A new spirostanol saponin, named chinenoside VI, was isolated from the bulbs of Allium chinense. On the basis of spectral data and chemical evidence, its structure was established as: 25 (R)-24-O-beta-D-glucopyranosyl...A new spirostanol saponin, named chinenoside VI, was isolated from the bulbs of Allium chinense. On the basis of spectral data and chemical evidence, its structure was established as: 25 (R)-24-O-beta-D-glucopyranosyl-3 beta, 24 beta-dihydroxy-5 alpha-spirost-3-O-alpha-L-arabinopyranosyl-(1 --> 6)-beta-D-glucopyranoside.展开更多
A new pregnane glycoside hypoglaucin G was isolated from Dioscorea collettii var. hypoglauca by bioactivity-guided fractionation, which showed a moderate activity of inducing morphological deformation of the Pyricular...A new pregnane glycoside hypoglaucin G was isolated from Dioscorea collettii var. hypoglauca by bioactivity-guided fractionation, which showed a moderate activity of inducing morphological deformation of the Pyricularia oryzae mycelia. The structure of hypoglaucin G was established as 16 beta-(4'-methyl-5'-O-beta-D-glucopyranosyl-pentanoyloxy)-pregn-5-en-3 beta-ol-20-one 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)-]-beta-D-glucopyranoside by chemical evidence and spectral analysis, especially by 2D-NMR techniques.展开更多
文摘A new spirostanol saponin, named chinenoside VI, was isolated from the bulbs of Allium chinense. On the basis of spectral data and chemical evidence, its structure was established as: 25 (R)-24-O-beta-D-glucopyranosyl-3 beta, 24 beta-dihydroxy-5 alpha-spirost-3-O-alpha-L-arabinopyranosyl-(1 --> 6)-beta-D-glucopyranoside.
文摘A new pregnane glycoside hypoglaucin G was isolated from Dioscorea collettii var. hypoglauca by bioactivity-guided fractionation, which showed a moderate activity of inducing morphological deformation of the Pyricularia oryzae mycelia. The structure of hypoglaucin G was established as 16 beta-(4'-methyl-5'-O-beta-D-glucopyranosyl-pentanoyloxy)-pregn-5-en-3 beta-ol-20-one 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)-]-beta-D-glucopyranoside by chemical evidence and spectral analysis, especially by 2D-NMR techniques.
