cuprates R2Cu(CN)Li2 react rapidly and in high yields with β-substituted enoates. α,β-Disubstituted systems afford moderate yields of product in certain cases whereas β,β-disubstituted unsaturated esters lead to 1,2-followed by 1,4-addition.
较高阶的混合
铜酸盐R 2 Cu(CN)Li 2与β-取代的烯酸酯快速反应且产率高。在某些情况下,α,β-二取代的体系可提供中等收率的产品,而β,β-二取代的不饱和酯可导致1,2-继之以1,4-加成。