A simple and environmental-friendly method for the construction of acridone derivatives with isatins and arynes was described. The isatins underwent a ring expansion process oxidized by O₂ in the air and a broad scope of acridones in moderate to good yields were obtained. Baeyer-Villiger-type oxidation and intermolecular-nucleophilic addition were included, and no extra oxidant except O₂ was needed.

中文翻译：

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空气中 O2 氧化芳烃与靛红扩环合成吖啶酮

描述了一种用靛红和芳烃构建吖啶酮衍生物的简单且环保的方法。_{靛红经历了被空气中的 O 2}氧化的扩环过程，并以中等至良好的产率获得了广泛的吖啶酮。包括Baeyer-Villiger型氧化和分子间亲核加成，除O ₂外不需要额外的氧化剂。