[EN] PREPARATION METHOD FOR AND APPLICATION OF 3-SUBSTITUTED CHIRAL SPIRO AMINOPHOSPHINE LIGAND ON PYRIDINE RING<br/>[FR] PROCÉDÉ DE PRÉPARATION ET APPLICATION D'UN LIGAND SPIRO AMINOPHOSPHINE CHIRAL SUBSTITUÉ EN POSITION 3 SUR UN CYCLE PYRIDINE<br/>[ZH] 吡啶环上3-位取代手性螺环胺基膦配体制备方法及其应用
practical method for efficient asymmetric hydrogenation of β-aryl alkylidene malonates. With a site-specifically tailored chiral spiro iridium catalyst, a series of β-aryl alkylidene malonate esters were hydrogenated to afford chiral malonate esters with good to excellent enantioselectivities (up to 99% ee) and high turnover numbers (up to 19000). The results showed that installing an ester group in α,β-unsaturated