【摘 要】
：
从粗枝崖摩(Amoora dasyclada (How et T.Chen)C.Y.Wu)中分离到5个化合物.通过波谱方法鉴定为:24,25-epoxy-tirucall-7-ene-3,23-dione(1),24,25,26,27-tetranortirucall-7-e
【机 构】
：
中国科学院西北高原生物研究所,西宁,810001;中国科学院昆明植物研究所植物化学与西部植物资源持续利用国家重点实验室,昆明,650204
【基金项目】
：
国家高技术研究发展计划(863计划);中国科学院知识创新工程项目
论文部分内容阅读
从粗枝崖摩(Amoora dasyclada (How et T.Chen)C.Y.Wu)中分离到5个化合物.通过波谱方法鉴定为:24,25-epoxy-tirucall-7-ene-3,23-dione(1),24,25,26,27-tetranortirucall-7-ene-3-oxo-23(21)-lactone(2),taraxerone(3),taraxerol(4)andβ-sitosterol(5).其中化合物1为一个新的三萜,3～5为首次从该植物中分离得到.化合物2是首次从天然植物中分离得到的一个四降三萜,对它的碳谱和氢谱数据进行了全归属.此外化合物2在碳7位上的双键和14位上的甲基并未发生变化,以前文献中没有报道过与此类似的四降三萜,据此进一步讨论了四降三萜的生物合成路径.“,”Five compounds were isolated from the EtOH extraction of the stem of Amoora dasyclada (How et T. Chen) C. Y. Wu (Meliaceae). On the basis of spectroscopic methods, their structures were elucidated as 24, 25-epoxy-tirucall-7-ene-3, 23-dione (1), 24, 25, 26, 27-tetranortirucall-7-ene-3-oxo-23 (21)-lactone (2), taraxerone (3), taraxerol (4) and β-sitosterol (5). Among them, compound 1 was a new triterpenoid, compounds 3-5 were firstly obtained from this plant; compound 2, an tetranortriterpenoid,was firstly isolated from natural sources, and its NMR data were assigned for the first time. Moreover, the △7-bond and the Me-14 in compound 2 were never changed, which has never been found in other tetranortriterpenoids. And the biosynthetic pathway of tetranortriterpenoid was further discussed.
其他文献
目的 图像显著适配旨在自动调节图像尺寸,对图像内容进行非均匀缩放,以便在受限的展示空间内更好地保留显著物体.为了解决显示适配过程中显著物体部分扭曲的问题,提出一种基
目的 视觉效果评价是3维立体动画制作过程中不可忽略的一环.评价过程主要依靠专业人员的行业经验,受人员知识水平、测试环境等因素的影响.针对该问题,提出了一个主客观结合的
目的 ASAP(as-similar-as-possible)算法在处理某些图像时存在着不足,即重要区域被过分压缩,而非重要区域被拉伸得很大.为此,在该算法已有的研究基础上提出一种改进后的图像
目的 随着手持移动设备的迅猛发展和大数据时代的到来,以多媒体数据为核心的视觉搜索等研究和应用得到了广泛关注.其中局部特征描述子的压缩、存储和传输起到了举足轻重的作
Acetylcholine test has been widely used clinically in several countries as a practical test provoking coronary artery spasm.1-3 Although it has also been launch
A highly efficient total synthesis of S-(+)-tylophorine has been accomplished in fully asymmetric fashion.
Primary hepatic carcinosarcoma is defined as a malignant hepatic tumour containing both carcinomatous and sarcomatous elements. Strictly, it should be distingui
Marrow stromal cells(MSCs) have been reported to transplant into injured brain via intravenous or intraarterial or direct intracerebral administration.1-3 In th
Humanimmunodeficiencyvirustype 1(HIV 1) specificcytotoxicTlymphocytes (CTL)areconsideredtoplayacentralroleintheimmuneresponseagainstHIV 1 DuringuntreatedacuteH
Background The aim of this study was to investigate DNA content and expression of c-erbB-2, PS2, and prostate-specific antigen (PSA) proteins in breast carcino