Results 231 to 240 of about 16,757 (265)

A further sesquiterpene lactone esterified with a sesquiterpenic acid

Phytochemistry, 1982
Abstract The roots of Hypochoeris oligocephala afforded in addition to known compounds a further sesquiterpene lactone esterified with a sesquiterpenic acid as well as the corresponding free acid.
Rajinder K. Gupta, Jasmin Jakupovic, Ferdinand Bohlmann   +2 more
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Evolution of sesquiterpene lactones in asteraceae [PDF]

Biochemical Systematics and Ecology, 1986
Abstract The two basic micromolecular phenomena which accompany the introduction of a novel lineage in angiosperms, vigorous increase in oxidation state of allelochemics and reduction of the number of major biosynthetic routes, are shown to characterize the evolutionary development of sesquiterpene lactones in tribes of Asteraceae.
Leonora M.A. Comegno, O. R Gottlieb, Coelho Kaplan, Maria Renata de M. Bonfanti, Zenaide S. Ferreira, Vicente de Paulo Emerenciano, Maria Auxiliadora   +6 more
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Sesquiterpene Lactones Revisited

1995
Sesquiterpene lactones are plant constituents often possessing a bitter taste which are common in most tribes of the Asteraceae (Compositae) and also are found in at least 14 other angiosperm families and to a limited extend in gymnosperms, liverworts and fungi.1 There are more than 4,000 known structures in this class of plant secondary metabolites ...
Cesar M. Compadre, John M. Pezzuto, J. Thor Arnason, Robin J. Maries, Elzbieta Bloszyk, Liliana Pazos-Sanou   +5 more
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Sesquiterpene lactones from Achillea crithmifolia

Phytochemistry, 1991
Abstract The isolation of guaianolides rupicolin-A, rupicolin-B, their acetates and a new germacranolide 1β,10α-epoxy-3β,9β-diacetoxy-11α,13-dihydrocostunolide, identified by means of PS DQF COSY and PS NOESY, from Achillea crithmifolia is reported. A flavonoid jaceidin was also isolated from the same extract.
Milosavljević, Slobodan, Macura, Slobodan, Stefanović, Milutin, Aljančić, Ivana, Milinković, Darinka   +4 more
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Sesquiterpene lactones from Laserpitium gallicum

Phytochemistry, 1986
The roots of Laserpitium gallicum gave large amounts of the acetylene falcarindiol and four mixtures of sesquiterpene lactone diesters, whose structure was established by spectral data and chemical reactions.
Giovanni Appending, Maria Grazia Valle, Rosamaria Caniato, Elsa Maria Cappelletti   +3 more
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The first sesquiterpene lactones esterified with a sesquiterpenic acid

Phytochemistry, 1981
Abstract From Hypochoeris glabra two guaianolides esterified with an unusual sesquiterpenic acid were isolated. Proton-catalysed rearrangement of the cyclopropane derivative led to a phenolic acid. The structures were elucidated by high-field 1 H NMR spectroscopy. Further guaianolides were isolated from H. uniflora and Lactuca floridana . These
Wolf-Rainer Abraham, Christa Zdero, Jasmin Jakupovic, Ferdinand Bohlmann   +3 more
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Sesquiterpene lactones from Lugoa revoluta

Biochemical Systematics and Ecology, 2001
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Jorge Triana, Joseé L. Eiroa, Jaime Bermejo Barrera, Juan Ortega, Antonio G. González, Mariana López   +5 more
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11,13-Methylenation of sesquiterpene exomethylene-γ-lactones: Synthesis of sesquiterpene cyclopropyl-γ-lactones

Collection of Czechoslovak Chemical Communications, 1991
11,13-Methylene derivatives of sesquiterpene exomethylene-γ-lactones were prepared by reaction of diazomethane and photolysis of the resulting pyrazoline adduct(s). Variable amounts of exomethylene- and ethylidene-γ-lactones were also formed in the photolysis reaction.
G. APPENDINO, E. GHILARDI E, CRAVOTTO, Giancarlo, P. GARIBOLDI   +3 more
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Sesquiterpene lactones of Eupatorium scabridum

Phytochemistry, 1982
Abstract Eupatorium scabridum , a hybrid biotype presumed to arise by hybridization of E. rotundifolium and E. semiserratum furnished anti-tumor sesquiterpene lactones characteristic of the putative parents.
Werner Herz, Palianappan Kulanthaivel
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Sesquiterpene lactones ofFerula olgae

Chemistry of Natural Compounds, 1975
1. Six sesquiterpene lactones have been isolated fromFerula olgae Regel et Schmalh. Three of them have been identified with talassins A and B and 4-acetoxypruteninone, which have been described previously.
K. S. Rybalko, V. I. Sheichenko, O. A. Konovalova   +2 more
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