C–H phosphorylation of thiazole derivatives with diarylphosphine oxides by a photoredox process in the absence of an external oxidant. The scope of thiazoles and phosphine oxides was further investigated, as was functional group tolerance. The general and operational simplicity provides a novel metal and oxidant-free alternative for the formation of heteroaryl-P bonds, and only molecular hydrogen is
An efficient and convenient copper-catalyzed oxidative chalcogenation of benzothiazoles and imidazo[1,2-a]pyridines with sulfur/selenium powder and aryl boronic acids was developed. This procedure allows access to a wide range of structurally diverse arylchalcogen-substituted benzothiazoles/imidazo[1,2-a]pyridines in good yields and with good functional group tolerance. A biological evaluation revealed
Formal Carbene C–H Bond Insertion in the Cu(I)-Catalyzed Reaction of Bis(trimethylsilyl)diazomethane with Benzoxazoles and Oxazoles
作者:Shuai Wang、Shuai Xu、Cheng Yang、Hanli Sun、Jianbo Wang
DOI:10.1021/acs.orglett.9b00391
日期:2019.3.15
A Cu(I)-catalyzed cross-coupling reaction of bis(trimethylsilyl)diazomethane and benzoxazoles/oxazoles is reported. A wide range of functional groups can be tolerated in this transformation. This reaction provides a new method to directly introduce a 1,1-bis(trimethylsilyl)methyl group into heteroaromatic C–H bonds. Subsequent transformations of 1,1-bis(trimethylsilyl)-methylated heteroaromatic compounds
Visible-light induced decarboxylative C2-alkylation of benzothiazoles with carboxylic acids under metal-free conditions
作者:Bin Wang、Pinhua Li、Tao Miao、Long Zou、Lei Wang
DOI:10.1039/c8ob02476f
日期:——
C2-alkylation of benzothiazoles with aliphatic carboxylic acids was disclosed. In the presence of an acridinium salt as a photocatalyst and air as an oxidant, a wide range of secondary or tertiary aliphatic carboxylic acids were employed as alkylation reagents, providing the desired products in good to excellent yields under mild reaction conditions with a broad substrate scope.
Predictive Model for Site-Selective Aryl and Heteroaryl C–H Functionalization via Organic Photoredox Catalysis
作者:Kaila A. Margrey、Joshua B. McManus、Simone Bonazzi、Frederic Zecri、David A. Nicewicz
DOI:10.1021/jacs.7b06715
日期:2017.8.16
Direct C–Hfunctionalization of aromatic compounds is a useful synthetic strategy that has garnered much attention because of its application to pharmaceuticals, agrochemicals, and late-stage functionalization reactions on complex molecules. On the basis of previous methods disclosed by our lab, we sought to develop a predictive model for site selectivity and extend this arylfunctionalization chemistry