are able to overcome the reactivity issues of unactivated enamides, known as the least reactive carboxylic acid derivatives, toward alkylation with organomagnesium reagents. Allowing unequaled chemo-reactivity and stereocontrol in catalytic asymmetric conjugate addition to enamides, the method is distinguished by its unprecedented reaction scope, allowing even the most challenging and synthetically
在这里,我们报告说,容易获得的基于甲
硅烷基和
硼的
路易斯酸与手性
铜催化剂结合能够克服未活化的烯酰胺(被称为反应性最低的
羧酸衍
生物)对
有机镁试剂进行烷基化的反应性问题。在催化不对称共轭加成到烯酰胺中允许无与伦比的
化学反应性和立体控制,该方法以其前所未有的反应范围而著称,即使是最具挑战性和合成上重要的甲基化也能以良好的产率和出色的对映选择性完成。该催化协议可耐受较宽的温度范围(-78 °C 至环境温度)和放大(10 g),而手性催化剂可以重复使用而不会影响整体效率。