Tris(pentafluorophenyl)borane‐Catalyzed Oxygen Insertion Reaction of α‐Diazoesters (α‐Diazoamides) with Dimethyl Sulfoxide

Abstract A tris(pentafluorophenyl)borane‐catalyzed oxidation reaction of α‐diazoesters (α‐diazo amides) with dimethyl sulfoxide has been developed. The reaction proceeds under metal free conditions to afford a series α‐ketoesters and α‐ketoamides. The synthetic utility of this protocol is demonstrated through synthetic transformations and scaled‐up synthesis. magnified image