Site- and Stereoselective C–H Alkylations of Carbohydrates Enabled by Cooperative Photoredox, Hydrogen Atom Transfer, and Organotin Catalysis
作者:Daniel J. Gorelik、Julia A. Turner、Tarunpreet S. Virk、Daniel A. Foucher、Mark S. Taylor
DOI:10.1021/acs.orglett.1c01718
日期:2021.7.2
carbohydrates with electron-deficientalkenes in the presence of an Ir(III) photoredox catalyst and quinuclidine, a hydrogen atom transfer mediator. Quantum-chemical calculations support a proposed mechanism involving the formation of a cyclic stannylene acetal intermediate that shows enhanced reactivity toward hydrogen atom abstraction by the quinuclidinium radical cation. Addition of the carbon-centered