A highly efficient ruthenium‐catalyzed asymmetric reductive amination (ARA) of racemic β‐keto lactams with molecular hydrogen and ammonium salts is disclosed for the synthesis of enantiomerically pure primary amino lactams through dynamickineticresolution (DKR). By this approach, a range of syn primary β‐amino lactams were obtained in high yields with high chemo‐, enantio‐, and diastereoselectivity