Wang Hao, Wu Qi, Zhang Jian-Dong, Li Hai-Yan, Li Hong-Xi
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Analysis and Testing Center, Soochow University, Suzhou 215123, China.
Org Lett. 2021 Mar 19;23(6):2078-2083. doi: 10.1021/acs.orglett.1c00235. Epub 2021 Feb 26.
A photocatalyst- and transition-metal-free visible-light-induced cyclization of -halothiobenzanilides has been developed. Upon irradiation with visible light, substrates undergo dehalogenative cyclization to 2-aryl benzothiazoles with high efficiency and selectivity. This photocyclization exhibits a high tolerance to various functional groups, is applicable for the synthesis of 2-alkyl benzothiazoles, and is easy to set up for gram-scale reaction.