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Novel chiral PN_4-type multidentate aminophosphine ligands have been successfully synthesized by Schiff-base condensation of bis(o-formylphenyl)phenylphosphane and various chiral amino-sulfonamides.Their structures were fully characterized by IR,EI-MS and NMR.The catalytic systems,prepared in situ from the multidentate ligands and iridium(I) complexes,showed high activity in asymmetric transfer hydrogenation of propiophenone in 2-propanol solution,leading to corresponding optical alcohol with up to 75%ee.
Novel chiral PN_4-type multidentate aminophosphine ligands have been synthesized synthesized by Schiff-base condensation of bis (o-formylphenyl) phenylphosphane and various chiral amino-sulfonamides. Their structures were fully characterized by IR, EI-MS and NMR. The catalytic systems, prepared in situ from the multidentate ligands and iridium (I) complexes, showed high activity in asymmetric transfer hydrogenation of propiophenone in 2-propanol solution, leading to corresponding optical alcohol with up to 75% ee.