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[reaction: see text] A highly efficient (0.01 mol % of TfOH), operationally simple (room temperature, inexpensive, and commercially available catalyst), and diastereoselective (up to >98% de) method for Brønsted acid-catalyzed reaction of enol ethers to form cis-2,6-disubstituted tetrahydropyrans is disclosed.
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Puglisi et al. (2006) studied this question.
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