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Fig. 1. Anthraquinones and Iridoids from the Fruits of M. citrifolia experiment (Fig. 4): ie, the proton signal at d 3.33 (H-5) showed a NOESY correlation with proton signals at d 2.96 (H-4), 5.40 (H-6) and 3.10 (H-9), indicating that the stereochemical relationship of a hydroxymethyl group at C-4 and the hydroxy group at C-6 was syn. Therefore, the structure of 7 was determined to be 1, 4-bis (hydroxymethyl)-3-hydroxy-3, 4, 6, 7, 3a, 7a-hexahydro-6-oxainden-5-one (IUPAC nomenclature). This is the first report of this compound from a natural source, and it has been named morindacin.