Photoinduced Electron Transfer from Xanthates to Acyl Azoliums: Divergent Ketone Synthesis via <i>N</i>‐Heterocyclic Carbene Catalysis
作者:Chang‐Yin Tan、Minseok Kim、Sungwoo Hong
DOI:10.1002/anie.202306191
日期:2023.8.7
A versatile NHC-catalyzed method has been developed for synthesizing ketones from alcohols and carboxylic acid derivatives through SET (single electrontransfer) between photoexcited xanthates and acyl azoliums. This approach further facilitates the generation of structurally diverse cross-coupled ketones by incorporating alkenes and enynes.
photocatalytic metal-free cross-coupling of benzylic and aldehydic C–H bonds by synergistic catalysis of organophotocatalyst 4CzIPN and a thiol, which affords the corresponding α-aryl ketones in acceptable yields along with hydrogen evolution. The mechanistic investigation indicates a radical–radical coupling to give an intermediary alcohol, followed by an acceptorless alcohol dehydrogenation.