A Synergistic LUMO Lowering Strategy Using Lewis Acid Catalysis in Water to Enable Photoredox Catalytic, Functionalizing C-C Cross-Coupling of Styrenes

26 April 2018, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Easy available alpha-carbonyl acetates serve as convenient alkyl radical source for an efficient, photocatalytic crosscoupling with a great variety of styrenes. Activation of electronically different alpha-acetylated acetophenone derivatives could be effected via LUMO lowering catalysis using a superior, synergistic combination of water and (water-compatible) Lewis acids. Deliberate application of fac-Ir(ppy)3 as photocatalyst to enforce an oxidative quenching cycle is crucial to the success of this (umpolung type) transformation. Mechanistic particulars of this dual catalytic coupling reaction have been studied in detail using both Stern-Volmer and cyclic voltammetry experiments. As demonstrated in more than 30 examples, our waterassisted
LA/photoredox catalytic activation strategy allows for excess-free, equimolar radical cross-coupling and subsequent formal Markovnikov hydroxylation to versatile 1,4-difunctionalized products in good to excellent yields.

Keywords

photoredox catalysis
Lewis Acid
Radical Cross Coupling
LUMO Lowering
Visible Light

Supplementary materials

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Description
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Title
ZeitlerSuppInfoSynergisticLAPhotoredoxFunctionalizingCrossCoupling ChemRxiv
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