Palladium‐Catalyzed Aerobic Oxidative Double Allylic C—H Oxygenation of Alkenes: A Novel and Straightforward Route to α,β‐Unsaturated Esters.

A mild tandem oxidative functionalization of allyl aromatic hydrocarbons was accomplished using the catalytic system of Pd(OAc)2/DMA under 1 atm O2. The green twofold C–O bond formation involving double allylic C–H oxygenation unlocks opportunities for markedly different synthetic strategies. Moreover, the reaction affords aryl α,β-unsaturated esters directly from readily available terminal olefins in moderate to good yields with excellent chemo- and stereoselectivities.