Cobalt/Salox‐catalyzed Stereoselective C‐H Functionalization: Enantioselective Construction of Axially Chiral Cyclic Phosphinamides with P‐Stereogenic Center

We describe a novel cobalt/salicyloxazoline (Salox) catalytic system for enantioselective C‐H functionalization, enabling the synthesis of P‐stereogenic and axially chiral cyclic phosphinic amides. Chiral Salox ligands, conveniently prepared in a single step from salicylonitriles and chiral amino alcohols, facilitated this transformation with excellent enantioselectivities (92‐99% ee) and moderate to good yields (31 examples, 45‐89%). Mechanistic studies implicate a cobalt (III/IV/II) catalytic cycle in the C‐H annulation process, providing valuable insights into the stereoselective reaction pathway.