Aromatic substituent effects in palladium-catalyzed intramolecular olefin oxyarylation reactions
作者:Mark C. Maust、Zacary L. Croft、Mackenzie W. Sullivan、Ross L. Dove、Emily E. Hardy、W.E. Brenzovich
DOI:10.1016/j.tetlet.2020.151674
日期:2020.3
The effect of electron-donating groups on the palladium-catalyzed intramolecular oxyarylation reaction was studied. In the case of activation at the ortho-position, the reaction favors the formation of a tricyclic lactone via C-H insertion. However, when the ipso-position is activated, the major product is instead a novel α,β-unsaturated lactone formed by way of a stabilized phenonium intermediate
研究了供电子基团对钯催化的分子内氧合反应的影响。在邻位活化的情况下,该反应有利于通过CH插入形成三环内酯。然而,当ipso-位被活化时,主要产物而是通过稳定的on中间体然后消除而形成的新型α,β-不饱和内酯。