Hirsutinolides,glaucolides and sesquiterpene lactone from Vernonia species |
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| Authors: | J. Jakupovic G. Schmeda-hirschmann A. Schuster C. Zdero F. Bohlmann R.M. King H. Robinson J. Pickardt |
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| Affiliation: | 1. Smithsonian Institution, Department of Botany, Washington, DC 20560, U.S.A.;2. Institute for Inorganic and Analytical Chemistry, Technical University of Berlin, D-1000 Berlin 12, West Germany |
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| Abstract: | The investigation of nine Vernonia species afforded in addition to known sesquiterpenes 28 new ones. The structures were elucidated by high field 1H NMR spectroscopy and the configurations were determined by NOE difference spectroscopy and, in one case, by X-ray analysis. The results indicated that configurations of several previously reported sesquiterpene lactones have had to be revised. In addition to known types two new ones, the jalcaguaianolides and the vernojalcanolides, are described. Furthermore some unusual reaction products are presented which, in part, led to some natural occurring lactones. |
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| Keywords: | Compositae sesquiterpene lactones hirsutinolides glaucolides vernoallenolides jalcaguaianolides vernojalcanolides. |
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