New Bifunctional Substrates for Copper-Catalyzed Asymmetric Conjugate Addition Reactions with Trialkylaluminium
作者:Chehla Ladjel、Nicolas Fuchs、Jinkai Zhao、Gérald Bernardinelli、Alexandre Alexakis
DOI:10.1002/ejoc.200900662
日期:2009.10
Trialkylaluminium reagents have been found to undergo a copper-catalyzed asymmetric conjugate addition (ACA) reaction with oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylates with the simultaneous creation of two stereocenters. Different types of ligands were tested, and chiral phosphoramidite ligands allowed the reaction to proceed with good yields and good to excellent enantioselectivity. The syn
已发现三烷基铝试剂与氧杂双环 [2.2.1] 庚-2,5-二烯-2,3-二羧酸酯发生铜催化的不对称共轭加成 (ACA) 反应,同时产生两个立体中心。测试了不同类型的配体,手性亚磷酰胺配体使反应能够以良好的产率和良好的对映选择性进行。通过 X 射线分析观察到的顺式取代产物表明亲核试剂的外切攻击。在此,我们报告了在这种铜催化 ACA 方法的开发中获得的结果,该方法提供了具有未取代和取代的氧杂环迈克尔受体的全碳四元中心。该研究是通过为阐明原始反应途径而进行的机理研究完成的。