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  • Title: Operationally simple, efficient, and diastereoselective synthesis of cis-2,6-disubstituted-4-methylene tetrahydropyrans catalyzed by triflic acid.
    Author: Puglisi A, Lee AL, Schrock RR, Hoveyda AH.
    Journal: Org Lett; 2006 Apr 27; 8(9):1871-4. PubMed ID: 16623572.
    Abstract:
    [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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