arylation of 2-iodoalkylarenes with diphenylzinc selectively at the γ C–H bond of the alkyl side chain. Several lines of evidence suggest that the iron catalyst reacts with the aryl iodide moiety of the substrate to generate an aryliron intermediate that behaves in a radical manner and cleaves the aliphaticC–H bond through1,5-hydrogentransfer; the resulting alkyliron intermediate undergoes reductive elimination
C–F Activation for C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Coupling by a Secondary Phosphine Oxide (SPO)-Nickel Complex
作者:Valentin Müller、Debasish Ghorai、Lorena Capdevila、Antonis M. Messinis、Xavi Ribas、Lutz Ackermann
DOI:10.1021/acs.orglett.0c02609
日期:2020.9.4
A secondary phosphine oxide (SPO)-nickel catalyst allowed the activation of otherwise inert C–F bonds of unactivated arenes in terms of challenging couplings with primary and secondary alkyl Grignard reagents. The C–F activation is characterized by mild reaction conditions and high levels of branched selectivity. Electron-rich and electron-deficient arenes were suitable electrophiles for this transformation
KO<sup><i>t</i></sup>Bu/DMF-Mediated Hydroalkylation of Alkenes via Benzylic C–H Bond Activation
作者:Qiming Zhu、Jiajia Long、Xianchen Song、Kaifang Wang、Jingkai Zeng、Yuyuan Fan
DOI:10.1021/acs.joc.3c02238
日期:2024.3.15
Catalytic hydroalkylation reaction of alkenes with benzylic hydrocarbons involving t-BuOK/DMF-mediated benzylic C–Hbond activation is demonstrated. This direct and operational simple protocol affords a rapid and reliable access to a wide scope of benzylic compounds in good-to-excellent yields. The benzylic C–H's of either activated diarylmethanes (pKa ∼ 32.2) and benzyl thioethers (pKa ∼ 30.8) or
证明了烯烃与苯甲基烃的催化加氢烷基化反应涉及t -BuOK/DMF 介导的苯甲基 C-H 键活化。这种直接且操作简单的方案可以快速、可靠地获得各种苄基化合物,且产率从良好到优异。活化二芳基甲烷(p K a ∼ 32.2)和苄基硫醚(p K a ∼ 30.8)或惰性烷基苯的苄基C-H都可以作为有用的合成平台,在温和的反应条件下方便地烷基化。
Electrochemically Enabled, Nickel-Catalyzed Dehydroxylative Cross-Coupling of Alcohols with Aryl Halides
作者:Zijian Li、Wenxuan Sun、Xianxu Wang、Luyang Li、Yong Zhang、Chao Li
DOI:10.1021/jacs.0c13093
日期:2021.3.10
chemical science, this functional group represents a highly attractive starting material for forging new C–C bonds. Here, we demonstrate that the combination of anodic preparation of the alkoxy triphenylphosphonium ion and nickel-catalyzed cathodic reductive cross-coupling provides an efficient method to construct C(sp2)–C(sp3) bonds, in which free alcohols and aryl bromides—both readily available chemicals—can