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Anthracene derivatives from Auxemma oncocalyx
W B Marques1, H S dos Santos, O D Pessoa
1Departamento de Química Orgánica e Inorgânica, Universidade Federal do Ceará, Fortaleza, Brazil.
Phytochemistry
|February 24, 2001
Summary
Three new anthracene derivatives, auxenone, oncocalyxonol, and auxemim, were isolated from Auxemma ontocalyx. Their chemical structures were elucidated using advanced spectral data analysis.
Area of Science:
- Natural Products Chemistry
- Organic Chemistry
- Phytochemistry
Background:
- The plant Auxemma ontocalyx is a source of bioactive natural products.
- Anthracene derivatives are known for diverse biological activities.
Purpose of the Study:
- To isolate and characterize novel anthracene derivatives from Auxemma ontocalyx.
- To determine the chemical structures of these isolated compounds.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation via comprehensive spectral analysis, including 1D and 2D NMR, IR, HREIMS, and UV spectroscopy.
Main Results:
- Three anthracene derivatives were successfully isolated: auxenone, oncocalyxonol, and auxemim.
- The detailed structures were determined as 1,4,8-trihydroxy-2-methoxy-5-methyl-9,10-anthraquinone, rel-9alpha,11alpha-epoxy-1,4,8alpha,11alpha-tetrahydroxy-2-methoxy-8a beta-methyl-5,6,7,8,8a,9, 10,10a beta-octahydro-10-anthracenone, and rel-8alpha,11beta-epoxy-2,11-dimethoxy-8a beta-methyl-5,6,7,8,8a,9-hexahydro-1,4-anthracenedione.
Conclusions:
- The study successfully identified and structurally characterized three unique anthracene derivatives from Auxemma ontocalyx.
- The findings contribute to the understanding of the chemical diversity of natural products from this plant species.