Abstract

New practical conditions of asymmetric hydrogenation of β-keto esters with chiral Ru(II) catalysts are described. It is now possible to carry out the reaction at atmospheric pressure. Under these conditions, β-keto esters are hydrogenated to β-hydroxy esters with excellent enantiomeric excesses (up to 99%) using chiral ruthenium (II) catalysts easily prepared in situ by treatment of commercially available (COD)Ru(2-methylallyl) 2 in the presence of the appropriate chiral ligands such as Binap, MeO-Biphep and Me-Duphos.

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