Gnetifolin L and O, Two Dimeric Stilbenes from Gnetum Montanum

Two new dimeric stilbenes, named gnetifolin L and gnetifolin O, were isolated from the alcoholic extract of lianas of Gnetum montanum. Their structures were elucidated mainly on the basis of spectroscopic data including 2D-NMR studies on peracetate derivatives.

小叶买麻藤中买麻藤甲素的结构研究

从小叶买麻藤[Gnetum parvifolium(Warb.)C.Y.Cheng]茎的乙酸乙酯部分得到五个成分,经理化常数测定、光谱(UV,IR,MS,~1HNMR,^(13)CNMR和2D-NMR)分析和衍生物制备,确定买麻藤甲素为一个新的2-苯基苯并呋喃类化合物,结构为2-(3′,5′-二羟基-4′-甲氧基苯基)_-3-甲氧基5-羟基苯并呋喃。另外三个鉴定为异丹叶大黄素、白黎芦醇和β-谷甾醇.还有一个化合物正在鉴定中。

A Pair of Dimeric Stilbene Epimers from Gnetum Montanum

A pair of dimeric stilbenes, gnetifolin M and gnetifolin N were isolated from the lianas of Gnetum montanum. All attempts to separate them by HPLC were unsuccessful. Their str-uctures were elucidated by the spectroscopic analysis including 2D-NMR studies on the peracetate.

买麻藤中1个新的含氮芪类化合物

目的研究买麻藤Gnetum montanum藤茎的化学成分。方法利用正相硅胶、Sephadex LH-20凝胶、中压制备液相色谱和半制备HPLC等多种柱色谱技术进行分离纯化,并综合运用ESI-MS、HR-ESI-MS、^(1)H-NMR、^(13)C-NMR、DEPT、^(1)H-^(1)H COSY、HSQC、HMBC等方法鉴定化合物的结构。结果从买麻藤藤茎的95%乙醇提取物中分离得到14个化合物,分别鉴定为(Z)-5-(2,4-二羟基-6-(4-羟基-3-甲氧基苯乙烯基)苯基)吡咯烷-2-酮(1)、银松素单甲醚(2)、3-羟基-5,4′-二甲氧基芪(3)、银松素(4)、买麻藤醇(5)、刚果买麻藤素F(6)、异丹叶大黄素(7)、闭苞买麻藤素(8)、白藜芦醇(9)、顺式-ε-葡萄素(10)、ε-葡萄素(11)、双异食用大黄苷元A(12)、顺式-射干素B(13)和小叶买麻藤素A(14)。结论化合物1为新化合物,命名为顺式买麻藤内酰胺(cis-gnetumamide),化合物3、10、13和14为首次从该植物中分离得到。