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Cytotoxic sesquiterpene lactones from Vernonia pachyclada from the Madagascar rainforest
Russell B Williams1, Andrew Norris, Carla Slebodnick
1Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212, USA.
Journal of Natural Products
|September 27, 2005
Abstract:
Bioassay-guided fractionation of the cytotoxic leaf extract of Vernonia pachyclada Baker led to the isolation of three new sesquiterpene lactones, designated glaucolides K-M (1-3). The structures of the new compounds were determined using 1D and 2D NMR spectroscopy, and the structure and stereochemistry of 1 were confirmed by single-crystal X-ray diffraction. Compound 3 showed moderate activity in the A2780 human ovarian cancer cell line, with an IC50 of 3.3 microM.