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1.
The isolation of eucannabinolide and three new sesquiterpene lactones from Schkuhria anthemoidea is reported. The structures and stereochemistries of the new compounds were established by chemical and spectroscopic means. The structure of santhemoidin B was confirmed by X-ray crystallography. 相似文献
2.
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
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.
From three Mikania species, three new labdanic acid and two kaurenic acid derivatives have been isolated together with known compounds and four new germacranolides, differing only in the ester moiety. 相似文献
5.
Ferdinand Bohlmann Autar K. Dhar Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1981,20(5):1077-1080
The investigation of D. halimifolia afrorded a new glaucolide and two sesquiterpene lactones with an additional propiolactone ring, one elemanolide and one modified germacranolide with an additional ring. Furthermore, two tremetone derivatives were present, a hydroxy-geranylgeraniol, also present in a Kingianthus species, and several known compounds. 相似文献
6.
Ovatifolin and two new sesquiterpene lactones, deacetylovatifolin and arturin (1β-hydroxy-8β-angeloyloxy-eudesmane-4(15),11(13)-diene-6α,12-olide, have been isolated from stems and leaves of Podanthus mitiqui. Two of these compounds showed cytotoxic activity. 相似文献
7.
The isolation of vernoladin and vernolepin is reported. The authenticity of the occurrence of the elemane skeleton in nature is discussed, and a biosynthetic scheme concerning the genus Vernonia is proposed. 相似文献
8.
Three closely related cis-Δ4-diepoxygermacranolides were isolated from two Liatris species. Structures of eleganin from L. elegans (Walt.) Michx, and liscundin and liscunditrin from L. secunda (Ell.) Small. were established by NMR spectrometry, chemical transformations and correlation with punctaliatrin previously isolated from L. punctata Hook. Reinvestigation of the latter species yielded another germacranolide liatripunctin whose structure is reported. 相似文献
9.
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
10.
Ferdinand Bohlmann Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1981,20(7):1613-1622
The aerial parts of L. santosii afforded three new diterpenes, a phenylpropanol, three eudesmane derivatives, three germacranolides, seventeen guaianolides and four rearranged guaianolides of a, so far, unknown type. Furthermore, several known compounds were isolated. The structures of the new compounds, the separations of which caused difficulties, were elucidated by spectroscopic methods and by some chemical transformations. The chemotaxonomic situation is discussed briefly. 相似文献