A novel and effective protocol for the synthesis of 2-substituted 3-halo-1H-indoles by PdX2/CuX2-catalyzed annulations of 2-ethynylbenzeneamines has been developed. In the presence of PdX2 and CuX2, the annulation reactions of a variety of 2-ethynylbenzeneamines were conducted in moderate to good yields. It is noteworthy that only N-acetyl-protected 2-ethynylbenzeneamines can undergo the reaction successfully.
通过 PdX2/CuX2 催化 2-
乙炔基
苯胺环化反应合成 2-取代的 3-卤基-1H-
吲哚的新颖而有效的方案已经开发出来。在 PdX2 和 CuX2 的存在下,多种 2-
乙炔基
苯胺的环化反应以中等至良好的收率进行。值得注意的是,只有 N-乙酰基保护的 2-
乙炔基
苯胺才能成功进行反应。