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A family of complexes of the formula trans -[RuCl 2 (L)(R-pybox)] (R-pybox = ( S , S )-  i  Pr-pybox, ( R , R )-Ph-pybox, L = monodentate phosphonite, PPh(OR) 2 , and phosphinite, L = PPh 2 (OR), ligands) were screened in the catalytic asymmetric transfer hydrogenation of acetophenone, observing a strong influence of the nature of both the R-pybox substituents and the L ligand in the process. The best results were obtained with complex trans -[RuCl 2 {PPh 2 (OEt)}{( R , R )-Ph-pybox}] ( 2c ), which provided high conversion and enantioselectivity (up to 96% enantiomeric excess, e.e. ) for the reduction of a variety of aromatic ketones, affording the ( S )-benzylalcohols.

molecules/molecules online/molecules annual

Asymmetric Transfer Hydrogenation of Arylketones Catalyzed by Enantiopure Ruthenium(II)/Pybox Complexes Containing Achiral Phosphonite and Phosphinite Ligands