of three kinds of different C–H activations with high catalytic efficiency, which allows ortho-unhindered N-arylimidazoliums to undergo a diarylation/annulation reaction, affording a variety of polysubstituted imidazo[1,2-f]phenanthridiniums. Neutral imidazo[1,2-f]phenanthridines are also prepared via a demethylation reaction of imidazo[1,2-f]phenanthridiniums.
在此,N-杂环卡宾定向的Ir( III )催化级联C-H芳基化/ N-芳基
咪唑与二芳基
碘鎓盐的环化首次通过四重C-H活化策略构建
咪唑[1,2 - f ]
菲啶鎓结构。该方案克服了三种不同 C-H 活化的相容性,具有高催化效率,允许邻位不受阻碍的N-芳基
咪唑鎓进行二芳基化/环化反应,得到多种多取代的
咪唑并[1,2- f ]
菲啶鎓。中性
咪唑并[1,2- f ]
菲啶也可通过以下方法制备
咪唑并[1,2- f ]
菲啶鎓的去甲基化反应。