Synthesis of bicyclic scaffolds has attracted growing interest because they are of high importance in modern pharmaceutical development. Here we report a strategy to access polysubstituted 2-oxabicyclo[2.1.1]hexanes in a single operation from readily accessible benzoylformate esters and bicyclo[1.1.0]butanes via visible-light-induced triplet energy transfer catalysis. The process is proposed to involve a formal [2π + 2σ] photocycloaddition/backbone C–H abstraction/aryl group migration sequence. A diverse range of (hetero)aryl groups successfully underwent migration to the backbone (C2) position to provide previously inaccessible bicyclic molecules, and the ester group of the product can serve as a handle for downstream manipulation, thus offering opportunities to rapidly build up molecular complexity and access new sp³-rich chemical space.

中文翻译：

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可见光诱导能量转移合成多取代 2-氧杂双环 [2.1.1] 己烷

双环支架的合成引起了越来越多的兴趣，因为它们在现代药物开发中非常重要。在这里，我们报告了一种策略，通过可见光诱导的三重态能量转移催化，从易于获得的苯甲酰甲酸酯和双环 [1.1.0] 丁烷中，在一次操作中获得多取代的 2-氧杂双环 [2.1.1] 己烷。该过程被提议涉及正式的 [2π + 2σ] 光环加成/主链 C-H 抽象/芳基迁移序列。各种各样的（杂）芳基成功地迁移到主链（C2）位置以提供以前无法接近的双环分子，并且产物的酯基可以作为下游操作的手柄，从而提供快速构建分子的机会复杂性和访问新的 sp ³-丰富的化学空间。