Asymmetric trifluoromethylation of aromatic aldehydes by cooperative catalysis with (IPr)CuF and quinidine-derived quaternary ammonium salt
作者:Shaoxiang Wu、Wei Zeng、Qi Wang、Fu-Xue Chen
DOI:10.1039/c2ob26827b
日期:——
A general enantioselective trifluoromethylation of aldehydes has been developed using (IPr)CuF and quinidine-derived quaternary ammonium salt as the cooperative catalyst. Thus, a wide range of aromatic aldehydes have been converted to the corresponding products in up to 92% yield and 81% ee at 2 mol% of catalyst loading. The greatly enhanced activity and enantioselectivity result from the initiative generation of active [(IPr)CuCF3] as well as additional coordination activation of other copper species.
已经开发了一种针对醛类的通用对映选择性三氟甲基化反应,使用(IPr)CuF和奎宁衍生的四价铵盐作为协同催化剂。因此,广泛的芳香醛被转化为相应的产物,产率高达92%,对映体过剩率(ee)为81%,催化剂用量为2摩尔百分比。显著增强的活性和对映选择性源于活性[(IPr)CuCF3]的初始生成以及其他铜物种的额外配位活化。