A facile Pd-catalyzed cascade of intramolecular Heck cyclization/alkylpalladium activated dearomatization of aryl alkyne-tethered indole is described. In this single step two nonadjacent all-carbon quaternary centers, two nitrogen-containing heterocycles, and three C(sp²)–C(sp³) bonds are efficiently furnished. These products could also undergo 5-to-6 ring migration-expansion reaction under Brønsted-acid conditions to transform into the benzo[c]carbazole skeletons.

中文翻译：

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Pd 催化级联分子内 Heck 环化/吲哚脱芳构化构建两个全碳季铵盐中心

描述了芳基炔烃栓系吲哚的分子内 Heck 环化/烷基钯激活脱芳构化的简便 Pd 催化级联。在这一步中，两个不相邻的全碳季铵盐中心、两个含氮杂环和三个 C(sp ² )–C(sp ³ ) 键被有效地提供。这些产物还可以在布朗斯台德酸条件下进行 5 至 6 环迁移-扩展反应，转化为苯并 [ c ] 咔唑骨架。