A new and efficient Pd-catalyzed cascade cyclization of biaryl-tethered o-alkynylanilines for the formation of dibenzo[a,c]carbazole derivatives has been reported. The use of the alkyl-substituted tertiary anilines together with the combination of the PdCl₂ catalyst with the MnO₂ oxidant and PivOH is vital for giving rise to 5-endo cyclization, C–N bond cleavage, and C–H bond activation in a cascade manner to produce the corresponding products with structural diversity.

中文翻译：

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Pd催化邻氨基炔苯胺通过C–H / C–N键断裂的级联环化反应生成二苯并[ a，c ]咔唑†

已经报道了新的且有效的Pd催化的联芳基连接的邻炔基苯胺的Pd级联环化反应，以形成二苯并[ a，c ]咔唑衍生物。一起使用烷基取代的叔胺的苯胺与的PdCl的组合₂催化剂与MNO ₂氧化剂和PivOH为引起5-至关重要内切在环化，C-N键断裂，和C-H键活化级联方式生产出具有结构多样性的相应产品。