Abstract
Substituted 4H-pyrans were obtained in high preparative yields by the reaction of 1,5-diketones with acetic anhydride and boron trifluoride etherate in diethyl ether. It is assumed that the heterocyclization of 1,5-diketones includes a step involving the formation and transformations of an acyloxy carbonium ion.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 320–322, March, 1992.
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Blinokhvatov, A.F., Markovtseva, O.V. & Nikolaeva, M.N. Synthesis of 4H-pyrans by O-cyclization of 1,5-diketones. Chem Heterocycl Compd 28, 266–268 (1992). https://doi.org/10.1007/BF00529364
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DOI: https://doi.org/10.1007/BF00529364