A catalyst system consisting of RuCl2[(S)-tolbinap][(R)-dmapen] and t-C4H9OK in 2-propanol effects asymmetric hydrogenation of arylglyoxal dialkylacetals to give the alpha-hydroxy acetals in up to 98% ee. Hydrogenation of racemic alpha-amidopropiophenones under dynamic kinetic resolution predominantly gives the syn alcohols in up to 99% ee and > 98% de, while the reaction of racemic bezoin methyl ether gives the anti alcohols in excellent stereoselectivity.
Polymer-Immobilized Catalyst for Asymmetric Hydrogenation of Racemic α-(<i>N</i>-Benzoyl-<i>N</i>-methylamino)propiophenone
Asymmetric hydrogenation of alpha-(N-benzoyl-N-methylamino)propiophenone through dynamic kinetic resolution was performed by using a polymer-immobilized chiral diamine-ruthenium-BINAP-t-BuOK system in order to yield syn-beta-amide alcohol exclusively with nearly perfect enantioselectivity.