The photoinduced carbonyl ylides B and C from the α,β-unsaturated γ,δ-epoxy dinitriles 2 and 3 undergo 1,3-dipolar cycloaddition with enol ethers, leading regioselectively to the 8-oxabicyclo[3.2.1]octane system.
M. Kotera, K. Ishii, O. Tamura and M. Sakamoto, J. Chem. Soc., Perkin Trans. 1, 1994, 2353 DOI: 10.1039/P19940002353
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