Assembly of indoline-2-carboxylate-embodied dipeptides via Pd-catalyzed C(sp2)-H bond direct functionalization.

Intramolecular dehydrogenative cyclization of 2-methoxyiminoacyl-protected phenylalanine derivatives proceeded at 110 °C under catalysis of Pd(OAc)2 in the presence of 1-fluoro-2,4,6-trimethylpyridinium tetrafluoroborate to afford substituted indoline-2-carboxylates that were converted into indoline-2-carboxylate-embodied dipeptides via Raney Ni-catalyzed hydrogenation.