RuHCl(diphosphine)(diamine): Catalyst Precursors for the Stereoselective Hydrogenation of Ketones and Imines1
摘要:
New chiral complexes RuHCl(diphosphine)-(diamine) are readily prepared from RuHCl(PPh3)(3). The diamine complexes, in the presence of alkoxide base, catalyze the hydrogenation of a wide variety of ketones and imines at 3 atm H-2, 20 degreesC, including prochiral imines to chiral amines in good to excellent enantiomeric excess.
RuHCl(diphosphine)(diamine): Catalyst Precursors for the Stereoselective Hydrogenation of Ketones and Imines1
摘要:
New chiral complexes RuHCl(diphosphine)-(diamine) are readily prepared from RuHCl(PPh3)(3). The diamine complexes, in the presence of alkoxide base, catalyze the hydrogenation of a wide variety of ketones and imines at 3 atm H-2, 20 degreesC, including prochiral imines to chiral amines in good to excellent enantiomeric excess.
Asymmetric Hydrogenation of Ketones Catalyzed by Ruthenium Hydride Complexes of a Beta-aminophosphine Ligand Derived from Norephedrine
作者:Rongwei Guo、Alan J. Lough、Robert H. Morris、Datong Song
DOI:10.1021/om049460h
日期:2004.11.1
A series ruthenium complexes with the chiral P−N ligand (1R,2R)-PPh2CHPhCHMeNH2 derivedfrom (1S,2R)-norephedrine are synthesized starting from the complexes RuHCl(PPh3)3 or RuHCl(P−P)(PPh3) (P−P= (R)-binap or (S)-binap). These are precatalysts for the efficient asymmetrichydrogenation of simple ketones. For the hydrogenation of acetophenone to 1-phenylethanol, the enantioselectivity observed can