排序方式: 共有31条查询结果,搜索用时 15 毫秒
1.
Shuang‐Jun Lin Chang‐Heng Tan Shan‐Hao Jiang Yi‐Ming Li Da‐Yuan Zhu 《Helvetica chimica acta》2006,89(11):2789-2793
Four new iridoids, buergerinins B–E ( 1 – 4 ), along with three known iridoids, were isolated from the roots of Scrophularia buergeriana. Their structures were identified on the basis of spectroscopic analysis. 相似文献
2.
Midde SreekanthGavinolla Pranitha Bharatam JagadeeshTushar Kanti Chakraborty 《Tetrahedron letters》2011,52(14):1709-1712
Stereoselective construction of highly substituted five-membered carbocycles with multiple chiral centres is described. Sharpless kinetic resolution was applied as the key step to prepare the required 2,3-epoxy alcohols and a Ti(III) radical mediated opening of the epoxide ring followed by intramolecular trapping of the generated radical with a suitably placed α,β-unsaturated ester resulted in the formation of five-membered carbocycles with up to three consecutive new chiral centres stereoselectively fixed. 相似文献
3.
Bo Ding Wei‐Wei Ma Yi Dai Hao Gao Yang Yu Ye Tao Yi Zhong Xin‐Sheng Yao 《Helvetica chimica acta》2010,93(12):2488-2494
Two new iridoids, 10‐O‐benzoyl‐6′‐O‐α‐L ‐arabino(1→6)‐β‐D ‐glucopyranosylgeniposidic acid ( 1 ), deacetyl‐6‐ethoxyasperulosidic acid methyl ester ( 2 ), along with 14 other known iridoids, were isolated from the whole plant of Hedyotis diffusa Willd. Their structures were determined on the basis of spectroscopic analysis. The short‐term‐memory‐enhancement activities of compounds 1, 7 – 9, 11 , and 13 were evaluated on an Aβ transgenic drosophila model. 相似文献
4.
Ya‐Zhu Zhu Yan‐Hong Li Dan Liu Ling‐Huan Gao Hong‐Mei Li Rong‐Tao Li 《Helvetica chimica acta》2015,98(8):1132-1140
Four new iridoids, incarvoids D–F ( 1 – 3 , resp.) and incarvoid B 9‐O‐β‐D ‐glucopyranoside ( 4 ), and one new monoterpenoid, argutoid B ( 5 ), along with 14 known compounds, were isolated from Rhododendron microphyton. Their structures were established by comprehensive 1D‐ and 2D‐NMR spectroscopic analysis. 相似文献
5.
A new iridoid, torrilliolide ( 1 ), and a new pyridine alkaloid, torricelline ( 2 ), were isolated from the stem barks of Torricellia tiliifolia. Their structures were determined by analysis of their spectroscopic data. Both compounds exhibited cytotoxicity against Spodoptera litura cell line. 相似文献
6.
《光谱学快报》2013,46(6):587-605
Abstract A procedure is presented that utilizes 1H NMR for prediction of the skeleton of iridoids. A new program was developed, named H1MACH, that presents a database with 800 data points from the 1H NMR spectra of iridoids. This program was widely tested for the prediction of the skeleton of 40 compounds and compared with other programs in the expert system SISTEMAT. The results obtained show that H1MACH is very useful for the prediction of the skeleton of iridoids, especially for the iridane skeleton. 相似文献
7.
Vinicius F. Moreira Rodrigo R. Oliveira Leda Mathias Raimundo Braz‐Filho Ivo J. Curcino Vieira 《Helvetica chimica acta》2010,93(9):1751-1757
A phytochemical study on Borreria verticillata has led to the isolation of two novel simple indole alkaloids, 6‐methoxy‐4‐(3‐methylbut‐2‐en‐1‐yl)‐1H‐indole, named verticillatine A ( 1 ), and 1‐(1H‐indol‐6‐yl)‐3‐methylbutan‐1‐one, named verticillatine B ( 2 ), one new iridoid, 6′‐O‐(2‐glyceryl)scandoside methyl ester ( 3 ), with the glycerol unit linked to a glucose unit, and two known ones, asperuloside ( 4 ) and scandoside methyl ester ( 5 ). The structures of these compounds were elucidated on the basis of spectroscopic‐data analyses, mainly 1H‐ and 13C‐NMR, including 2D experiments (1H,1H‐COSY, NOESY, HMBC, and HMQC), and HR‐ESI‐MS. 相似文献
8.
Serge Michalet Laëtitia Payen‐Fattaccioli Chantal Beney Pascale Cégiéla Christine Bayet Gilbert Cartier Diderot Noungoué‐Tchamo Etienne Tsamo Anne‐Marie Mariotte Marie‐Geneviève Dijoux‐Franca 《Helvetica chimica acta》2008,91(6):1106-1117
Phytochemical investigation of barks of Christiana africana led to the identification of cyclopeptide alkaloids, flavonoids, coumarinolignans, iridoids, sesquiterpenoids, and triterpenes. This plant was classified so far in the Tiliaceae family. This study was started while the genomic study of numerous specimens was described in order to establish new criteria for Malvales botanical classification. In the present work, twenty components were identified, belonging to the three major classes of secondary metabolites: alkaloids, phenols, and terpenes. In the first class, cyclopeptides are well‐known compounds in Rhamnaceae and Sterculiaceae. Their presence in Malvaceae (in APG2 sensus) suggests a possible chemical link between the ex‐Tiliaceae and the Malvaceae. 相似文献
9.
高效液相色谱-质谱法测定杜仲样品中环烯醚萜含量 总被引:2,自引:0,他引:2
建立了液相色潜-质谱联用测定不同杜仲样品中3种环烯醚萜类物质含量的方法。以50%的甲醇-水为溶剂采用超声波提取样品中的环烯醚萜类物质.采用选择离子方式(SIR),以丰度最高的[M+Na]^+特征离子作为监测离子进行定性和定量分析。其质荷比(m/z)分别为369(桃叶珊瑚甙,AU)、397(京尼平甙酸,GPA)和411(京尼平甙,GP)。方法的线性范围分别为AU:0.11~1.10μg,GPA:0.24—2.40μg,GP:0.31-4.65μg;相关系数r分别为:0.999,0.999,0.996。检出限依次为0.3、0.4、0.3ng;进行4次平行测定,平均回收率分别为98%、100%和95%,RSD分别为2.8%、3.1%和2.9%。该方法操作简便,重复性好,专属性强,准确可靠,适用于对复杂的天然产物样品的定性和定量分析。 相似文献
10.
Xing‐De Wu Lei Wang Juan He Xing‐Yao Li Liao‐Bin Dong Xun Gong Xiu Gao Liu‐Dong Song Yan Li Li‐Yan Peng Qin‐Shi Zhao 《Helvetica chimica acta》2013,96(12):2207-2213
Two new indole alkaloids, 5‐oxodolichantoside ( 1 ) and deglycocadambine ( 2 ), were isolated from the twigs and leaves of Emmenopterys henryi, together with four known indole alkaloids and five known iridoids. The structures of the new compounds were elucidated on the basis of extensive spectroscopic analyses, including 1D‐ and 2D‐NMR experiments, and confirmed by single‐crystal X‐ray diffraction studies. This is the first report on the isolation of indole alkaloids from this species. The indole alkaloids were evaluated for their cytotoxic activities against five human cancer lines. 相似文献