Palladium-catalyzed intramolecular tandem cyclization reactions were conducted for the synthesis of densely cis/cis-fused aza-tetracyclic structures. The process involved a palladium(II)-catalyzed aerobic aza-Wacker reaction, followed by a palladium(0)-catalyzed Heck reaction. The effects of the solvent and benzene substitution pattern on the one-pot, two-step cascade reaction were studied systematically, and a probable mechanism was proposed. Strained pentahydrobenzo[f]cyclopenta[hi]indolizin-6-one and racemic γ-lycorane can also be synthesized rapidly using this palladium-catalyzed aza-Wacker–Heck cyclization reaction.

中文翻译：

---

钯催化立体选择性Aza-Wacker-Heck环化：四环融合杂环的一锅逐步策略

进行了钯催化的分子内串联环化反应，以合成致密的顺式/顺式稠合的氮杂四环结构。该过程涉及钯（II）催化的好氧aza-Wacker反应，然后是钯（0）催化的Heck反应。系统地研究了溶剂和苯的取代方式对一锅两步级联反应的影响，并提出了可能的机理。使用钯催化的aza-Wacker-Heck环化反应，也可以快速合成应变的五氢苯并[ f ]环戊基[ hi ]吲哚并嗪-6-和外消旋的γ-二十烷。