Asymmetric 1,4-addition of arylboronic acids to α,β-unsaturated aldehydes catalyzed by a chiral diene-rhodium complex

Asymmetric 1,4-addition of arylboronic acids to alpha,beta-unsaturated aldehydes proceeded in the presence of a rhodium catalyst (3 mol %) coordinated with a chiral diene ligand ((R,R)-Bn-bod*) to give the corresponding beta-arylaldehydes with perfect 1,4-selectivity and with 88-97% enantioselectivity.