A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α...A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranosyl ester on the basis of spectroscopic analysis as well as chemical methods.In addition,the structure of Fulvotomentoside A,the previously reported major saponin,was revised,and it should be 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-glucopyranosy(1→6)-β-D-glucopyranosyl ester(Decaisoside E) on the basis of careful analyses of new spectroscopical data.展开更多
文摘A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranosyl ester on the basis of spectroscopic analysis as well as chemical methods.In addition,the structure of Fulvotomentoside A,the previously reported major saponin,was revised,and it should be 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-glucopyranosy(1→6)-β-D-glucopyranosyl ester(Decaisoside E) on the basis of careful analyses of new spectroscopical data.
文摘目的:研究徐长卿(Cynanchum paniculatumBge.)中C21甾体化学成分。方法:应用多种色谱柱层析法对徐长卿的乙酸乙酯部位进行化学成分的分离,并通过波谱技术鉴定化合物的结构。结果:分离鉴定了7个C21甾体化合物,分别为3β,14-dihydroxy-14-βpregn-5-en-20-one(Ⅰ),glaucogenin C(Ⅱ),glaucogenin A(Ⅲ),glauco-genin D(Ⅳ),neocynapanogenin F(Ⅴ),glaucogenin C 3-O-β-D-thevetoside(Ⅵ),neocynapanogenin F 3-O-β-D-oleandropy-ranoside(Ⅶ)。结论:化合物Ⅲ、Ⅳ、Ⅵ为首次从该植物中分离得到。
