An efficientsynthesis of chiral quaternary carbon centres via Me2Cu(CN)Li2·BF3 or RCu(CN)Li·BF3(R ≠ Me) mediated 1,3-chirality transfer of α-alkyl-γ-mesyloxy-α,β-enoates is reported.
Organocyanocopper-trifluoroborane mediated 1,3-chirality transfer reaction of .gamma.-(mesyloxy)-.alpha.-alkyl .alpha.,.beta.-enoates for the construction of chiral quaternary carbon centers with high optical purity