Tricyclic sesquiterpenes and further diterpenes from Espeletiopsis species |
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| Authors: | F Bohlmann H Suding J Cuatrecasas H Robinson RM King |
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| Institution: | 1. Institute for Organic Chemistry, Technical University Berlin, Strasse des 17.Juni 135,D-1000 Berlin 12, W. Germany;2. Smithsonian Institution, Washington, DC 20560, U.S.A. |
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| Abstract: | The investigation of five Espeletiopsis and two Coespeletia species afforded, in addition to numerous known compounds, two new kaurene derivatives 19-acetoxy-ent-kaurene and 17-oxo-ent-kaur- 15-en-19-oic acid, as well as two new tricyclic sesquiterpenes, one being the previously reported oxidation product of copaborneol and the second one the 5-oxo derivative of silphiperfol-6-ene. The structures were elucidated by NMR studies and by chemical transformations. The chemotaxonomic situation is discussed briefly. |
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| Keywords: | Compositae Heliantheae new sesquiterpene ketones |
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