Abstract
AbstractThe ruthenium diacetate complexes ligated by chiral spirobifluorene diphosphines (SFDP) were very effective catalysts for the asymmetric hydrogenation of tiglic acid derivatives and α‐methylcinnamic acid derivatives with high activities and excellent enantioselectivities (up to 98 % ee). The α‐aryloxybutenoic acids can also be hydrogenated by these catalysts to provide the corresponding saturated α‐aryloxybutanoic acids in high yields (89–93 %) and enantioselectivities (up to 95 % ee). In this reaction, the SFDP ligand with para‐methyl groups on the P‐phenyl rings gave the best results.
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