异叶梁王茶甙Ⅲ和Ⅳ的结构

继前报后,又从异叶梁王茶[Nothopanax davidii(France)Harms]树皮中分离得到两种五环三萜皂甙。经化学和波谱(IR,¹HNMR,~(13)CHMR,¹H-¹HCOSY,¹³C-¹H COSY,MS)分析,分别鉴定为3-O-α-(2’,4’-O-二乙酰基)-L-吡喃阿拉伯糖-3β-羟基齐墩果-12-烯-28,29-双羧酸-28-O-[α-L-吡喃鼠李糖(1-4)-β-D-吡喃葡萄糖(1—6)-β-D-吡喃葡萄糖]酯甙(Ⅲ),命名为异叶梁王茶甙Ⅲ和3-O-β-(2-O-乙酰基)-D-吡喃木糖-3β-羟齐墩果-12-烯-28,29-双羧酸甙(Ⅳ),命名为异叶梁王茶甙Ⅳ。这两种皂甙均系首次从植物中分出的新化合物。

The structures of yiyeliangwanoside III and IV from the bark of Nothopanax davidii (France) Harms]

Two new oleanane type triterpene glycosides, named Yiyeliangwanoside III and IV, were isolated from Nothopanax davidii (France)Harms (Araliaceae). Their chemical structures were elucidated by means of chemical and spectrometric analysis. Yiyeliangwanoside III: C57H88O25, a white powder, mp 206-210 degrees C (dec.), [alpha]D + 2.73 (c 0.1, CH3OH). Its structure was determined as 3-O-alpha (2',4'-O-diacetyl)-L-arabinopyranosyl-3 beta-hydroxyolean-12-ene-28.29- dioicacid-28-O-[alpha-L-rhamnopyranosyl-(1-4)-beta-D-glucopyranosy l-(1-6)- beta-D-glucopyranosyl] ester. Yiyeliangwanoside IV: C37H56O10, a white powder, mp 267-170 degrees C (dec.), [alpha]20D + 31.55 degrees (c 0.1, CH3OH). Its structure was determined as 3-O-alpha-(2'-O-acetyl)-D-xylopyranosyl-3 beta-hydroxyolean-12-ene-28.29-dioic acid.