The asymmetric conjugate addition of diethyl zinc to acyclic enones is described. With 1% Cu(OTf)2 and 2% of a chiral phosphite ligand, the catalyst allowed ee's up to 92'% to be obtained. The addition of dimethyl zinc to a macrocyclic 15-membered ring enone lead to optically active R-(-)-muscone, in 53% yield and 79% enantiomeric excess.
描述了
二乙基锌与无环烯酮的不对称共轭加成。使用 1% 的 Cu(OTf)2 和 2% 的手性
亚磷酸酯
配体,该催化剂允许获得高达 92% 的 ee。将二甲基
锌添加到大环 15 元环烯酮中会产生光学活性的 R-(-)-
麝香酮,产率 53%,对映体过量 79%。