Aerobic Oxidation of Amines to Benzothiazoles via Cross Coupling of Amines and Arene Thiolation Sequence
作者:Jihyeon Kim、Kyungsoo Oh
DOI:10.1002/adsc.202000598
日期:2020.9.8
A one‐pot three‐component synthesis of benzothiazoles has been developed using the copper‐catalyzed aerobic cross coupling of amines followed by arene thiolation using elemental sulfur. The dual roles of elemental sulfur and CuCl(OH)‐TMEDA in the aerobic amine oxidation and the aniline thiolation enable the facile access to benzothiazole derivativesfrom readily available starting materials. The operational
The graphene oxide-catalyzed coupling and cyclization reactions of primary amines with elemental sulfur was developed to afford various optically property benzothiazoles. This coupling and cyclization strategies proceeded under the oxidant system graphene oxide/O2 and constructed carbon-heteroatom (N, S) bonds with amines and elemental sulfur. Due to benzothiazoles as common chromophores, these products
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.