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  • Title: New dammarane triterpenes from the aerial parts of Ibicella lutea grown in Argentina.
    Author: Simirgiotis MJ, Jiménez C, Rodríguez J, Giordano OS, Tonn CE.
    Journal: J Nat Prod; 2003 Dec; 66(12):1586-92. PubMed ID: 14695802.
    Abstract:
    Two new dammarane triterpenes have been isolated from the aerial parts of Ibicella lutea, 3-acetyl-24-epi-polacandrin (1) and 1,3-diacetyl-24-epi-polacandrin (2), and were obtained along with the known compounds 20S,24S-epoxy-3beta,12beta,25-trihydroxydammarane (3) and apigenin. The structures of compounds 1 and 2 were deduced by spectroscopic studies and by chemical transformations leading to the preparation of derivatives 4-11. The structure and relative stereochemistry of 1 were verified by single-crystal X-ray analysis. The natural compounds and selected semisynthetic derivatives were evaluated against several tumor cells.
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