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Synthesis
DOI: 10.1055/a-2742-1904
DOI: 10.1055/a-2742-1904
Short Review
Metal-Free Reagents and Catalysts for C–C Multiple Bond Reduction
Autoren
The authors are grateful for funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC 2033 – 390677874 – RESOLV, the state of NRW (Center of Solvation Science “ZEMOS”), the Fonds der Chemischen Industrie (FCI, Liebig Fellowship for MPW), and Umicore (donation of precious metals) for funding.
Abstract
Organic reductants are increasingly important for the reduction of C–C multiple bonds, as they avoid scarce platinum-group metals and broadly tolerate Lewis-basic motifs common in medicinal chemistry. Diverse reduction mechanism via hydride transfer, protonation, hydroboration, frustrated Lewis pair-mediated H₂ activation, diimide-mediated hydrogen transfer, and photoinduced electron, energy, or hydrogen atom transfer provide distinct and often complementary reactivity orders enabling predictable reductions even in complex molecules. This review discusses the main mechanisms and categorizes them based on the reducible substrate classes and the tolerance of Lewis-basic motifs, highlighting methods with particular relevance to medicinal chemistry applications.
Keywords
Organocatalysis - Reduction - Organic hydride - Ionic reduction - Hydroboration - FLP - Diimide - PhotocatalysisPublikationsverlauf
Eingereicht: 19. September 2025
Angenommen nach Revision: 27. Oktober 2025
Artikel online veröffentlicht:
26. November 2025
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