malononitrile to vinyl phosphonates was accomplished by hydrogen bond-enhanced bifunctional halogen bond (XB) catalysis. NMR titration experiments were used to demonstrate that halogen bonding, with the support of hydrogen-bonding, played a key role in the activation of the Michael acceptors through the phosphonate group. This is the first example of the use of XBs for the activation of organophosphorus
丙二腈与
乙烯基膦酸酯的不对称迈克尔加成是通过氢键增强的双官能卤键(XB)催化完成的。核磁共振滴定实验证明,卤素键在氢键的支持下,在通过
膦酸酯基团激活迈克尔受体方面发挥了关键作用。这是在合成过程中使用 XB 来活化有机
磷化合物的第一个例子。此外,
碘代
全氟苯基被证明是比不同的
碘代和硝基取代的苯基更好的定向单元。所开发的方法提供了具有优异产率和非对映选择性以及良好对映选择性的产品。