描述了 Ni( II ) 催化的各种导向基团与炔烃的芳族同系化,通过C-X 键断裂、炔烃插入和 C-H 活化提供高度取代的萘产物。该反应在吡唑类、咪唑并吡啶类、苯并咪唑并噻唑类、噻唑类和三唑类等多种导向基团与炔烃的作用下进行,以中等至高产率提供高度取代的萘。Ni( II )-络合物、锌粉和碱的简单、直接组合促进了这种转变。
描述了 Ni( II ) 催化的各种导向基团与炔烃的芳族同系化,通过C-X 键断裂、炔烃插入和 C-H 活化提供高度取代的萘产物。该反应在吡唑类、咪唑并吡啶类、苯并咪唑并噻唑类、噻唑类和三唑类等多种导向基团与炔烃的作用下进行,以中等至高产率提供高度取代的萘。Ni( II )-络合物、锌粉和碱的简单、直接组合促进了这种转变。
N-Arylation of nitrogen heterocycles with 2,4-difluoroiodobenzene
作者:Rukkiat Jitchati、Andrei S. Batsanov、Martin R. Bryce
DOI:10.1016/j.tet.2008.11.036
日期:2009.1
Arylation reactions of NH-heterocycles [specifically, pyrazole, 3-(trifluoromethyl)pyrazole, imidazole and pyrrole] with 2,4-difluoroiodobenzene in the absence and presence of copper catalysis are described. The combination of fluor and iodo substituents in the same aryl substrate has facilitated both SNAr reactions at the C-F bonds and copper-catalysed Ullmann-type coupling reactions at the C-I bond. Products arising from regioselective reactions and multiple substitutions have been isolated, providing a range of new N-arylated pyrazole, imidazole and pyrrole derivatives. (C) 2008 Elsevier Ltd. All rights reserved.