A highlyenantioselective 1,4-addition of aryltrialkoxysilanes to α,β-unsaturated esters and amides was successfully catalyzed by a chiral rhodiumcomplex generated from [Rh(cod)(MeCN)2]BF4 and (S)-BINAP.
This paper describes an efficient enantioselectiveconjugateaddition of highly stable potassium trifluoro(organo)borates to α,β-unsaturated amides. This reaction, catalyzed by chiral rhodium(I) complexes affords Michael adducts with high yields and enantiomeric excesses up to 95%.