Using visible light as the driving force and O2 (in air) as the oxidant, we developed an efficient and enantioselective aerobic oxidation of 4-substituted pyrazolones by phase transfer catalysis. Broad scopes (38 examples) of pyrazolones bearing an oxygen-attached carbon stereocenter at C-4 position were obtained in high yields (up to 98%) and excellent enantioselectivities (up to 93% ee) under mid conditions.

中文翻译：

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相转移催化吡唑啉酮的可见光驱动对映选择性好氧氧化

以可见光为驱动力，O2（空气中）作为氧化剂，我们通过相转移催化开发了一种高效且对映选择性的好氧氧化 4-取代吡唑啉酮。在中等条件下，以高产率（高达 98%）和优异的对映选择性（高达 93% ee）获得了广泛范围（38 个实例）在 C-4 位带有氧连接的碳立体中心的吡唑啉酮。