Labdane derivatives and flavones from Gutierrezia dracunculoides |
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Authors: | Ferdinand Bohlmann Michael Grenz Autar K Dahr Mark Goodman |
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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. Department of Botany, University of Oklahoma, Oklahoma, U.S.A. |
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Abstract: | An investigation of the aerial parts of Gutierrezia dracunculoides afforded, in addition to known compounds, three new labdane derivatives, all related to lambertianic acid, 17-hydroxy- and 17-acetoxylambertianic acid and 7α- hydroxylambertianic acid, two esterified and three highly oxygenated flavones, 5,7,4′-trihydroxy-3,3′-dimethoxy- flavone-4′-O- 2-methylbutyrate] and isovalerate, 3′,5′-dihydroxy-3,5,6,7,8,4′-hexamethoxyflavone, 5,3′,5′-trihydroxy- 3,6,7,8,4′-pentamethoxyflavone and 5,7,3′,5′-tetrahydroxy-3,6,8,4′-tetramethoxyflavone. The structures were elucidated by spectroscopic methods and a few chemical transformations. |
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Keywords: | Compositae new labdane derivatives: new flavones |
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