Palladium‐Catalyzed Electrophilic Allylation Reactions via Bis(allyl)palladium Complexes and Related Intermediates

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Abstract
The synthetic scope of the allyl–palladium chemistry can be extended to involve electrophilic reagents. The greatest challange in these reactions is the catalytic generation of an allyl–palladium intermediate incorporating a nucleophilic allyl moiety. A vast majority of the published reactions that involve palladium‐catalyzed allylation of electrophiles proceed via bis(allyl)palladium intermediates. The η1‐moiety of the bis(allyl)palladium intermediates reacts with electrophiles, including aldehydes, imines, or Michael acceptors. Recently, catalytic electrophilic allylations via mono‐allylpalladium complexes were also presented by employment of so‐called “pincer complex” catalysts.