In the presence of hypervalent iodine reagents, silyl-substituted δ,ε-unsaturated alcohols (4a–f) underwent ring-closure to give the pyran-3-ones (5) as well as tosyloxy substituted tetrahydropyrans (6) and (7).
E. Schaumann and A. Kirschning, J. Chem. Soc., Perkin Trans. 1, 1990, 1481 DOI: 10.1039/P19900001481
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