NEW BITTER SAPONINS FROM THE BARK OF COLUBRINA-ELLIPTICA - H-1 AND C-13 ASSIGNMENTS BY 2D NMR-SPECTROSCOPY

Authors
TINTO WF REYNOLDS WF SEAFORTH CE MOHAMMED S MAXWELL A
Citation
Wf. Tinto et al., NEW BITTER SAPONINS FROM THE BARK OF COLUBRINA-ELLIPTICA - H-1 AND C-13 ASSIGNMENTS BY 2D NMR-SPECTROSCOPY, Magnetic resonance in chemistry, 31(9), 1993, pp. 859-864
Citations number
16
Categorie Soggetti
Spectroscopy,Chemistry
Journal title
Magnetic resonance in chemistry → ACNP
ISSN journal
07491581
Volume
31
Issue
9
Year of publication
1993
Pages
859 - 864
Database
ISI
SICI code
0749-1581(1993)31:9<859:NBSFTB>2.0.ZU;2-P
Abstract
Three new bitter saponins, designated mabioside A, B and C, were isola ted from the bark of Colubrina elliptica and were determined to be 3-O -[alpha-JL-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl]-15-O-[beta -D- glucopyranosyl] mabiogenin, 3-O-{alpha-L-rhamnopyranosyl-(1 --> 6) -[beta-D-glucopyranosyl-(1 --> 2)]-beta-D-glucopyranosyl}mabiogenin an d 3-O-[alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranosyl]mabioge nin, respectively. The structures were elucidated by using a combinati on of 2D NMR techniques (H-H COSY, H-H DQF-COSY, RCT-COSY, C-H COSY, F LOCK, NOESY).