2-arylated imidazoles could be obtained in moderate to good yields through inert C–N bond cleavage. The imidazolium salt in this reaction acts as both a coupling partner and N-heterocyclic carbene (NHC) ligand precursor. Mechanistic studies reveal that consecutive steps of migratory insertion of the NHC into the aryl C–Ni bond and β-C elimination might be involved in the proposed reaction mechanism.
我们在此提出了芳基卤化物和腈与
咪唑鎓盐的
镍催化交叉偶联反应。通过惰性 C-N 键断裂,可以以中等至良好的产率获得一系列 2-芳基化
咪唑。该反应中的
咪唑鎓盐既充当偶联配偶体,又充当N-杂环卡宾 (NHC)
配体前体。机理研究表明,NHC 迁移插入芳基 C-Ni 键和 β-C 消除的连续步骤可能参与了所提出的反应机理。