The NMR studies on two new furostanol saponins from Agave sisalana leaves.
The detailed NMR studies and full assignments of the 1H and 13C spectral data for two new furostanol saponins isolated from Agave sisalana leaves are described. Their structures were established using a combination of 1D and 2D NMR techniques including 1H, 13C, 1H-1H COSY, TOCSY, HSQC, HMBC and HSQC-TOCSY, and also FAB-MS spectrometry and chemical methods. The structures were established as (25S)-26-(beta-D-glucopyranosyl)-22 xi-hydroxyfurost-12-one-3beta-yl-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->3)-O-[O-beta-D-glucopyranosyl-(1-->2)]-O-beta-D-glucopyranosyl-(1-->4)-beta-D-galacto- pyranoside (1) and (25S)-26-(beta-D-glucopyranosyl)-22xi-hydroxyfurost-5-en-12-one-3beta-yl-O-alpha-L-rhamno- pyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->3)-O-[O-beta-D-glucopyranosyl-(1-->2)]-O-beta-D-glucopyranosyl- (1-->4)-beta-D-galactopyranoside (2).
Zou
Peng
P
Beijing Institute of Radiation Medicine, Beijing 100850, People's Republic of China.
Fu
Jing
J
Yu
He-shui
HS
Zhang
Jie
J
Kang
Li-ping
LP
Ma
Bai-ping
BP
Yan
Xian-zhong
XZ
D027882:Agave / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D018515:Plant Leaves / Q000737:chemistry; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D013261:Sterols / Q000737:chemistry
C522462:26-glucopyranosyl-22xi-hydroxyfurost-12-one-3-yl-O-rhamnopyranosyl-1-4-glucopyranosyl-1-3-O-(O-glucopyranosyl-1-2)-O-glucopyranosyl-1-4-galactopyranoside; C522463:26-glucopyranosyl-22xi-hydroxyfurost-5-en-12-one-3-yl-O-rhamnopyranosyl-1-4-glucopyranosyl-1-3-O-(O-glucopyranosyl-1-2)-O-glucopyranosyl-1-4-galactopyranoside; D012503:Saponins; D013261:Sterols; C041827:furostanol I