Journal
CHIMIA
Volume 70, Issue 3, Pages 186-191Publisher
SWISS CHEMICAL SOC
DOI: 10.2533/chimia.2016.186
Keywords
Asymmetric catalysis; Electron transfer; Electron transfer catalysis; Photoredox catalysis; Visible light
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Chemical processes combining visible-light-activated redox catalysis with asymmetric catalysis are reviewed, including enamine catalysis in the presence or absence of an additional photoredox sensitizer, phase transfer catalysis exploiting an in situ-generated electron donor acceptor complex, photosensitized chiral Lewis acid catalysis, and photoactivated nickel-catalyzed asymmetric cross-couplings. The transfer of a single electron leads to intermediate radical ions, whose strongly modulated reactivities can be exploited for asymmetric catalysis in a novel fashion. All processes discussed here are redox neutral so that the electron serves as a real catalyst which cooperates with an asymmetric catalyst for the overall asymmetric transformation.
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