Germacranolides from Gochnatia vernonioides |
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| Authors: | Ferdinand Bohlmann Guillermo Schmeda-Hirschmann Jasmin Jakupovic Robert M. King Harold Robinson |
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| Affiliation: | 2. Institute for Organic Chemistry, Technical University of Berlin, D-1000 Berlin 12, W. Germany;1. Smithsonian Institution, Department of Botany, Washington, DC 20560, U.S.A. |
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| Abstract: | The aerial parts of Gochnatia vernonioides afforded, in addition to dehydrocostus lactone, zaluzanin C and desacetyllaurenobiolide angelate, 14 further sesquiterpene lactones, ten 8, 12-and three 6,12-germacranolides as well as one eudesmanolide and three bisabolene derivatives. The structures were elucidated by spectroscopic methods and by comparing the data with those of closely related compounds. 8α-Angeloyloxytaraxic acid underwent an unusual autocatalysed cyclisation while the usual Cope rearrangement was not observed. |
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| Keywords: | Compositae sesquiterpene lactones germacranolides melampolide elephantopin derivative bisabolene derivatives. |
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