Harding, Wayne W.; Jacobs, Helen M.; McLean, Stewart; Reynolds, William F.
Author Affiliation, Ana.
Department of Chemistry
Structural and 1H and 13C analysis of two new glabretal triterpenoids derivatives from Guarea jamaicensis
Magnetic Resonance in Chemistry
Date of Publication
The ¹H and ¹³C NMR spectra of the glabretal derivatives, 21, 24-epoxy-3a, 7a, 21, 23-tetraacetoxy-25-hydroxy- 4a, 4b, 8b -trimethyl-14, 18-cyclo-5a, 13a,14a,17a-cholestane and 21,23-epoxy-3a,7a,21,24,25-pentaacetoxy-4a,4b,8b-trimethyl-14,18-cyclo-5a, 13a, 14a, 17a-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, ¹H, ¹H-COSY, ¹H, ¹³C-HSQC-¹ J(C,H), ¹H, ¹³C-HMBC nJ(C,H) (n=2 and 3) and 2D ¹H, ¹H-NOESY, were utilized.....