under aerobic conditions is described. The precursors, 3-dienylindoles, are formed via Friedel–Crafts alkenylation followed by isomerization reactions of 2-substituted indoles with tertiary propargyl alcohols under Brønsted acid mediation. The methyl (sp3-C) group present in the propargyl alcohol becomes a part of a six-membered ring in the final ring-expansion products, the cyclopenta[c]quinolines
描述了在有氧条件下
铜催化的3-二烯基
吲哚的氧化环扩容/分子内亲电取代反应,生成环戊[ c ]
喹啉和3-
茚基
吲哚。前驱物3-二烯基
吲哚是通过Friedel-Crafts烯基化反应,然后在Brønsted酸介导下,将2-取代的
吲哚与叔炔
丙醇进行异构化反应而形成的。炔
丙醇中存在的甲基(sp 3 -C)成为最终扩环产物中的六元环的一部分,所述六元环是具有荧光活性的环戊[ c ]
喹啉。基于这些观察,发现了一种新颖的一锅策略,用于从
吲哚到环戊[ c ]
喹啉的环扩展。