Excellent yields of methyl tetrahydrofuran-α-carboxylates are obtained by treatment of 2-O-trifluoromethanesulfonates (triflates) of either 1,4-or 1,5-lactones with acid in methanol; in some cases, very different tetrahydrofurans may result from acid or base treatment of a methanolic solution of the same starting material.
J. R. Wheatley, C. J. F. Bichard, S. J. Mantell, J. C. Son, D. J. Hughes, G. W. J. Fleet and D. Brown, J. Chem. Soc., Chem. Commun., 1993, 1065 DOI: 10.1039/C39930001065
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