The ratio of methyl transfer (2) and reduction (3) products in the reaction of trimethoxycarbonylethylene 1 with methylcopper reagents MeCuLn varies with the copper species, and decreased in the following order: MeCu(CN)Li > MeCu > Me2Cu(CN)Li2≫ Me2CuLi > Me3CuLi2.
三甲基氧基
乙炔1与甲基
铜试剂MeCuLn反应时,甲基转移产物(2)和还原产物(3)的比例随
铜的种类而变化,且按以下顺序递减:MeCu(CN)Li>MeCu>Me2Cu(CN)Li2>Me2CuLi>Me3CuLi2。