Visible light-induced selective generation of radicals from organoborates by photoredox catalysis

Abstract

A new strategy for the generation of carbon-centered radicals via oxidation of alkyl-, allyl-, benzyl- and arylborates by visible-light-driven single electron transfer (SET) photoredox catalysis has been established. The generated radicals smoothly react with TEMPO and electron-deficient alkenes to afford C-O and C-C coupling products, respectively. In this radical initiating system, cyclic organo(triol)borates turn out to be useful radical precursors. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.