Despite their anti-configurations three tricyclic nitrones, on heating in toluene, undergo high-yield [3 + 2] intramolecular addition to give the corresponding pentacyclic cages; a co-product from heating two of the nitrones in tetrachloroehylene is the pyridyl ketone.
D. Mackay and K. N. Watson, J. Chem. Soc., Chem. Commun., 1982, 777 DOI: 10.1039/C39820000777
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