A catalytic stereodivergent intermolecular [5+2] cycloaddition of maltol-type oxidopyrylium through conjugative activation was reported, which featured high stereoselectivity, good compatibility and mild conditions, providing a convenient access route to various seven-membered heterocycles in moderate to excellent yields. In addition, a discrete mechanism was proposed to illustrate the stereoselectivity.

中文翻译：

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催化区域和立体选择性分子间[5 + 2]环加成反应，通过氧化op的共轭激活。

据报道，麦芽酚型氧化性霉菌通过共轭激活催化立体发散的分子间[5 + 2]环加成反应，具有高立体选择性，良好的相容性和温和的条件，为中等至优异的收率提供了方便的途径通往各种七元杂环。此外，提出了一种离散机制来说明立体选择性。