Abstract
The copper-catalysed asymmetric conjugate addition of diphenylzinc to 2-cyclohexenone has been carried out with good results. An enantiometric excess of up to 91% was obtained using 5 mol% CuI and 5 mol% phosphine ligand derived from L-proline.
Keywords: copper-catalyzed, conjugate-addition, diphenylzinc, phosphine, ligand