Thorpe-Ingold Effect in Branch-Selective Alkylation of Unactivated Aryl Fluorides
作者:Matthew J. O'Neill、Tim Riesebeck、Josep Cornella
DOI:10.1002/anie.201804479
日期:2018.7.16
Presented herein is a general protocol for the alkylation of simple aryl fluorides with unbiased secondary Grignard reagents by means of nickel catalysis. This study revealed a general Thorpe–Ingold effect in the ligand backbone which confers a high degree of selectivity for the secondary carbon center in the C−C coupling event. This protocol is characterized by mild reaction conditions, robustness
Ruthenium-Catalyzed Intermolecular Direct Silylation of Unreactive C(sp<sup>3</sup>)–H Bonds
作者:Wei Li、Xiaolei Huang、Jingsong You
DOI:10.1021/acs.orglett.5b03593
日期:2016.2.19
A Ru-catalyzed intermolecular silylation of unreactive, aliphatic C(sp3)–H bonds has been described for the first time. This protocol features low catalyst loading, a relatively broad substrate spectrum, good functional group tolerance, and no sensitivity to air, which provides a convenient and practical pathway for the construction of C–Si bonds.
catalysts including late transition metal, early transition metal, and s-block metalcomplexes displayed rich and versatile activity. Potassium amide could selectively achieve the benzylic alkylation of alkylpyridines, displaying distinct activity and regioselectivity. Here, the mechanistic investigation via both kinetic experiments and DFT calculations revealed the dimer structure of potassium amide and
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。