An unusual cobalt(III)-catalyzed cross-coupling/cyclization of aryl C–H bonds of N-nitrosoanilines with α-diazo-β-ketoesters has been achieved. This protocol features a unique combination of Csp²-H activation/Wolff rearrangement process, allowing for the rapid assembly of quaternary 2-oxindoles. The empirical evidence and density functional theory (DFT) calculations reveal the trapping process of transient acceptor ketene intermediates by cobalt metallocycles.

中文翻译：

---

Co（III）催化芳基CH键与涉及Wolff重排的α-重氮酮的偶联偶联环化

N-亚硝基苯胺与α-重氮-β-酮酸酯的钴（III）催化的不寻常交叉偶联/环化反应已经实现。该协议具有Csp ² -H激活/ Wolff重排过程的独特组合，可快速组装四级2-氧吲哚。经验证据和密度泛函理论（DFT）计算揭示了钴金属环对瞬态受体乙烯酮中间体的捕获过程。