Allenic germacranolides,bourbonene derived lactones and other constituents from Vernonia species |
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Authors: | Ferdinand Bohlmann Jasmin Jakupovic Rajinder K Gupta Robert M King Harold Robinson |
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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: | An investigation of seven Vernonia species, mainly from northern Brazil, afforded in addition to known compounds three new unusual sesquiterpene lactones with an allenic group. Intensive NMR studies fully established the structures. Furthermore, two lactones derived from bourbonene, two new glaucolides, a new furansesquiterpene, a nerolidol derivative and two other sesquiterpenes derived from eudesmane were isolated. The biogenetic relationships of the sesquiterpene lactones present in Veronia species as well as the chemotaxonomic aspects are discussed. |
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Keywords: | Compositae sesquiterpene lactones allenic germacranolides bourbonene derived lactones new glaucolides furansesquiterpenes nerolidol derivatives eudesmanes |
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