蓣知子皂甙IV的结构

从木通科木通属植物白木通Akebia trifoliata(Thunb.)Koidz.var.australis(Diels)Rehd]种子的乙醇提取物中以硅胶层析等方法得四种三萜皂甙。其中甙IV是新天然产物,命名为蓣知子皂甙IV(yuzhiziosideIV)。根据化学和光谱分析,确定甙IV的结构为3-O-β-D-吡喃木糖基-(1→2)-a-L-吡喃阿拉伯糖齐墩果酸-28-O-β-D-吡喃葡萄糖基-(1→6)-β-D-吡喃葡萄糖酯甙。另外皂甙B(I)、皂甙C(II)和皂甙D(III)为已知物。这些化合物在白木通种子中均是首次得到。

THE STRUCTURE OF YUZHIZIOSIDE IV FROM THE SEED OFAKEBLA TRIFOLLATA (THUNB.)KOIDZ.VAR AUSTRALIS

Four triterpenoid saponins were isolated from the seeds of Akebia trifoliata(thunb.)Koidz.var.australis (Diels)Rehd.Its chemical structures were elucidated by means of chemical andspectrometric analysis.One new compound(yuzhizioside IV)was elucidated as:3-O-β-D-xylopyra-nosyl-(1→2)-α-L-arabinopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl(1→6)-β-D-glucopyra-noside and the other three are known compounds:saponin B(I),saponin C(II)and saponin D(III).