A new approach to directly access bicyclo[2.1.1]hexanes (BCHs) from easily prepared enol silyl ethers and bicyclo[1.1.0]butanes (BCBs) through formal [2π+2σ] cycloaddition was developed involving two-electron mediated process promoted by commercially available Lewis acids. This new reaction tolerated a wide range of enol silyl ethers and BCBs. In addition, a scale-up experiment and the synthetic transformations of the cycloadducts further highlighted the synthetic utility.
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Li et al. (2024) studied this question.
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