irradiation in the presence of catalytic amounts of [(DPEphos)(bcp)Cu]PF6 and an amine, a range of unactivated aryl and alkyl halides were shown to be smoothly activated through a rare Cu(I)/Cu(I)*/Cu(0) catalytic cycle. This complex efficiently catalyzes a series of radical processes, including reductions, cyclizations, and direct arylation of arenes.
available catalysts based on inexpensive, environmentally benign base metals are therefore strongly needed. Furthermore, expanding the toolbox of methods based on photoredox catalysis will facilitate the discovery of new light-mediated transformations. This article details the use of a simple copper complex which, upon activation with blue light, can initiate a broad range of radicalreactions.
A simple and efficient method for radical hydrodeiodination is reported. The novel approach uses electron catalysis. In situ generated Na‐alcoholates are introduced as radical chain reducing reagents and reactions work with O2 as cheap initiator. Hydrodeiodination works on aryl, alkenyl, alkynyl iodides and a tert‐alkyliodide also gets reduced applying the method. Albeit less general, the method is
Transition-Metal-Free Radical C(sp<sup>3</sup>)–C(sp<sup>2</sup>) and C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Coupling Enabled by 2-Azaallyls as Super-Electron-Donors and Coupling-Partners
作者:Minyan Li、Simon Berritt、Lucas Matuszewski、Guogang Deng、Ana Pascual-Escudero、Grace B. Panetti、Michal Poznik、Xiaodong Yang、Jason J. Chruma、Patrick J. Walsh
DOI:10.1021/jacs.7b09394
日期:2017.11.15
and alkyl radicals. The SET process converts the 2-azaallyl anions into persistent 2-azaallyl radicals, which capture the aryl and alkyl radicals to form C-C bonds. The radicalcoupling of aryl and alkyl radicals with 2-azaallyl radicals makes possible the synthesis of functionalized amine derivatives without the use of exogenous radicalinitiators or transition metal catalysts. Radical clock studies
过去十年见证了自由基生成策略及其在CC成键反应中的应用的快速发展。大多数这些过程需要引发剂、过渡金属催化剂或有机金属试剂。在此,我们报告了一种简单的有机系统(2-氮杂烯丙基阴离子)的发现,该系统可以在无过渡金属的条件下实现自由基偶联反应。N-苄基酮亚胺的去质子化产生半稳定的 2-氮杂烯丙基阴离子,其充当“超级电子给体”(SED),并将芳基碘和烷基卤还原为芳基和烷基。SET 过程将 2-氮杂烯丙基阴离子转化为持久的 2-氮杂烯丙基自由基,捕获芳基和烷基自由基形成 CC 键。芳基和烷基与2-氮杂烯丙基的自由基偶联使得在不使用外源自由基引发剂或过渡金属催化剂的情况下合成官能化胺衍生物成为可能。自由基时钟研究和 2-氮杂烯丙基阴离子偶联研究为这种独特的反应性提供了机制见解。