Radical‐Mediated γ‐Functionalizations of α,β‐Unsaturated Carboxylic Amides

Highly successful tin‐free, radical‐mediated alkylations of α,β‐unsaturated carboxylic amides have been carried out. Alkyl iodides and bromides bearing α‐electron‐withdrawing groups undergo selective γ‐additions to diene O , N ‐acetals (see scheme). This approach to γ‐functionalization was further extended to the use of hetero groups, such as phenylsulfanyl and phenylsulfonyl species.