New 4a-quinopimaric acid derivatives were synthesized via a Diels–Alder reaction of levopimaric acid with 2-acetyl- or 2-(methoxycarbonyl)-1,4-benzoquinone and were characterized using elemental analysis and NMR spectroscopy. Thermodynamic and activation parameters of the Diels–Alder reactions of levopimaric acid and a model diene (7-isopropyl-1,2,3,4,4a,5-hexahydronaphthalene) with 2-acetyl- or 2-(methoxycarbonyl)-1,4-benzoquinone were calculated by density-functional theory in order to explain the observed regioselective cycloaddition.
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The work was sponsored by a Grant of the RF President for Leading Scientific Schools No. NSh-1700.2014.3.
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Translated from Khimiya Prirodnykh Soedinenii, No. 6, November–December, 2015, pp. 964–969.
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Vafina, G.F., Borisevich, S.S., Uzbekov, A.R. et al. Experimental and Theoretical Justification for the Regiospecific Cycloaddition of Levopimaric Acid to 2-Acetyl- or 2-(Methoxycarbonyl)-1,4-Benzoquinone. Chem Nat Compd 51, 1120–1125 (2015). https://doi.org/10.1007/s10600-015-1506-2
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DOI: https://doi.org/10.1007/s10600-015-1506-2