Antibacterial triterpenoids from Dillenia papuana and their structure-activity relationships |
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Authors: | Andr Nick Anthony D Wright Topul Rali Otto Sticher |
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Institution: | a Department of Pharmacy, Swiss Federal Institute of Technology (ETH) Zurich, CH-8057, Zürich, Switzerland b Chemistry Department, University of Papua New Guinea, Port Moresby, Papua New Guinea |
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Abstract: | Two new oleanene-type triterpenoids, dillenic acids D and E, have been isolated from the leaves and stems of Dillenia papuana together with the new natural product 3-oxoolean-12-en-30-oic acid. Together with these compounds, the known compound, betulinic acid (3β-hydroxy-20(29)-lupen-28-oic acid) was isolated as the major component of the fractions studied. Dillenic acids D and E were characterized as 2,3-seco-2-oxoolean-12-en-3-methylester-30-oic acid and 1,3β-dihydroxyolean-12-en-30-oic acid and their nuclear magnetic resonance data were unambiguously assigned using two-dimensional nuclear magnetic resonance techniques. A comparison of antibacterial activities of these compounds with the earlier reported dillenic acids A-C indicated that, aside from a double bond in γ- or δ-position to a carboxylic group, a ketone function in ring A of an oleanene-skeleton may be required for the observed activity. |
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