Ru(III)-catalyzed oxidative reaction in ionic liquid: an efficient and practical route to 2-substituted benzothiazoles and their hybrids with pyrimidine nucleoside
作者:Xuesen Fan、Yangyang Wang、Yan He、Xinying Zhang、Jianji Wang
DOI:10.1016/j.tetlet.2010.04.050
日期:2010.7
environmentally benign synthesis of 2-substituted benzothiazoles was developed through RuCl3-catalyzed oxidative condensation of 2-aminothiophenol with aldehyde in ionic liquid by using air as the oxidant. With this procedure, a series of 2-substituted benzothiazoles and benzothiazole/pyrimidine nucleoside hybrids with antimicrobial activities were efficiently prepared from easily accessible starting materials
An aerobic visible-light driven photoredox catalytic formation of 2-substitutedbenzothiazoles through radical cyclization of thioanilides has been accomplished. The reaction features C–H functionalization and C–S bond formation with no direct metal involvement except the sensitizer. The reaction highlights the following: (1) visible-light is the reaction driving force; (2) molecular oxygen is the
Elemental sulfur as a polyvalent reagent in redox condensation with o-chloronitrobenzenes and benzaldehydes: three-component access to 2-arylbenzothiazoles
作者:Le Anh Nguyen、Quoc Anh Ngo、Pascal Retailleau、Thanh Binh Nguyen
DOI:10.1039/c7gc01825h
日期:——
Sulfur was found to be a polyvalent reagent in the multicomponent redox condensation with o-chloronitrobenzenes and benzaldehydes. 2-Arylbenzothiazoles was obtained in moderate to good yields in a highly atom-economical pathway.
Riboflavin as Photoredox Catalyst in the Cyclization of Thiobenzanilides: Synthesis of 2-Substituted Benzothiazoles
作者:Lydia M. Bouchet、Adrián A. Heredia、Juan E. Argüello、Luciana C. Schmidt
DOI:10.1021/acs.orglett.9b04384
日期:2020.1.17
Benzothiazoles are synthesized from thiobenzanilides using riboflavin as a photosensitizer and potassium peroxydisulfate as a sacrificial oxidizing agent under visible light irradiation. The methodology accepts a broad range of functional groups and affords the 2-substitutedbenzothiazoles by transition-metal-free organic photoredoxcatalysis under very mild conditions.
Metal- and base-free, aerobic photoredox catalysis with riboflavin to synthesize 2-substituted benzothiazoles
作者:Adrián A. Heredia、Juan E. Argüello、Luciana C. Schmidt
DOI:10.1039/d3ob01851b
日期:——
Sustainable approaches for the synthesis of 2-substitutedbenzothiazoles are sought after for their use in organic chemistry, bioorganic chemistry, and industrial applications. Here, we described a visiblelight-drivenphotoredox catalytic cyclization of thioanilides to afford 2-substitutedbenzothiazoles using riboflavin as a photocatalyst, where oxygen is used as a clean oxidant and ethanol as a