Rh(I)-new chiraldiphosphinite systems with terminal amino groups were very effective for asymmetrichydrogenation of dehydrodipeptides with free carboxyl group and a chiral carbon. The effectiveness of the diphosphinite catalysts strongly suggests the contribution of electrostatic effect to asymmetric induction.
dicyclohexylphosphinooxy and dimethylamino moieties (Cy-POP-AE) was effective for the asymmetrichydrogenation of N-(benzoylformyl) amino acids by a Rh(I) catalyst under mild conditions. A neutral rhodium(I) precursor enabled a double asymmetric induction in methanol, while a cationicprecursor caused an asymmetric induction controlled mainly by the substrate chirality.