Enantioselective glyoxylate-ene reaction using a novel spiro bis(isoxazoline) ligand in copper catalysis

Novel chiral spiro bis(isoxazoline) ligands 3 and 4 are synthesized from an optically active olefin. The Cu(II)-spiro bis(isoxazoline) complex prepared in situ from Cu(OTf)(2) and 3 promoted the glyoxylate-ene reaction in high yield and moderate enantioselectivity (up to 70%). (c) 2007 Published by Elsevier Ltd.