An unprecedented aromaticsubstitutionreaction of benzylic ammonium salts has been developed through palladium-catalyzed C-N bond cleavage. A range of primary and secondary amines participated in a palladium-catalyzed aromaticsubstitutionreaction of benzylic ammonium salts, delivering sterically hindered aromaticamines in moderate to excellent yields with extremely high regioselectivity. Preliminary