Counterion-Enhanced Pd/Enamine Catalysis: Direct Asymmetric α-Allylation of Aldehydes with Allylic Alcohols by Chiral Amines and Achiral or Racemic Phosphoric Acids
catalytic procedure for the direct asymmetric α-allylation of branched aldehydes. The use of simple chiralamines and easily prepared achiral or racemic phosphoric acids, together with a suitable Pd-source resulted in a highly active and enantioselectivecatalyst system for the allylation of various α-branched aldehydes with different allylic alcohols. The reported procedure could provide an easy access to