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Structural and 1 H and 13 C NMR analysis of two new glabretal triterpenoid derivatives from Guarea jamaicensis
Author(s) -
Harding Wayne W.,
Jacobs Helen,
McLean Stewart,
Reynolds William F.
Publication year - 2001
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.926
Subject(s) - chemistry , heteronuclear single quantum coherence spectroscopy , two dimensional nuclear magnetic resonance spectroscopy , proton nmr , stereochemistry , carbon 13 nmr , nmr spectra database , cholestane , spectral line , physics , astronomy
The 1 H and 13 C NMR spectra of the glabretal derivatives, 21,24‐epoxy‐3α, 7α, 21,23‐tetraacetoxy‐25‐hydroxy‐4α,4β,8β‐trimethyl‐14,18‐cyclo‐5α,13α,14α,17α‐cholestane and 21,23‐epoxy‐3α,7α,21,24,25‐pentaacetoxy‐4α,4β,8β‐trimethyl‐14,18‐cyclo‐5α,13α,14α,17α‐cholestane, obtained from an acetylated fraction of extracts of Guarea jamaicensis , were completely assigned. 1D NMR and a number of 2D shift correlated NMR experiments, 1 H, 1 H‐COSY, 1 H, 13 C‐HSQC‐ 1 J (C,H), 1 H, 13 C‐HMBC n J (C,H) ( n = 2 and 3) and 2D 1 H, 1 H‐NOESY, were utilized. Copyright © 2001 John Wiley & Sons, Ltd.