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Sesquiterpene lactones and diterpenoids from Helianthus argophyllus |
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| Authors: | Keisuke Watanabe Nobuo Ohno Hirosuke Yoshioka Jonathan Gershenzon Tom J Mabry |
| Institution: | 1. Department of Botany, The University of Texas at Austin, Austin, TX 78712, U.S.A. |
| Abstract: | Three germacranolide sesquitepene lactones (argophyllin-A and -B and eupatolide), three diterpenoids (ciliaric acid, (?)-16-α-hydroxy-kaur-11-en-19-oic acid and (?)-16-α-hydroxykaurane) and one flavonoid (nevadensin) were isolated and characterized from a chloroform extract of Helianthus argophyllus. Argophyllin-A and -B are both described here for the first time. Their structures were deduced by 1H NMR and 13C NMR. Argophyllin-A and -B were found to show anti-auxin effects while eupatolide exhibited weak insecticidal activity. |
| Keywords: | Compositae germacranolides argophyllin-A argophyllin-B eupatolide ciliaric acid (?)-16-α-hydroxy-kaur-11-en-19-oic acid (?)-16-α-hydroxykaurane nevadensin |
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