A selective palladium‐catalyzed C(sp) arylation/carbocyclization/iodonium migration reaction sequence has been accomplished. Novel 2‐iodo‐1‐aryl‐9H‐carbazoles are now easily available. As this result is contrary to the selectivity observed using gold catalysis, the formation of 2‐iodocarbazoles is noticeable, suggesting a metal‐controlled cyclization through chemo‐ and regioselective 1,2‐alkyl migration and 1,4‐iodonium migration.

中文翻译：

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钯催化同炔烃和碘鎓迁移的同炔丙基碘吲哚的加氢芳基化

已经完成了选择性钯催化的C（sp）芳基化/碳环化/碘迁移反应序列。新型2-碘-1--1-芳基-9 H-咔唑现已可轻松获得。由于此结果与使用金催化方法观察到的选择性相反，因此2-碘咔唑的形成非常明显，表明通过化学和区域选择性的1,2-烷基迁移和1,4-碘鎓迁移可实现金属控制的环化反应。