suitable for this transformation. Similarly, N-Ts and N-Boc groups were compatible with reaction conditions, whereas N-Ac and N-Tf failed to undergo this reaction. Isolation of vinyl chloride intermediate suggested the involvement of a vinylic carbocation intermediate. A mechanism has been proposed involving a ring-opening–ring-closing cascade followed by a 1,3-indole migration process via a spirocyclobutene
已经报道了由3-
吲哚基
甲醇和
炔烃酸促进的环戊[ b ]
吲哚骨架的合成。整个变换表示通过重新排列而形成的正式[3 + 2]圆环。该方案对
甲醇底物和
炔烃显示出良好的通用性,并允许生成结构多样的环戊[ b ]
吲哚。发现末端
炔烃,二烷基取代的内部
炔烃和具有电子不足的取代基的
炔烃不适合该转化。同样,N -Ts和N -Boc基团与反应条件兼容,而N -Ac和N-Tf未能进行此反应。
氯乙烯中间体的分离表明涉及
乙烯基碳阳离子中间体。已经提出了一种机制,包括开环-闭环级联反应,然后通过螺
环丁烯中间体进行1,3-
吲哚迁移过程。