1. Dimeric xanthones from Garcinia livingstonei
- Author
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Matthias Hamburger, Isabelle Sordat-Diserens, Colin B. Rogers, and Kurt Hostettmannt
- Subjects
Garcinia livingstonei ,Diene ,biology ,Stereochemistry ,Dimer ,Plant Science ,General Medicine ,Horticulture ,biology.organism_classification ,Mass spectrometry ,Biochemistry ,chemistry.chemical_compound ,Monomer ,chemistry ,visual_art ,Xanthone ,visual_art.visual_art_medium ,Molecule ,Bark ,Molecular Biology - Abstract
From the root bark of Garcinia livingstonei , three xanthone dimers have been isolated. Structure elucidation was achieved mainly by NMR and mass spectrometry, including extensive NOE difference measurements, and by comparison with monomeric prenylated xanthones previously isolated from the same plant. Garcilivin A–C are structurally related to 1,4,5-trihydroxy-3-(3-methylbut-2-enyl)-9 H -xanthen-9-one and formally derive from the corresponding diene via dimerization by a Diels-Alder-type reaction.
- Published
- 1992