Metal-Free Synthesis of 2-Aminobenzothiazoles via Aerobic Oxidative Cyclization/Dehydrogenation of Cyclohexanones and Thioureas
Jinwu Zhao, Huawen Huang, Wanqing Wu, Huoji Chen and Huanfeng Jiang*
*School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China, Email: jianghfscut.edu.cn
J. Zhao, H. Huang, W. Wu, H. Chen, H. Jiang, Org. Lett., 2013, 15, 2604-2607.
A catalytic amount of iodine enables a metal-free synthesis of 2-aminobenzothiazoles from cyclohexanones and thioureas in the presence of molecular oxygen as the oxidant under mild conditions. Various 2-aminobenzothiazoles, 2-aminonaphtho[2,1-d]thiazoles, and 2-aminonaphtho[1,2-d]thiazoles were prepared in satisfactory yields.
see article for more examples
benzothiazoles, oxygen, iodine