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For recent examples of the use of 3-hydroxylated-THF's in the synthesis of complex polyethers, see: (a) Semmelhack, M. F.; Epa, W. R.; Cheung, W. -H.; Gu, Y.; Kim, C.; Zhang, N.; Lew, W. J. Am. Chem.Soc. 1994, 116, 7455-7456.
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Although the cyclization of hydroxy-epoxide precursors provides a highly versatile strategy for the preparation of 2,5-dialkyl THF's the related approach to 2,5-dialkyl-3-hydroxylated THF's from penten-1,3-diol-epoxides is not well known. (a) Hoye, T.R.; Tan, L. Tetrahedron Lett. 1995, 36, 1981-1984.
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For synthetic studies on kumausyne based on 3-hydroxylated-THF precursors, see: (a) Tonn, C. E.; Palazon, J. M.; Ruiz-Perez, C.; Rodriguez, M. L.; Martin, V. S. Tetrahedron Lett. 1995, 36, 5789-5792.
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0343240613
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note
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Carbohydrate and THF numbering is used for the pyranoside precursors and the THF products respectively. For easier comparison with our earlier work on 2,5-substituted THF's, the relative stereochemistry of the THF products is designated as 2,5-rather than 2,3-substituted derivatives. For THF's derived from R-allylic alcohol substrates: cis-2,5 = cis-2,3. For THF's derived from S-allylic alcohol substrates: cis-2,5 = trans-2,3.
-
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33
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0026712198
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The methylene proton syn to the substitutents on the adjacent carbons generally experiences diamagnetic shielding: Mihelich, E. D.; Hite, G. A. J. Am. Chem. Soc. 1992, 114, 7318-7319 and references cited.
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