Metal‐Free Cascade Oxidative Decarbonylative Alkylarylation of Acrylamides with Aliphatic Aldehydes: A Convenient Approach to Oxindoles via Dual C(sp2)—H Bond Functionalization.

A convenient metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphatic aldehydes to provide quaternary oxindoles is developed. With DTBP as an oxidant and radical-initiator, this reaction efficiently converts cheap and abundant aliphatic aldehydes into valuable alkyl radicals for the cascade construction of C(sp3)–C(sp3) and C(sp3)–C(sp2) bonds via dual C(sp2)–H bond functionalization.