蓣知子的化学成分研究──Ⅰ.白木通种子中的3位单糖链皂甙化合物

Studies on the Chemical Components of Chinese Drug Yuzhizi Ⅰ.Hederagenin 3-O-Glycosides of the seeds of Austral Akebia (Akebia trifoliata var.australis)

蓣知子为木通科木通属植物木通、三叶木通、白木通的种子。自白木通Akebiatrifoliata（Thunb．）Koidz．var．austrais（Diels）Rehd．的种子中首次分出2种3位单糖链皂甙化合物，经1HNMR、13CNMR、2DNMR、结合水解等方法鉴定了它们的结构。Ⅰ为常春藤皂甙元3-O-β--D-吡喃木糖-（1→2）-α-L-吡喃阿拉伯糖甙（即saponinB）；Ⅱ为常寿藤皂甙元-3-O-β-D-吡喃葡萄糖-（1→2）-α-L-吡喃阿拉伯糖甙（即saponinC）。

Yuzhizi is the seed of Akebia quinata (Thunb. ), A. trifoliota (Thunb.) Koidz. and A.trifoliata(Thunb.) Koidz. var. australis(Diels) Rehd.Two triterpenoid saponins of hederagenin 3-O-glycosides have been isolated from the seeds of A. trijoliata (Thunb.) Koidz.var.australis (Diels) Rehd. for the first time. They were idcntified by spectroscopic(EI-MS, FABMS, 1H, 13CNMR and 2 DNMR) and chemical methods (acid/base hydrolysis) as Ⅰ:3-O-β-D-xylo-pyranosyl-(1-2)-α-L-arabinopyranoside hederagenin (saponin B); Ⅱ: hederagenin 3-O-β-D-glucopyranosyl-(1-2)-α-L-arabinopyranoside (saponin C).