Abstract
Three new D:A-friedo-oleanane lactones, viz., 3-oxo-D:A-friedo-oleanan-27,16alpha-lactone (1), 3alpha-benzoyloxy-D:A-friedo-oleanan-27,16alpha-lactone (2), and 3beta-hydroxy-D:A-friedo-oleanan-27,16alpha-lactone (3) were isolated from the stems of Mallotus repandus. Extensive use of NMR spectroscopic techniques led to full assignment of all 1H and 13C chemical shifts. The structure for 2 was confirmed by X-ray diffraction analysis.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Chromatography, Thin Layer
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Crystallography, X-Ray
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Euphorbiaceae / chemistry*
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Lactones / chemistry
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Lactones / isolation & purification*
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Magnetic Resonance Spectroscopy
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Mass Spectrometry
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Molecular Conformation
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Oleanolic Acid / analogs & derivatives
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Oleanolic Acid / chemistry
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Oleanolic Acid / isolation & purification*
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Plant Stems / chemistry
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Plants, Medicinal / chemistry*
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Thailand
Substances
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3-benzoyloxy-A-friedo-oleanan-27,16-lactone
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3-hydroxy-A-friedo-oleanan-27,16-lactone
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3-oxo-A-friedo-oleanan-27,16-lactone
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Lactones
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Oleanolic Acid