小花盾叶薯蓣中的甾体成分

目的研究小花盾叶薯蓣的化学成分。方法运用正相和反相硅胶柱色谱对其化学成分进行分离，用IR，NMR，MS等方法进行结构鉴定。结果从乙醇提取物中分离鉴定出11个甾体化合物，分别鉴定为去酰百合皂苷(deacylbrownioside，I)、薯蓣皂苷元-双葡糖苷(diosgenin-diglucoside，II)、前薯蓣皂苷A(prosapogenin A of dioscin，III)、薯蓣皂苷(dioscin，IV)、三角薯蓣皂苷宁(deltonin，V)、三角薯蓣皂苷(deltoside，VI)、甲基三角薯蓣皂苷(methyl deltoside，VII)、薯蓣皂苷元 3-O-β-D-吡喃葡糖基-(1→3)- β -D-吡喃葡糖基-(1→4)-［ α-L-吡喃鼠李糖基-(1→2)］- β -D-吡喃葡糖苷{diosgenin 3-O-β-D-glucopyranosyl-(1→3)- β -D-glucopyranosyl-(1→4)- ［α-L-rhamnopyranosyl-(1→2)］- β -D-glucopyranoside，VIII}、小花盾叶薯蓣苷(parvifloside，IX)、甲基小花盾叶薯蓣苷(methyl parvifloside，X)、薯蓣皂苷元(diosgenin，XI)、以及β-谷甾醇(β-sitosterol)和豆甾醇(stigmasterol)的混合物。结论化合物X为一新化合物，VII与X分别为VI和IX的甲醚衍生物，可能为分离过程中所产生。I系首次从薯蓣属植物中分离得到，II和IV均为首次从小花盾叶薯蓣中分离得到。

Steroidal constituents from Dioscorea parviflora

AIM: To study the chemical constituents of Dioscorea parviflora. METHODS: The chemical constituents were isolated by silica gel and RP-18 column chromatography, and their chemical structures were elucidated by IR, NMR and MS. RESULTS: Eleven steroides have been isolated from EtOH extract of Dioscorea parviflora and identified as isonarthogenin 3-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranoside (I), diosgenin-diglucoside (II), prosapogenin A of dioscin (III), dioscin (IV), deltonin (V), deltoside (VI), methyl deltoside (VII), diosgenin 3-O-beta-D-glucopyranosyl (1-->3)-beta-D-glucopyranosyl-(1-->4)-alpha-L-rhamnopyranosyl-(1-->2)]-beta-D-glucopyranoside (VIII), parvifloside (IX), methyl parvifloside (X), diosgenin (XI), and a mixture of beta-sitosterol and stigmasterol. CONCLUSION: Compound X is a new compound. Compounds VII and X were methyl ethers of VI and IX, respectively, and may be produced during isolation. Compound I is isolated from Dioscorea L., and II, IV from Dioscorea parviflora for the first time.