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1.
The aerial parts of Piptolepis ericoides afforded in addition to known compounds two new germacranolides, a zexbrevanolide and piptolepolide, tentatively characterized as a germacranolide with a trans-disubstituted double bond. From the aerial parts of two Vanillosmopis species in addition to goyazensolide, a new isomer with an exocyclic double bond was isolated. 相似文献
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Ferdinand Bohlmann Christa Zdero Harold Robinson Robert M. King 《Phytochemistry》1982,21(5):1087-1091
The investigation of three further Lychnophora species and the re-investigation of one species afforded, in addition to known compounds, seven new sesquiterpene lactones all being closely related to those isolated before from the subtribe Lychnophorinae. Furthermore, a new bisabolene diketone was present in one species. The structures were elucidated by spectroscopic methods. The chemotaxonomic situation of the genus is briefly discussed. 相似文献
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Ferdinand Bohlmann Michael Wallmeyer Robert M. King Harold Robinson 《Phytochemistry》1982,21(6):1439-1441
Piptolepis leptospermoides afforded, in addition to known compounds, a new eremanthanolide and a germacranolide closely related to piptolepolide. 相似文献
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An investigation of the aerial parts of Dicoma tomentosa afforded four new germacranolides and four melampolides together with urospermal A and its 11β,13-dihydroderivative. The structures were elucidated by spectroscopic methods. The chemotaxonomic situation is discussed briefly. 相似文献
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The aerial parts of Eupatoriastrum nelsonii afforded, in addition to known sesquiterpene lactones, four new lactones all closely related to the germacranolides isolated previously from other genera of the tribe Eupatorieae. The structures were elucidated by spectroscopic methods. Chemotaxonomic aspects are discussed briefly. 相似文献
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Ferdinand Bohlmann Rajinder K. Gupta Jasmin Jakupovic Harold Robinson Robert M. King 《Phytochemistry》1981,20(7):1609-1612
The re-investigation of Eremanthus glomerulatus afforded three new germacranolides and a guaianolide, while from E. mollis two known furanoheliangolides and a new phenylpropanol derivative were isolated. The germacranolides most probably are precursors of the widespread glaucolides. The structures were elucidated by spectroscopic methods. The chemotaxonomic situation is discussed briefly. 相似文献
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Mikania grazielae afforded two new germacranolides which were identified as 2α-acetoxyeupatolide and 2α-acetoxylaurenobiolide. 相似文献
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The aerial parts of Perymenium klattianum afforded, in addition to kaurane and beyerane derivatives, three germacranolides, two of them isolated for the first time. The structures were elucidated by spectroscopic methods and by some chemical transformations, which in part gave unusual products. Perymeniopsis ovalifolia gave known compounds only. 相似文献
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The isolation is reported of the new germacrolide, 11,13-dehydroeriolin, the new melampolide schkuhrioidin and schkuhriolide from Schkuhria schkuhrioides. 11,13-Dehydroeriolin is also a constituent of S. virgata. The structure and stereochemistry of the new compounds were established on chemical and spectroscopic grounds. 相似文献
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Proteopsis argentea (tribe Vernonieae) afforded in addition to known compounds three new sesquiterpene lactones, closely related to those isolated from Eremanthus species, indicating a close relationship between these genera. 相似文献
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Ferdinand Bohlmann Kazuyasu Umemoto Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1984,23(8):1669-1672
The investigation of two Ferreyanthus species afforded seven germacranolides which have not been isolated previously. Two derivatives of linalol were also present. The structures were elucidated by spectroscopic methods. Chemotaxonomic relationships are briefly discussed. 相似文献
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The investigation of two Brachylaena species afforded in addition to known sesquiterpene lactones and other constituents five new lactones, a germacranolide, a guaianolide and three eudesmanolides. The structures were elucidated by spectroscopic methods. The chemotaxonomy of this complex genus is discussed. 相似文献
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Pseudostifftia kingii afforded several guaianolides, two of them not isolated before. 相似文献
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Desacetyleupaserrin, eupaserrin and two new germacranolides, mollisorin-A and mollisorin-B, were isolated from H. mollis. 1H NMR and 13C NMR data and chemical interconversions of the four germacranolides are described. 相似文献
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The aerial parts of Inula heterolepis afforded two new germacranolides and a new eudesmanolide, all closely related to haageanolide, which was also isolated. 相似文献
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The aerial parts of Calea clematidea gave three new germacranolides, those of Viguiera procumbens two orizabin derivatives and those of V. linearis dihydrobudlein A. In addition to these lactones, several known ones were isolated. 相似文献
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Dittrichia viscosa afforded, in addition to known compounds, minute amounts of nine sesquiterpene lactones, all closely related to ineupatorolide B 相似文献
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Ferdinand Bohlmann Rajinder K. Gupta Robert M.^King Harold Robinson 《Phytochemistry》1982,21(10):2593-2595
Calea villosa afforded three new sesquiterpene lactones, two furanoheliangolides and an epoxy- germacranolide, as well as several known compounds. The structures were elucidated by spectroscopic methods. 相似文献