New acylated triterpene saponins from Polygala tenuifolia willd
Two new acylated presenegenin glycosides E -onjisaponin H ( 5 ) and Z -onjisaponin ( 6 ) together with seven known saponins were isolated from the roots of Polygala tenuifolia Willd. Compounds 5 and 6 were obtained as a pair of isomers due to trans and cis - p -methoxycinnamoyl. Their structures were elucidated mainly by 2D-NMR techniques including 1 H– 1 HCOSY, TOCSY, HSQC, HMBC as 3- O -(-d-glucopyranosyl) presenegenin 28-{ O --d-apiofuranosyl-(1 → 3)- O -[-d-xylopyranosyl-(1 → 4)]- O -α-l-rhamnopyranosyl-(1 → 2)- O -[α-l-rhamnopyranosyl-(1 → 3)]-4- O -[( E )- p -methoxycinnamoyl]--d-fucopyranosyl} ester ( 5 ) and its ( Z )-isomer ( 6 ).
Keywords: E -Onjisaponin H; Polygala tenuifolia; Triterpene saponin; Z -Onjisaponin H
Document Type: Research Article
Affiliations: School of Pharmaceutical Sciences, Peking University Health Science Center, Department of Natural Medicines, Beijing, 100083, China
Publication date: 01 September 2006
- Access Key
- Free content
- Partial Free content
- New content
- Open access content
- Partial Open access content
- Subscribed content
- Partial Subscribed content
- Free trial content