Visible-Light-Driven Radical Multicomponent Reaction of 2-Vinylanilines, Sulfonyl Chlorides, and Sulfur Ylides for Synthesis of Indolines
作者:Mukund M. D. Pramanik、Fan Yuan、Dong-Mei Yan、Wen-Jing Xiao、Jia-Rong Chen
DOI:10.1021/acs.orglett.0c00602
日期:2020.4.3
A visible-light-driven photoredox-catalyzed multicomponent reaction of 2-vinylanilines, sulfonyl chlorides, and sulfur ylides is described. This protocol features redox-neutral mild conditions, a broad substrate scope, and good functional group tolerance, providing access to various sulfonated 2,3-disubstituted indolines. The product can be transformed to a diverse range of functionalized indoles by
organosulfur compounds, limited examples of transition-metal-catalyzed thiol-ene reactions have been reported. However, in this work, a directing-group-assisted hydrothiolation of styrenes with thiols by photoredox/cobalt catalysis is found to proceed smoothly to afford Markovnikov-type sulfides with excellent regioselectivity.
Inverse-electron-demand [4+2] cycloaddition of photogenerated aza-<i>ortho</i>-quinone methides with 1,3,5-triazinanes: access to perfluoroalkylated tetrahydroquinazolines
Electrochemically catalyzed amino-oxygenation of styrenes: n-Bu<sub>4</sub>NI induced C–N followed by a C–O bond formation cascade for the synthesis of indolines
作者:Sen Liang、Cheng-Chu Zeng、Xu-Gang Luo、Fa-zheng Ren、Hong-Yu Tian、Bao-Guo Sun、R. Daniel Little
DOI:10.1039/c5gc02626a
日期:——
An efficient indirect electrochemical amino-oxygenation of styrenes has been developed for the synthesis of 3-alkoxyindolines.
A neutral nitrogen radical-mediation strategy, wherein the existing N-H moiety of substrates serves as a neutral nitrogen radical precursor to enable room-temperature intermolecular radical difunctionalization of styrenes under photoredox catalysis, is reported. The reaction shows high functional group tolerance and substrate scope with respect to both components, giving the corresponding products with generally good yields. Preliminary control experiments and DFT calculations are performed to explain the reaction mechanism.