3‐Oxo‐12α‐hydroxyfriedelane from Maytenus gonoclada : structure elucidation by 1 H and 13 C chemical shift assignments and 2D‐NMR spectroscopy

3‐Oxo‐12α‐hydroxyfriedelane from Maytenus gonoclada : structure elucidation by 1 H and 13 C chemical shift assignments and 2D‐NMR spectroscopy

The compounds 3‐oxofriedelane (1), 3β‐hydroxyfriedelane (2), 3,11‐dioxofriedelane (3), 3,16‐dioxofrie delane (4) and 3‐oxo‐12α‐hydroxyfriedelane (5) were isolated from the hexane extract of Maytenus gonoclada Mart. ( Celastraceae ) leaves. Structural formula and the stereochemistry of the new pentac...

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Veröffentlicht in:Magnetic resonance in chemistry 2007-10, Vol.45 (10), p.895-898
Hauptverfasser: Oliveira, Mauro Lúcio G., Duarte, Lucienir Pains, Silva, Grácia Divina F., Filho, Sidney Augusto Vieira, Knupp, Vagner Fernandes, Alves, Fernando Gomes P.
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Sprache:eng
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Zusammenfassung:The compounds 3‐oxofriedelane (1), 3β‐hydroxyfriedelane (2), 3,11‐dioxofriedelane (3), 3,16‐dioxofrie delane (4) and 3‐oxo‐12α‐hydroxyfriedelane (5) were isolated from the hexane extract of Maytenus gonoclada Mart. ( Celastraceae ) leaves. Structural formula and the stereochemistry of the new pentacyclic triterpene 3‐oxo‐12α‐hydroxyfriedelane (5) were established through 1 H and 13 C NMR and DEPT 135 spectral data including 2D experiments (HMBC, HMQC, COSY, and NOESY) and mass spectrometry (GC‐MS). Copyright © 2007 John Wiley & Sons, Ltd.
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.2062