作者:Zhongxing Huang、Guangbin Dong
DOI:10.1016/j.tet.2018.03.017
日期:2018.6
design and development of two palladium-catalyzed redox cascade methods that enable direct β-arylation of ketones. Palladium-catalyzed ketone dehydrogenation, aryl-X bond activation and conjugate addition were merged into a redox-neutral catalytic cycle. Non-metal-based aryl electrophiles were used as both the oxidant and the aryl source. The β-arylation with aryl iodides was achieved site-selectively
在本文中,我们报告了一篇完整的文章,内容涉及可实现酮的直接β-芳基化的两种钯催化的氧化还原级联方法的详细设计和开发。钯催化的酮脱氢,芳基-X键活化和共轭加成反应合并到氧化还原中性催化循环中。非金属基芳基亲电试剂同时用作氧化剂和芳基源。用Pd(TFA)2 / P(i -Pr)3选择性地实现与芳基碘的β-芳基化作用作为前催化剂,AgTFA作为碘化物清除剂。环状和线性酮都可以反应生成具有出色的官能团耐受性的β-芳基酮。在没有化学计量的重金属添加剂的情况下,实现了带有二芳基碘鎓盐的β-芳基化反应,并证明是氧化还原中性的。对于与二芳基碘鎓盐的芳基化,获得了关于芳基和酮的较宽的底物范围,并且研究和讨论了钯纳米粒子作为活性催化剂的可能参与。