Five eudesmanolides from Calostephane divaricata |
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| Authors: | Ferdinand Bohlmann Jasmin Jakupovic Maniruddin Ahmed |
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| Affiliation: | Institute for Organic Chemistry, Technical University of Berlin, D-1000 Berlin 12, West Germany |
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| Abstract: | The investigation of Calostephane divaricata afforded in addition to known compounds five new eudesmanolides, all being tri-substituted derivatives of 6-epi- α-cyclocostunolides. The structures were eluciated by highfield 1H NMR spectroscopy. The relative positions of the oxygen functions could not be stablished with certainty. The observed shift differences agreed well with the proposed structures. |
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| Keywords: | Compositae Inuleae sesquiterpene lactones eudesmanolides. |
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