A Reusable Palladium Catalyst for Allylic Arylation of Baylis‐Hillman Adducts via Heck Arylation‐Isomerization Cascade Under Solvent‐Free Conditions

A facile and sustainable intermolecular Heck arylation/isomerization of Baylis–Hillman adducts with iodobenzene, leading toward the synthesis of α ‐benzyl‐ β ‐keto esters using a novel heterogeneous palladium catalyst under milder conditions, is demonstrated. This polymer‐supported palladium catalyst ( mPAN‐Pd ) was tailored by immobilizing PdCl 2 onto post‐functionalized polyacrylonitrile ( mPAN ). The key feature of this protocol involves simple catalyst preparation, rapid reactions with excellent conversion up to 96% yield under solvent/ligand‐free and open‐air conditions. Above all, the catalyst offered easy recyclability by simple filtration and exhibited excellent catalytic activity and stability up to five repeated reaction cycles.