Nickel-catalyzed cross-coupling reaction of carbamates with silylmagnesium reagents
作者:Vetrivelan Murugesan、Venkadesh Balakrishnan、Ramesh Rasappan
DOI:10.1016/j.jcat.2019.07.026
日期:2019.9
kinetically inert in cross-coupling reactions compared to those of carbon–halogen bonds. Thus, developing methodologies for the activation of CO bonds in cross-coupling reactions remains a major challenge. We disclose an unprecedented nickel mediated cross-coupling of carbamates with silylmagnesium reagents that does not require the expensive silylboranes. Silylmagnesium reagents were prepared from either silyllithium
与碳-卤素键相比,C O键在交叉偶联反应中具有动力学惰性。因此,开发用于交叉偶联反应中CO键活化的方法学仍然是主要挑战。我们公开了前所未有的镍介导的氨基甲酸酯与甲硅烷基镁试剂的镍介导的交叉偶联,不需要昂贵的甲硅烷基硼烷。甲硅烷基镁试剂是由甲硅烷基锂或甲硅烷基碘制备的。该方法的特征在于三甲基甲硅烷基偶联产物的合成及其合成应用。动力学研究和自由基钟实验揭示了限速C O键断裂,相对于催化剂的半数级和非自由基过渡态。