Boration of an α,β-enone using a diboron promoted by a copper(I)–phosphine mixture catalyst

Abstract The Cu(I)-catalyzed boration of an α,β-enone using a diboron is described. Combination of a Cu(I) salt and tributylphosphine is an effective catalyst system, though the individual use of Cu(I) and tributylphosphine is not active for the reaction.