1-Benzothiopyranylium salts 1 underwent polar cycloaddition with conjugated dienes 2 to give benzo-fused bicyclic sulfonium salts 3 having sulfur at a bridgehead position in good yields, which were easily transformed into spiro compounds 4 and 5 by treatment with base.
H. Shimizu, S. Miyazaki, T. Kataoka and M. Hori, J. Chem. Soc., Chem. Commun., 1992, 1586 DOI: 10.1039/C39920001586
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