Heterogeneous Jørgensen–Hayashi catalyst for asymmetric Michael addition of malonates to α,β-enals. Cooperative effect with Ca(OTf)2

Abstract

Heterogeneous chiral Jorgensen–Hayashi catalyst promotes enantioselective Michael addition of malonates at cinnamic aldehydes. In combination with Ca(OTf)2, it provides high yields (up to 78%) and excellent enantiomeric excesses (up to 99%) of the adducts.