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

Oliveira Mauro Lúcio G. | Zendy; Duarte Lucienir Pains | Zendy; Silva Grácia Divina F. | Zendy; Filho Sidney Augusto Vieira | Zendy; Knupp Vagner Fernandes | Zendy; Alves Fernando Gomes P. | Zendy

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

Author(s) -

Oliveira Mauro Lúcio G.,

Duarte Lucienir Pains,

Silva Grácia Divina F.,

Filho Sidney Augusto Vieira,

Knupp Vagner Fernandes,

Alves Fernando Gomes P.

Publication year - 2007

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.2062

Subject(s) - chemistry , celastraceae , dept , triterpene , two dimensional nuclear magnetic resonance spectroscopy , stereochemistry , nuclear magnetic resonance spectroscopy , mass spectrometry , hexane , carbon 13 nmr , organic chemistry , chromatography , medicine , alternative medicine , pathology

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.

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