(+)-Usninic acid was brominated at the acetyl group located on the aromatic ring. Aurones were synthesized based on the intramolecular cyclization of monobrominated (+)-usninic acid.
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Translated from Khimiya Prirodnykh Soedinenii, No. 3, May–June, 2012, pp. 350–355.
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Luzina, O.A., Sokolov, D.N., Shernyukov, A.V. et al. Synthesis of aurones based on usninic acid. Chem Nat Compd 48, 385–391 (2012). https://doi.org/10.1007/s10600-012-0258-5
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DOI: https://doi.org/10.1007/s10600-012-0258-5