Abstract
The acid-catalyzed reaction of C4-methyl derivatives of levoglucosenone with ethanethiol and propane-1,3-dithiol was studied. The reaction takes a nontrivial route and involves intramolecular oxacyclization to form 2,5-dihydrofurans containing a thioacetal group at C5 in the side chain. The transformation provides a short way to synthesize chiral 2,5,5-trialkyl-substituted 2,5-dihydrofurans from levoglucosenone.
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Acknowledgments
Analyses were performed using the equipment of the Khimiya Center for Collective Use, Ufa Institute of Chemistry, Ufa Research Center, Russian Academy of Sciences.
Funding
The work was performed according to the State order (contract no. АААА-А17-117011910022-5) and financially supported by the Russian Foundation for Basic Research (project no. 17-43-020166 r_a).
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Russian Text © The Author(s), 2019, published in Zhurnal Organicheskoi Khimii, 2019, Vol. 55, No. 11, pp. 1680–1688.
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Davydova, A.N., Sharipov, B.T. & Valeev, F.A. Transformation of C4-Methyl Derivatives of Levoglucosenone to 2,5-Dihydrofurans. An Unexpected Intramolecular Oxacyclization. Russ J Org Chem 55, 1661–1668 (2019). https://doi.org/10.1134/S1070428019110034
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DOI: https://doi.org/10.1134/S1070428019110034