An alkylation/olefination cascade of indolecarboxaldehydes and phosphonate-functionalized donor–acceptor cyclopropanes affords functionalized dihydrocarbazoles and cyclohepta[cd]indoles in formal (3 + 3) and (4 + 3) cycloadditions. A minor modification to the reaction conditions also allows access to the fully aromatic heterocyclic scaffolds by thermal loss of an electron-rich aryl moiety.

中文翻译：

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通过供体-受体环丙烷的发散级联反应合成咔唑和二氢咔唑

吲哚甲醛和膦酸酯官能化的供体-受体环丙烷的烷基化/烯化级联以正式的 (3 + 3) 和 (4 + 3) 环加成提供官能化的二氢咔唑和环庚烷 [ cd ] 吲哚。对反应条件的微小修改还允许通过富含电子的芳基部分的热损失获得完全芳香族杂环支架。