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1.
From the aerial parts of Xanthium indicum, in addition to known compounds, two new xanthanolides were isolated and the stereochemistry of xanthumin  相似文献   

2.
The aerial parts of Xanthium orientale afforded an isomer of xanthanol.  相似文献   

3.
The re-investigation of the aerial parts of Telekia speciosa afforded five new sesquiterpene lactones, two eudesmanolides and three xanthanolides, all closely related to those isolated before from this species or from related genera. The structures were elucidated by 1H NMR spectroscopy.  相似文献   

4.
Four populations of Parthenium tomentosum var. tomentosum were examinated. In addition to the known lactones, ivalbatine, acetyl ivalbatine, parthomentine, incanine and ligulatine C, three new pseudoguaianolides: 4-O-desacetyl ligulatine C; 1-dehydroperuvinine and parthoximentine were also isolated. Chemical and spectroscopic methods were used for their structural determination.  相似文献   

5.
The investigation of three South African Vernonia species afforded minute amounts of five new glaucolides, two monoepoxides and three diepoxides. The structures were elucidated by 1H NMR spectroscopy. The roots of Vernonia sutherlandii contain, in addition to vernonataloide, bergamotene and santalene, minute amounts of the corresponding acetoxy derivatives.  相似文献   

6.
7.
Cynaropicrin and 11,13-dihydrodesacylcynaropicrin were isolated from Tricholepis glaberrima.  相似文献   

8.
Sevil Oksuz  Ersan Putun 《Phytochemistry》1983,22(11):2615-2616
The aerial parts of Centaurea kotschyi (var. kotschyi) afforded, besides three known sesquiterpene lactones, a new derivative of linichlorin B.  相似文献   

9.
Re-investigation of the aerial parts of Schkuhria pinnata afforded in addition to the heliangolides isolated previously a new one, the structure of  相似文献   

10.
Three eudesmanolides of Pluchea rosea were found to be structurally related to the eudesmane, cuauthemone, earlier reported from plants of the same genus.  相似文献   

11.
Five sesquiterpene lactones were isolated from Ainsliaea fragrans, two of them being new.  相似文献   

12.
The roots of Elephantopus carolinianus afforded two guaianolides as well as two known elephantopin derivatives which were the main constituents of the aerial parts.  相似文献   

13.
The investigation of four Taeckholmia species afforded in addition to known desacylcynaropicrin, two new guaianolides. The structures were elucidated by spectroscopic methods and chemical transformations. The chemotaxonomy is discussed briefly.  相似文献   

14.
The aerial parts of Centaurea behen afforded in addition to known lactones a new derivative of solstitialin A.  相似文献   

15.
The roots of Cichorium pumilum afforded two new guaianolides, 10β-hydroxyguaia-4,13-dien-6,12-olide and the corresponding 11β,13-dihydro derivative which could be separated only after transforming the methylene lactone into the corresponding pyrazoline. The structures were elucidated by 400 MHz 1H NMR spectroscopy. The chemotaxonomic situation is discussed briefly.  相似文献   

16.
Calea angusta afforded, in addition to known compounds, two new furanoheliangolides closely related to those of Calea pilosa.  相似文献   

17.
Six sesquiterpene lactones were isolated from the aerial parts of Ambrosia maritima. Four pseudoguaianolides were isolated for the first time in addition to parthenin and neoambrosin.  相似文献   

18.
The investigation of the aerial parts of a variety of Enhydra fluctuans afforded in addition to 4-hydroxyfarnesyl acetate and fluctuadin five new melampolides elucidated by high field 1H NMR spectroscopy. The chemotaxonomic situation is discussed briefly.  相似文献   

19.
The aerial parts of Stevia isomeca afforded, in addition to known compounds, four new sesquiterpene lactones, three pseudoguaianolides related to stevin and a xanthanolide. The structures were elucidated by spectroscopic methods and a few chemical transformations.  相似文献   

20.
A reinvestigation of the aerial parts of Wedelia grandiflora showed that the described lactones also are steiractinolides. 6α-Angeloyloxy-1α-hydroxysteiractinolide has not been isolated previously.  相似文献   

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