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1.
The hydrogenation of the natural sesquiterpene lactone leucomisin has been investigated; a nontrivial procedure for the qualitative and quantitative analysis of the reaction products by the HPLC method has been developed.Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 73–78, January–February, 1995. Original article submitted October 18, 1994. 相似文献
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R. I. Dzhalmakhanbetova M. A. Rodichev Yu. V. Gatilov M. M. Shakirov G. A. Atazhanova S. M. Adekenov 《Chemistry of Natural Compounds》2009,45(4):503-506
Epoxy derivatives of the sesquiterpene lactones ludartin and tourneforin were synthesized. Their structures were elucidated
using spectral data and x-ray structure analysis. 相似文献
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Sh. Z. Kasymov 《Chemistry of Natural Compounds》1982,18(5):519-537
The paper gives a review of the chemistry of natural sesquiterpene lactones. 相似文献
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Absinthin, a constituent of . , has been given structure . 相似文献
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Two new sesquiterpene lactones, 1β,15-diacetoxy-5,7α,6,11β(H)-eudesm-3,4-en-6,12-olide (1) and 1β-hydroxy-3,4-en-15-O-β-glucopyranosyl-5,7α,6,11β(H)-eudesman-6,12-olide (2), were isolated from Sonchus arvensis L. (Asteraceae), together with ten known compounds. Their structures were elucidated through spectroscopic and chemical methods.
All these known compounds except oleanolic acid (11) were isolated from the genus Sonchus for the first time. Selected new compounds were evaluated for antibacterial activity; unfortunately, they showed weak or
no activities against Streptococcus mutans ATCC 25175. 相似文献
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K. S. Rybalko M. N. Mukhametzhanov V. I. Sheichenko O. A. Konovalova 《Chemistry of Natural Compounds》1977,12(4):412-415
Summary From the epigeal part ofStizolophus balsamita (Lam.) Cass. ex Takht. a new sesquiterpene lactone balsamin has been isolated with the composition C20H26O6, mp 242–244°C (from ethanol), []
D
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–45.70° (c 1.9; chloroform). Do the basis of the basis of the IR, UV, and PMR spectra of balsamin and its acetate, a stereochemical structure has been proposed for balsamin, and the structures of stizolin and stizolicin isolated previously from the same plant have also been supplemented by stereochemistry.All-Union Scientific-Research Institute of Medicinal Plants, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 467–472, July–August, 1976. 相似文献
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The structures of two new sesquiterpene lactones, 11,13beta-dihydroixerin Z (1) and Ixerin Z2 (2) isolated from Ixeris sonchifolia were determined to be 3-hydroxy-1(10),3-guaiadiene-12,6-olide-2-one-3-O-beta-D-glucopyranoside and 1(10),3,11 (13)-guaiatriene-12,6-olide-2-one-3-O-[6'-(4"-hydroxybenzyl lactyl)]-beta-D-glucopyranoside, respectively on the basis of detailed spectral analysis. 相似文献
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Two new sesquiterpene lactones from Ixeris chinensis 总被引:1,自引:0,他引:1
Phytochemical investigation of Ixeris chinensis NAKAI (Asteraceae) has resulted in the isolation of a new guaianolide-type sesquiterpene lactone, ixerochinolide (1) as well as the related glucoside, ixerochinoside (2). In addition, the known guaianolides, 8beta-hydroxy-3-oxo-guaia-4(15),10(14),11(13)-trien-1alpha,5alpha,6beta,7alphaH-12,6-olide (8beta-hydroxydehydrozaluzanin), 8beta,15-dihydroxy-2-oxo-guaia-1(10),3,11(13)-trien-5alpha,6beta,7alphaH-12,6-olide (lactucin), 3beta,8alpha,10alpha-trihydroxy-guaia-4(15),11(13)-dien-1alpha,5alpha,6beta,7alphaH-12,6-olide (10alpha-hydroxy-10,14-dihydro-desacylcynaropicrin) and 3beta-D-glucopyranosyloxy-8beta-(p-hydroxyphenylacetyloxy)-guaia-4(15),10(14),11(13)-trien-1alpha,5alpha,6beta,7alphaH-12,6-olide (8-epicrepioside) were identified. The structures were determined on the basis of spectral analyses, especially 1- and 2D NMR. Compound 1 exhibited significant cytotoxicity against human PC-3 tumor cells. 相似文献
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The structure of 1(10)Z,4Z-germacranolides was studied by the method of molecular mechanics. Possible conformers, the probability of their existence,
and barriers to conformational transitions were determined.
For Part 1, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 268–271, February, 1997. 相似文献
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Summary It has been established that the substance isolated previously fromInula germanica L. is a mixture of two new sesquiterpene lactones: germanin A and germanin B.On the basis of chemical reactions and a study of IR, UV, NMR, and mass spectra, structures (I) and (XVI), respectively, are proposed for germanin A and germanin B.All-Union Scientific-Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 578–589, September–October, 1974. 相似文献
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Chea A Hout S Long C Marcourt L Faure R Azas N Elias R 《Chemical & pharmaceutical bulletin》2006,54(10):1437-1439
Two new sesquiterpene lactones, vernolides C and D as well as six known ones were isolated from the dichloromethane fraction of an aqueous extract from Vernonia cinerea. Their structures were elucidated by spectroscopic methods. Among the known sesquiterpene lactones, three of them were described in this plant for the first time. In vitro antiplasmodial evaluation showed that the three major compounds 1, 7 and 8 were active against chloroquine resistant Plasmodium falciparum strain (W2) with IC(50) 3.9, 3.7 and 3.5 microM, respectively. 相似文献
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Chemistry of Natural Compounds - It has been established that the substance isolated previously fromInula germanica L. is a mixture of two new sesquiterpene lactones: germanin A and germanin B. On... 相似文献
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Tabopda TK Ngoupayo J Liu J Shaiq Ali M Khan SN Ngadjui BT Luu B 《Chemical & pharmaceutical bulletin》2008,56(2):231-233
Three new sesquiterpene lactones, (4betaH)-5alpha-hydroxy-8alpha-(2-methylbut-2-enoyloxy)-2-oxo-1(10),11(13)-guaiadien-12,6alpha-olide (1), (4betaH)-8alpha-(2-methylbut-2-enoyloxy)-2-oxo-1(5),10(14),11(13)-guaiatrien-12,6alpha-olide (2) and 2,5-epoxy-2beta-hydroxy-4alpha-methoxy-8alpha-(2-methylbut-2-enoyloxy)-4(15),10(14),11(13)-germacratrien-12,6alpha-olide (3), have been isolated from roots and stems of Elephantopus mollis together with two known sesquiterpene lactones (4, 5). The identification of the isolates was accomplished by spectroscopic methods. Compounds (1-5) exhibited significant cytotoxic activities against mouse neuroblastoma B104 cells. 相似文献
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[structure: see text] [structure: see text] Sesquiterpene lactones, ligulolide A (1) and 6beta,8alpha-dihydroxy-1-oxoeremophila-7(11),9(10)-diene-12,8-olide (2), were isolated from Ligularia virgaurea spp. oligocephala. Their structures were established by analysis of one- and two-dimensional NMR data. The relative stereostructures were determined on the basis of NOESY and single-crystal X-ray experiments. 1 represents a novel sesquiterpene carbon framework, and a possible biosynthetic process is proposed. 2 is a novel eremophilane-type sesquiterpene. 相似文献
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Two new sesquiterpene lactones — gaigranin and gaigrandin — have been isolated from the epigeal part ofGaillardia grandiflora, and their structures have been established on the basis of spectral (IR, PMR,13C NMR, and mass) characteristics and x-ray structural analysis.Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 79–85, January–February, 1995. Original article submitted October 7, 1994. 相似文献
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A. G. Berdin S. M. Adekenov V. A. Raldugin M. M. Shakirov A. G. Druganov A. T. Kulyyasov G. A. Tolstikov 《Russian Chemical Bulletin》1999,48(10):1987-1991
Two new crystalline guaianolides,viz., rhaposerine and rhaserolide, were isolated from an ethanolic extract of the above-ground part of the plantRhaponticum serratuloides by column chromatography along with sesquiterpene lactones,viz., centaurepensin and acroptilin, which have been found in other plants. The chemical structures of the title lactones were
established by1H and13C NMR spectroscopy and 2D1H−1H (COSY) and13C−1H (COSY and COLOC) NMR spectroscopy.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2010–2014, October, 1999. 相似文献
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Chemistry of Natural Compounds - 相似文献