𝔖 Bobbio Scriptorium
✦   LIBER   ✦

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

✍ Scribed by Wayne W. Harding; Helen Jacobs; Stewart McLean; William F. Reynolds

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
97 KB
Volume
39
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

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.

📜 SIMILAR VOLUMES

1H and 13C NMR analysis of three quinone
1H and 13C NMR analysis of three quinone-methide triterpenoids
✍ A. A. Leslie Gunatilaka; H. Chandrasiri Fernando; Tohru Kikuchi; Yasuhiro Tezuka 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 311 KB

Detailed analysis of the 'H and 13C NMR spectra of three natural quinone-methide triterpenoids, pristimerin, tingenone and 20-hydroxytingenone, was carried out by the application of two-dimensional H-'H and ' H-13C shift correlation techniques. Some previous 'H and "C assignments have been revised.

Total assignment of 1H and 13C NMR spect
Total assignment of 1H and 13C NMR spectra of two isomeric triterpenoids
✍ F. J. Q. Monte; J. P. Kintzinger; R. Braz-Filho 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 204 KB 👁 2 views

The complete 1H and 13C assignment of two closely related isomeric triterpenoid derivatives (methyl 2a,3b-di-Oacetylolean-12-en-28-oate and methyl 2a,3a-di-O-acetylurs-12-en-28-oate) is described. In addition to 1D NMR methods, 2D shift-correlated NMR techniques (COSY, NOESY, HMBC and HMQC) were use

Structure assignment by 1H and 13C NMR o
Structure assignment by 1H and 13C NMR of two epimers derived from glycyrrhetic acid
✍ Alessandro Bongini; Michele Contento; Mario Orena; Giorgio Pifferi; Roberto Erba 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 153 KB

A full assignment of the 13C signals of four pentacyclic triterpenes confirms the results obtained by 'H NMR analysis of steroidal methyls, resolving the stereochemistry of the oxidation product of 3-~-acetoxyolean-12-en-30-oic acid methyl ester.

Complete assignments of 1H and 13C NMR s
Complete assignments of 1H and 13C NMR spectroscopic data for two new triterpenoid saponins from Ilex hainanensis
✍ Sixiang Zhou; Junshan Yang; Fucheng Liu; Pengfei Tu 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 118 KB 👁 1 views

## Abstract Two novel unsaturated E‐ring pentacyclic triterpenoid saponins, ilexhainanoside A and ilexhainanoside B, were isolated from the leaves of __Ilex hainanensis__. Their chemical structures were determined by MS, NMR spectroscopy and chemical analysis. Complete assignments of the ^1^H and ^

Complete assignments of 1H and 13C NMR s
Complete assignments of 1H and 13C NMR spectroscopic data for two new triterpenoid saponins from Ilex pernyi
✍ Guang-bo Xie; Lian-di Lei; Peng-fei Tu 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 126 KB 👁 1 views

## Abstract Ilexpernoside A and ilexpernoside B, two new pentacyclic C~4~‐nortriterpenoid saponins, were isolated from the leaves of __Ilex pernyi__ Franch. Their chemical structures were determined by MS, NMR spectroscopy and chemical analysis. Complete assignments of the ^1^H and ^13^C NMR spectr

Structure elucidation of two diphenylhyd
Structure elucidation of two diphenylhydantoin derivatives via 1H and 13C NMR spectroscopy
✍ M. Ciechanowicz-Rutkowska; L. Ragona; F. Greco; L. Zetta; M. Pegna 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 410 KB

## Abstract The solution conformations of 1‐benzyl‐5,5‐diphenyl‐2,4‐dioxo‐3‐imidazolidineacetic acid (AC) and 3‐(2,4‐dichlorobenzyl)‐5,5‐diphenyl‐2,4‐dioxo‐1‐imidazolidine acetic acid (AD) were studied by proton and carbon NMR spectroscopy. The two drugs have different pharmacological activities, A