Starting from simple anilines and ester arylpropiolates, an efficient one-pot synthesis of 2-arylindole-3-carboxylate derivatives has been developed through copper-mediated sequential hydroamination and cross-dehydrogenative coupling (CDC) reaction. The initial hydroamination of anilines to ester arylpropiolates in benzene can proceed in a stereoselective manner to give ester (Z)-3-(arylamino)acrylates in the presence of CuCl₂/phenanthroline, KMnO₄, and KHCO₃ at 120 °C. Sequentially, these in situ functionalized adducts can undergo direct intramolecular oxidative alkenylation of aromatic C–H bond in mixed solvents (benzene/DMSO 1:1) at 130 °C affording multi-substituted­ indoles in good to high yields.

中文翻译：

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通过顺序加氢胺化和交叉脱氢偶联反应的铜介质一锅合成吲哚

从简单的苯胺和芳基丙酸酯酯开始，通过铜介导的顺序加氢胺化和交叉脱氢偶联（CDC）反应，开发了一种有效的一锅合成2-芳基吲哚-3-羧酸酯衍生物。苯胺在苯中的初始加氢胺化为芳基丙酸酯可在120°C下在CuCl ₂ /菲咯啉，KMnO ₄和KHCO ₃存在下以立体选择性方式进行酯化（Z）-3-（芳基氨基）丙烯酸酯。因此，这些原位官能化的加合物可以在130°C的混合溶剂（苯/ DMSO 1：1）中直接进行芳族CH键的分子内氧化烯化反应，从而以良好或高收率获得多取代的吲哚。