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D:A friedo-oleanane lactones from the stems of Mallotus repandus
S Sutthivaiyakit1, J Thongtan, S Pisutjaroenpong
1Department of Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand, Chulabhorn Research Institute, Bangkok 10210, Thailand. somyote@ram1.ru.ac.th
Journal of Natural Products
|May 26, 2001
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.