共查询到20条相似文献,搜索用时 15 毫秒
1.
Two subspecies of Dicoma anomala afforded, in addition to known compounds, an eudesmanolide, a guaianolide and four germacranolides, the latter being closely related 8, 12-lactones. D. schinzii gave three new germacranolides and D. zeyheri a pair of isomeric acetylenic compounds. The structures were elucidated by highfield 1H NMR spectroscopy. The chemotaxonomic situation of this genus is discussed briefly. 相似文献
2.
The aerial parts of Tithionia rotundifolia afforded, in addition to two known sesquiterpene lactones, eleven new ones, seven germacranolides and four eudesmanolides. The structures were determined by 1H NMR spectroscopy. 相似文献
3.
Ferdinand Bohlmann Alfons Adler Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1982,21(6):1349-1355
The investigation of two Mikania species, both previously placed in the genus Kanimia, afforded in addition to known compounds several new germ 相似文献
4.
Dittrichia viscosa afforded, in addition to known compounds, minute amounts of nine sesquiterpene lactones, all closely related to ineupatorolide B 相似文献
5.
Zeinab Mahmoud Sawsan El-Masry Masouda Amer Jürgen Ziesche Ferdinand Bohlmann 《Phytochemistry》1983,22(5):1290-1291
The aerial parts of Sonchus macrocarpus afforded, in addition to known triterpenes, two new eudesmanolides. 相似文献
6.
Xorge A. Dominguez Raul Franco Geronimo Cano Romelia Villarreal Maringanti Bapuji Ferdinand Bohlmann 《Phytochemistry》1981,20(9):2297-2298
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
7.
Ferdinand Bohlmann Jasmin Jakupovic Maniruddin Ahmed Angelica Schuster 《Phytochemistry》1983,22(7):1623-1636
From four Schistostephium species, in addition to known compounds, 43 new ones were isolated, three isocomene, two bisabolene, two eudesmane, two allo-himachalene and two nerolidol derivatives, two sesquiterpenes with a new carbon skeleton derived from isocomene, nine eudesmanolides, 20 6,12- and 8,12-germacranolides respectively, and a prostaglandin-like acid. The structures were elucidated by spectroscopic methods, especially high field 1H NMR and some chemical transformations. The stereochemistry of some 8,12-germacranolides was established by partial synthesis which required revision of the previous assignments of the configuration of inunolide, its 4,5- and 1,10-epoxide, vernudifloride, simsiolide, 6-hydroxy-1,10-epoxyinunolide and perhaps also of tanachin. The chemotaxonomic situation is discussed briefly. 相似文献
8.
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
9.
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
10.
M.A. Metwally S. El-Dahmy J. Jakupovic F. Bohlmann A.M. Dawidar S.A. Metwally 《Phytochemistry》1985,25(1):255-257
The aerial parts of Cotula cinerea gave, in addition to widespread compounds, a characteristic diacetylenic spiroketal enolether and several sesquiterpene lactones, three of them being glaucolide-like lactones. The structures were elucidated by highfield 1H NMR spectroscopy. 相似文献
11.
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
12.
Ferdinand Bohlmann Christa Zdero Jasmin Jakupovic Harold Robinson Robert M. King 《Phytochemistry》1981,20(9):2239-2244
The investigation of two Eriophyllum species afforded, in addition to numerous known compounds, eight new sesquiterpene lactones related to eriolanin, two eudesmanolides and a new type of sesquiterpene alcohol. The structures were elucidated by spectroscopic methods and a few chemical transformations. The chemotaxonomic situation of this genus, the placement of which is still in doubt, is discussed briefly. 相似文献
13.
The investigation of Calostephane divaricata afforded in addition to known compounds five new eudesmanolides, all being tri-substituted derivatives of 6-epi- α-cyclocostunolides. The structures were eluciated by highfield 1H NMR spectroscopy. The relative positions of the oxygen functions could not be stablished with certainty. The observed shift differences agreed well with the proposed structures. 相似文献
14.
Ferdinand Bohlmann Christa Zdero Robert M. King Harold Robinson 《Phytochemistry》1980,19(6):1141-1143
The investigation of Fitchia speciosa afforded, in addition to known compounds, three new sesquiterpene lactones, iso-β-costal, two p-hydroxyacetophenone derivatives and an isoeugenol derivative. The structures were elucidated by spectroscopic methods. The chemotaxonomic situation in this complicated genus is discussed. 相似文献
15.
Ferdinand Bohlmann Laxmi N. Misra Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1984,23(8):1802-1804
The aerial parts of a new Dimerostemma species afforded four eudesmanolides which are all derivatives of arbusculin B and an aldehyde, obviously a degradation product of syringenin. A reinvestigation of Dimerostemma asperatum gave a further dimerostemmolide. 相似文献
16.
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
17.
Inezia integrifolia afforded, in addition to known compounds, three new eudesmanolides and a guaianolide. Two of the eudesmanolides were obtained as a mixture. The relative position of the ester groups could not be determined with certainty. The chemotaxonomy is discussed briefly. 相似文献
18.
Ferdinand Bohlmann Jasmin Jakupovic Harold Robinson Robert M. King 《Phytochemistry》1981,20(1):109-112
The investigation of two further Gochnatia species afforded five new germacranolides, all being 8,12-lactones. The structures were elucidated by intensive 1H NMR studies and by some chemical transformations. The chemotaxonomic aspects are discussed briefly. 相似文献
19.
20.
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