An indium(III)-catalyzed intramolecular dearomative cycloaddition of N-sulfonylaziridines to indoles has been developed, affording the divergent synthesis of rigid tetracyclic pyrroloindoline skeletons which are present in an array of fascinating natural products with interesting biological activities. In addition, in this reaction system, nonsubstituted indoles at the C3 position could smoothly react with N-sulfonylaziridines to form the desired dearomative cycloadducts for the first time.

中文翻译：

---

铟（III）催化的N-磺酰基氮丙啶分子内脱芳香环加成至吲哚：四环吡咯并吲哚啉骨架的简便合成

已开发出一种由铟（III）催化的N-磺酰基氮丙啶分子内脱芳香环加成到吲哚的化合物，可以合成刚性四环吡咯并吲哚啉骨架，这些骨架存在于一系列有趣的天然产物中，具有有趣的生物学活性。另外，在该反应系统中，在C3位的未取代的吲哚可与N-磺酰基氮丙啶平稳地反应，首次形成所需的脱芳香环加合物。