Abstract

Well-defined Ru amido complexes effected asymmetric Michael addition of β-keto esters to 2-cyclopenten-1-one to give quantitatively the corresponding Michael adducts with excellent ee although with a 1:1 diastereomer ratio. The stereochemical outcome of the reaction was significantly influenced by the structures of the catalysts and the structures of the β-keto esters; the ee value reaching up to 97%.

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