A new flavan, identified as 4 0 ,7-dihydroxy-8-prenylflavan, was isolated from the ethanolic extract of the stem bark of Brosimum acutifolium. Its structure was elucidated by NMR methods.
1H and 13C NMR structure determination of new sesquiterpene glycosides isolated from Pittosporum viridiflorum viridiflorum
✍ Scribed by Voahangy Ramanandraibe; Marcelle Rakotovao; François Frappier; Marie-Thérèse Martin
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 111 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.920
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The acetone extract of fresh leaves of Pittosporum viridiflorum viridiflorum afforded new sesquiterpene glycosides, 4‐O‐β‐D‐glucopyranosylgermacra‐1(10),5‐diene and its 6′‐O‐acetyl and 2′‐O‐acetyl derivatives, the structures of which were elucidated by NMR methods. Copyright © 2001 John Wiley & Sons, Ltd.
📜 SIMILAR VOLUMES
## Abstract An NMR study of a new stereoisomer of isoreserpiline pseudoindoxyl alkaloid is described. The complete ^1^H and ^13^C NMR assignments of the compound were carried out using COSY, HMQC and HMBC. Stereochemistry at carbons C‐2, C‐3, C‐15, C‐20 and C‐19 was established using values of ^1^H
The seeds of Mimusops elengi yielded a new triterpene, mimusic acid, whose structure was elucidated as 2b,3b,16a,23-tetrahydroxyoleana-5,13(18)-dien-28-oic acid by NMR spectral studies. The detailed 1H and 13C NMR resonance assignments of this compound and of the previously reported congener mimusop
## Abstract Four new oligosaccharides (1–4), one new pregnane glycoside (5), and one new cardiac glycoside (6) were isolated from the roots of __Periploca forrestii__ Schltr. (Asclepiadaceae), a traditional Chinese medicine used for the treatment of rheumatoid arthritis and wounds. Their structures
## Abstract Two new sesquiterpenes, epi‐guaidiol A (1) and sugebiol (3), together with four known sesquiterpenes, guaidiol A(2), sugetriol triacetate (4), cyperenoic acid (5), and cyperotundone (6) were isolated from the rhizomes of __Cyperus rotundus__ L. Their structures were identified by MS and