Enantioselective epoxidation of α,β-unsaturated ketones using polymer-supported lanthanoid–BINOL complexes

Abstract

The immobilization of chiral lanthanum and/or ytterbium complexes using polymer-support is described. The heterogeneous catalysts obtained promote the enantioselective epoxidation of α,β-unsaturated ketones affording the products in good yields with high enantiomeric excess. The catalysts were easily separated from the products by washing with ether and the recovered catalysts promote the enantioselective epoxidation reaction effectively maintaining the high level of enantioselectivity obtained during the first run.