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

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

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
125 KB
Volume
45
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

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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