Six new melampolides from Tetragonotheca helianthoides |
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| Authors: | F.C. Seaman N.H. Fischer |
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| Affiliation: | Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, U.S.A. |
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| Abstract: | Chemical analysis of Tetragonotheca helianthoides L. yielded six new melampolide-type sesquiterpene lactones, tetrahelins A–F. All new compounds have the same medium ring skeleton and differ by the ester moieties at C-8 and C-9. Tetrahelin A and B contain the side chain 2-methyl-2,3-diacetoxybutanoate and tetrahelin E 3-hydroxy-3-methylbutanoate. Both ester side chains have previously not been found in sesquiterpene lactones. |
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| Keywords: | Compositae Heliantheae sesquiterpene lactone melampolides. |
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