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
Use of Molecular Oxygen as a Reoxidant in the Synthesis of 2-Substituted Benzothiazoles via Palladium-Catalyzed CH Functionalization/Intramolecular CS Bond Formation
作者:Kiyofumi Inamoto、Chisa Hasegawa、Junpei Kawasaki、Kou Hiroya、Takayuki Doi
DOI:10.1002/adsc.201000604
日期:2010.10.4
Molecularoxygen (O2) was successfully employed as a reoxidant in cyclizations of thiobenzanilides 1a–s through a palladium-catalyzed CH functionalization/intramolecular CS bondformation process, leading to an efficient, green method for the synthesis of 2-arylbenzothiazoles 2a–s. Addition of cesium fluoride (CsF) greatly enhanced the reactions, which produced variously substituted 2-arylbenzothiazoles
Desulfurization of thioamides was accomplished using a semicatalytic amount of Bu4NBr. The corresponding amides were obtained in high yields, with good functional group compatibility.
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
The Role of Base in Reaction Performance of Photochemical Synthesis of Thiazoles: An Integrated Theoretical and Experimental Study
作者:Jiaxin Xu、Xiaoyu Ye、Zongchao Lv、Yi‐Hung Chen、Xiang Simon Wang
DOI:10.1002/chem.202304279
日期:2024.5.8
testing. Feature analysis is conducted through the model interpretation process, enabling further exploration into the reaction mechanisms. We then chose two substrates of distinct structures and verified the predictions through experimental benchwork. This represents a novel reaction with different bases.