黄毛忽木皂甙A的分离和结构测定

ISOLATON AND STRUCTURAL ELUCIDATON OF ARADECOSIDE A FROM THE ROOT OF ARALIA DECAISNEANA

黄毛木（ＡｒａｌｉａｄｅｃａｉｓｎｅａｎａＨａｎｃｅ）为五加科木属植物。从其根的甲醇提取物中分离得到一个皂甙化合物（Ｉ），根据光谱（ＩＲ，１ＨＮＭＲ，１３ＣＮＭＲ，ＭＳ，Ｌｏｎｇｒａｎｇｅ１Ｈ－１ＨＣＯＳＹ和１Ｈ－１３ｃＨＥＴＣＯＲ）解析和化学反应（酸水解，乙酰化和碱水解）证明，化合物１的结构确定为３－Ｏ－［β－Ｄ－吡喃木糖１→３）］－β－Ｄ－吡喃葡萄糖（１→２）－β－Ｄ－吡喃葡萄糖－２８－Ｏ－β－Ｄ－吡喃葡萄糖（１→６）－β－Ｄ－吡喃葡萄糖酯甙。该化合物是一个新的三萜皂甙，命名为黄毛木皂甙Ａ（ａｒａｄｅｃｏｓｉｄｅＡ）。

A new triterpenoid saponin,C59H96O27 ,named Aradecoside A(I),was isolatedfrom the root of Aralia decaisneana Hance(Araliaceae).The determination of its structure was based onspectroscopic analysis( IR, 1HNMR,13CNMR ,MS,Long-range 1H-1HCOSY or1H-13C HETCOR)of the natural compound and its derivatives,and characterized as 3-O-[β-D-xylo-pyranosyl(1→3)]- β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl-oleanolic acid-28-O-β -D-glucopyranosyl(1→6)-β-D-glucoDyrandsyl ester.