排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
线叶旋复花化学成分的研究 总被引:2,自引:0,他引:2
1964年我们从菊科植物线叶旋复花(Inula linariaefolia Turcz)中提得一个新的倍半萜内酯,药理试验表明具有明显的抗肿瘤Hela细胞、祛痰、抑制霉菌等活性。通过波谱分析并结合早期的化学工作,现已确定它即为同属植物I.britannica中分得的britanin,但britanin的立体结构尚未见报道。根据~1HNMR以及其衍生物的旋光谱的研究,推定britanin的立体结构应为ambros ll(13)-en-2β,4β,6α,8α-tetraol-12-oic-(12,8)-lactone,26-aiacetate(7),分子中的七元环则以椅式构象存在。此外,还鉴定了同一植物中分得的另成分为蒲公英醇软脂酸酯(taraxasteryl palmitate)。 相似文献
2.
3.
线叶旋复花化学成份的研究 总被引:1,自引:0,他引:1
Xian-Ye-Xuan-Fu-Hua, the flowers of Inula linariaefolia Turcz (Compositae), is a commonly known Chinese medicinal herb and used as expectorant as well as for the treatment of some malignant tumors. The chemical investigation of its active principles by our early work in 1964 resulted in the isolation of a new sesquiterpene lactone (m.p. 190-192`C, (α)D-24 in CHCl3), which possesses significant inhibitory action against Hela cells and fungi in vitro. Besides, it also shows some expectorant activity in preliminary pharmacological tests. Analyses of the spectral data (IR, UV, ^1H NMR, 13C NMR, MS) and our early results of chemical reactions suggested that the compound is the same as britanin 1 (m.p. 192-194`C, (α)D-26 in CHCl3) studied Chugunov in 1971. However its stereochemistry remained unsolved. On careful examination of the 360 MHZ 1H NMR data (in CDCl3 and in C6D6) and the Cotton effects of ORD spectra of its saturated lactone and cyclopentanone derivatives, we considered that britanin must be ambros-11(13)-en-2β, 4β, 6α, 8α-tetraol-12-oic-(12,8)- lactone, 2, 6-diacetate (7). Since the large values for J6,7, J7,8, J8,9, J9,10 and J1,10 indicate the existence of successive a-a trans coupling in all vicinal protons form C6 to C1, the cofnformation of the cycloheptane ring must be in chair from. The other constitutent isolated from the same plant has been identified as taraxasteryl palmitate. 相似文献
4.
1