Asymmetric Hydrogenation of β -Keto Esters Catalyzed by Ruthenium Species Supported on Porous Organic Polymer

A porous organic polymer (POP) with chiral 2, 2'-bis(diphenylphosphino)-1, 1'-binaphthalene (BINAP) has been prepared and characterized by several techniques including 13 C CP/MAS NMR, 31 P CP/MAS NMR, fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption. The material exhibits amorphous microporous structure. After loading of ruthenium(Ⅱ) species via coordination, the composite material Ru/POP-BINAP could be used as a heterogeneous catalyst for the asymmetric hydrogenation of β -keto esters with high activity, excellent enantioselectivity and recyclability.