Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2021, Issue 38, Pages 5367-5381Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202100894
Keywords
Asymmetric Transfer Hydrogenation; Catalysis; Chiral Phosphoric Acids; Metal-Free Hydrogenation; Organocatalysis
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Funding
- Austrian Science Fund FWF [P 29146] Funding Source: Medline
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Chiral phosphoric acid catalysts show high activity and enantioselectivity in organocatalytic asymmetric transfer hydrogenation, with promising development prospects. These catalysts are widely used in asymmetric reduction reactions of various compounds, and are increasingly applied in multicomponent/cascade reactions, demonstrating significant synthetic potential.
Herein, recent developments in the field of organocatalytic asymmetric transfer hydrogenation (ATH) of C=N, C=O and C=C double bonds using chiral phosphoric acid catalysis are reviewed. This still rapidly growing area of asymmetric catalysis relies on metal-free catalysts in combination with biomimetic hydrogen sources. Chiral phosphoric acids have proven to be extremely versatile tools in this area, providing highly active and enantioselective alternatives for the asymmetric reduction of alpha,beta-unsaturated carbonyl compounds, imines and various heterocycles. Eventually, such transformations are more and more often used in multicomponent/cascade reactions, which undoubtedly shows their great synthetic potential and the bright future of organocatalytic asymmetric transfer hydrogenations.
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