Using the Thiyl Radical for Aliphatic Hydrogen‐Atom Transfer: Thiolation of Unactivated C−H Bonds
作者:Liubov I. Panferova、Mikhail O. Zubkov、Vladimir A. Kokorekin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1002/anie.202011400
日期:2021.2.8
A metal‐ and catalyst‐free thiyl‐radical‐mediated activation of alkanes is described. Tetrafluoropyridinyl disulfide is used to perform thiolation of the C−H bonds under irradiation with 400 nm light‐emitting diodes. The key C−H activation step is believed to proceed via hydrogen‐atom abstraction effected by the fluorinated thiylradical. Secondary, tertiary, and heteroatom‐substituted C−H bonds can
Tetrafluoropyridinyl Thiolate as a Tool for Enabling Photoredox Alkylation of 1,2,4‐Oxadiazoles
作者:Alexander E. Frumkin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1002/adsc.202400075
日期:——
4‐oxadiazoles using alkylhalides as precursors of radicals is described. The reaction efficiency is determined by potassium tetrafluoropyridinyl thiolate additive, which plays dual role. First, the thiolate converts alkylhalides into more reactive fluorinated aryl sulfides, which undergo photoredox activation of the C‐S bond. Second, the thiolate decreases the unproductive loss of alkyl radicals by converting