Structural and 1H and 13C NMR analysis of two new glabretal triterpenoid derivatives from Guarea jamaicensis

被引：7
|
作者：
Harding, WW
Jacobs, H
McLean, S
Reynolds, WF
机构：
[1] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada
[2] Univ W Indies, Dept Chem, Kingston 7, Jamaica
来源：
MAGNETIC RESONANCE IN CHEMISTRY | 2001年 / 39卷 / 11期
关键词：
H-1; NMR; C-13; glabretal triterpenoids; H-1 and C-13 chemical shift assignments; Guarea jamaicensis; Meliaceae;
D O I：
10.1002/mrc.926
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The H-1 and C-13 NMR spectra of the glabretal derivatives, 21,24-epoxy-3 alpha ,7 alpha ,21,23-tetraacetoxy-25-hydroxy-4 alpha ,4 beta ,8 beta -trimethyl-14,18-cyclo-5 alpha ,13 alpha ,14 alpha ,17 alpha -cholestane and 21,23-epoxy-3 alpha ,7 alpha ,21,24,25-pentaacetoxy-4 alpha ,4 beta ,8 beta -trimethyl-14,18-cyclo-5 alpha ,13 alpha ,14 alpha ,17 alpha -cholestane, obtained from an acetylated fraction of extracts of Guarea jamaicensis, were completely assigned. ID NMR and a number of 2D shift correlated NMR experiments, (HH)-H-1-H-1-COSY, H-1,C-13-HSQC-(1)J(CH), H-1,C-13-HMBC (n)J(CH) (n = 2 and 3) and 2D H-1,H-1-NOESY, were utilized. Copyright (C) 2001 John Wiley & Sons, Ltd.
引用
收藏
页码：719 / 722
页数：4
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