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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 284-287 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 301-314 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 76. On Constituents of the Eupatorium GroupThe investigation of six Mexican species of the old genus Eupatorium which are now placed in the genera Ageratina, Critonia and Fleischmannia, yields two new sesquiterpenic acids (12 and 16), a cadinane derivative (40) and three sesquiterpene lactones (41, 57 and 58). In addition besides already known compounds eleven new thymol derivatives (3-10 and 46-48), four p-hydroxy-acetophenone derivatives (21, 26, 30 and 45), three benzyl benzoates (35-37), a flavanone (54) and a lignan (60) are isolated. The structures are established by spectroscopic data as well as by some chemical reactions. The chemotaxonomical aspects are discussed.
    Notes: Die Untersuchung von sechs mexikanischen Arten der alten Gattung Eupatorium, die jetzt in die Gattungen Ageratina, Critonia und Fleischmannia eingeordnet werden, ergibt zwei neue Sesquiterpensäuren (12 und 16), ein Cadinan-Derivat (40) und drei Sesquiterpenlactone (41, 57 und 58). Außerdem werden neben bereits bekannten Verbindungen elf neue Thymolderivate (3-10 und 46-48), vier p-Hydroxyacetophenon-Derivate (21, 26, 30 und 45), drei Benzoesäurebenzylester (35-37), ein Flavanon (54) und ein Lignan (60) isoliert. Die Konstitutionen werden durch spektroskopische Daten sowie durch einige chemische Reaktionen geklärt. Die chemotaxonomischen Aspekte werden diskutiert.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1205-1212 
    ISSN: 1434-193X
    Keywords: New tricyclic sesquiterpene alcohols ; Natural products ; Essential oil ; Compositae ; Odoriferous substances ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The strong patchouli-like and woody smelling essential oil of the rhizomes of Echinops giganteus var. lelyi C. D. Adams (Compositae) contains only sesquiterpenes, which are mainly triquinanes. Besides the known tricyclic compounds, silphiperfol-5- (1, 3) and -6-ene (4), modhephen-2-ene (5), α- (6) and β-isocomene (7), silphiperfolan-7β-ol (12), presilphiperfolan-8-ol (13), silphiperfol-6-en-5-one (14) and 7-epi-silphiperfolan-6β-ol (20), the following compounds, three of which (15, 17, 18) have new skeletons, were found, for the first time, occurring naturally: presilphiperfol-7-ene (2), cameroonan-7-ol (15), an 11(7→8)-abeo-presilphiperfolan-7-ol, prenopsan-8-ol (17), a 1(8→7)-abeo-cameroonan-8-ol, and nopsan-4-ol (18), a 3(4→8)-abeo-prenopsan-4-ol, three diastereomers of silphiperfolan-6-ol (19, 21, 22), modheph-2-en-8-ol (23) and silphiperfola-4,7(14)-diene (24). All structures were elucidated by NMR spectroscopy. A biogenetic pathway from a presilphiperfolane cation C to the cameroonane K, prenopsane L and nopsane M cations is shown. Cameroonanol (15) and prenopsanol (17) are the main contributors to the fragrance of the total oil.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Decathieleanolide, a Dimeric Guaianolide from Decachaeta thieleanaIn addition to the main constituent, the guaianolide thieleanin (1), the aerial parts of Decachaeta thieleana afforded the four further guaianolides 2-5 and an unusual dimeric sesquiterpene lactone named decathieleanolide (10). The structures were elucidated by spectroscopic methods. The assignment of the signals of the very complex 1H NMR spectrum of 10 was possible by using double resonance experiments and 2D-J spectroscopy. The biogenesis is discussed briefly.
    Notes: Neben dem Hauptinhaltsstoff, dem Guajanolid Thieleanin (1), ergeben die oberirdischen Teile von Decachaeta theileana die vier weiteren Guajanolide 2-5 und ein ungewöhnliches dimeres Sesquiterpenlacton, das Decathieleanolid (10) genannt wird. Die Strukturen werden durch spektroskopische Methoden geklärt. Die Zuordnung der Signale des sehr komplexen 1H-NMR-Spektrums von 10 wird durch Doppelresonanzexperimente und 2D-J-Spektroskopie ermöglicht. Die Biogenese wird kurz diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vernocistifolides and Other Sesquiterpene Lactones from Vernonia and Related SpeciesThe investigation of the aerial parts of 17 Vernonia, one Struchium, one Muschleria, one Centratherum, and one Gongrothamnus species afforded in addition to known sesquiterpene lactones 37 new ones: 13 vernocistifolides (1-13), the related triacetate 14, the enollactone 15, the glaucolides 16, 19, 29-33, 35, and 36, two representatives of a new type of dilactones (27 and 28), the elemanolides 37, 43, and 44, the germacranolides 38, 39, 42, 47, and 48, the eudesmanolides 40 and 41 as well as the centratherin derivative 51. The structures and the stereochemistry were elucidated by high-field NMR techniques. The chemotaxonomy and the biogenetic relationships are discussed briefly.
    Notes: Die Untersuchung der oberirdischen Teile von 17 Vernonia-Arten, einer Struchium-, einer Muschleria-, einer Centratherum- und einer Gongrothamnus-Art liefert, neben bekannten, 37 neue Sesquiterpenlactone: 13 Vernocistifolide (1-13), das verwandte Triacetat 14 und das Enollacton 15, die Glaucolide 16, 19, 29-33, 35 und 36, zwei Vertreter eines neuen Dilacton-Typs (27 und 28), die Elemanolide 37, 43 und 44, die Germacranolide 38, 39, 42, 47 und 48, die Eudesmanolide 40 und 41 sowie das Centratherin-Derivat 51. Die Strukturen und die Stereochemie werden durch Hochfeld-NMR-Techniken geklärt. Die Chemotaxonomie und die biogenetischen Beziehungen werden kurz diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Sesquiterpene lactones and Rosane Derrivatives from Trichogonia SpeciesThe investigation of five Trichoginia species afforded in addition to known compounds 22 sesquiterpene lactones, five guaianolides (13-15, 17, and 18), four heliangolides (19 and 21-23), five bejaranolides (30-34), two trichogoniolides (37 and 38), two epimeric trichosalviolides (42 and 43), two atripliciolides (27 and 28), a germacranolide (45), and a modified isotrichogoniolide (41). Furthermore eleven diterpenes, ten being rosane derivatives (46-54 and 57) and one a pimarene alcohol (60), as well as two aromatic compounds (6 and 10), related to p-hydroxyacetophenone, were isolated. The structures were elucidated by spectroscopic methods and a few chemical transformations. The biogenetic relationships are discussed.
    Notes: Die Untersuchungen von fünf Trichogonia-Arten ergaben zusätzlich zu bekannten Verbindungen 22 Sequiterpenlactone, fünf Guajanolide (13-15, 17 und 18), vier Heliangolide (19 und 21-23), fünf Bejaranolide (30-34), zwei Trichogoniolide (37 und 38), zwei epimere Trichosalviolide (42 und 43), zwei Atripliciolide (27 und 28), ein Germacranolid (45) und ein modifiziertes Isotrichogoniolid (41). Außerdem wurden elf Diterpene, zehn Rosan-Derivate (46-54) und 57) und ein Pimarenalkohol (60) sowie zwei aromatische Verbindungen (6 und 10), die sich von p-Hydroxyacetophenon ableiten, isoliert. Die Strukturen wurden durch spektroskopische Methoden und einige chemische Umwandlungen geklärt. Die biogenetischen Beziehungen werden diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Spirosesquiterpenelactones, Germacranolides, and Eudesmanolides from Wunderlichia mirabilisA reinvestigation of the aerial parts of Wunderlichia mirabilis afforded in addition to known compounds ten sesquiterpenelactones, three cis-12,6-germacranolides (7-9), three eudesmanolides (11, 13 and 14), an elemanolide (12) which may be an artifact, and three rearranged eudesmanolides, the spiro compounds 17-19 as well as ylangenyl acetate (1). The structures were elucidated by high-field 1H NMR spectroscopy and some chemical transformations. The stereochemistry of wunderolide (10) and of two onoseriolide (24 and 25) derivatives, which were isolated previously, are corrected.
    Notes: Eine erneute Untersuchung der oberirdischen Teile ovn Wunderlichia mirabilis ergibt zusätzlich zu bekannten Verbindungen zehn Sesquiterpenlactone, drei cis-12,6-Germacranolide (7-9), drei Eudesmanolide (11, 13 und 14), ein Elemanolid (12), das ein Artefact sein könnte, und drei umgelagerte Eudesmanolide, die Spiroverbindungen 17-19 sowie Ylangenylacetat (1). Die Strukturen werden durch Hochfeld-1H-NMR-Spektroskopie und einige chemische Umwandlungen geklärt. Die Stereochemie von Wunderolid (10) und von zwei Onoserioliden (24 und 25), die früher isoliert wurden, wird korrigiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1474-1477 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rudbeckiolide, a Dimeric Sesquiterpene Lactone from Rudbeckia laciniataRoots of Rudbeckia laciniata afforded in addition to known compounds minute amounts of an unusual dimeric sesquiterpene lactone (9). Its constitution was elucidated by detailed 1H NMR spectroscopy, and the stereochemistry followed from the couplings observed and especially from the results of NOE difference spectroscopy.
    Notes: Wurzeln von Rudbeckia laciniata ergeben neben bekannten Verbindungen in sehr kleiner Menge ein ungewöhnliches dimeres Sesquiterpenlacton (9). Dessen Konstitution konnte durch eingehende 1H-NMR-spektroskopische Untersuchungen, die Stereochemie aus den beobachteten Kopplungen sowie vor allem durch die Ergebnisse der NOE-Differenzspektroskopie geklärt werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 2922).  -  The First Sesquiterpene Lactone with an Allenic GroupHerrn Prof. Dr. K. Dimroth zum 70. Geburtstag gewidmet.In addition to some known triterpenes, from the aerial parts of Vernonia cotoneaster Less, was isolated the sesquiterpene lactone vernonallenoid (4) which most probably is the first allenic derivative in this series.
    Notes: Neben einigen bekannten Triterpenen isoliert man aus den oberirdischen Teilen von Vernonia cotoneaster Less, das Sesquiterpenlacton Vernonallenoid (4), bei dem es sich um das erste Allenderivat in dieser Reihe handeln dürfte.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heliangolides, Trachylobane, and Villanovane Derivatives from Viguiera SpeciesFrom the aerial parts of Viguiera cordata in addition to budlein A (3) and isoatripliciolide (5) two further heliangolides (6 and 7) were isolated. The aerial parts of V. pazensis afforded in addition to known compounds three trachylobane derivatives (17-19) as well as a further villanovane derivative (22). The structures were elucidated by spectroscopic methods and some chemical transformations.
    Notes: Aus den oberirdischen Teilen von Viguiera cordata werden neben Budlein A (3) und Isoatripliciolid (5) zwei weitere Heliangolide (6 und 7) isoliert. Die oberirdischen Teile von V. pazensis liefern neben bekannten Verbindungen drei Trachyloban-Derivate (17-19) sowie ein weiteres Villanovan-Derivat (22). Die Strukturen werden durch spektroskopische Methoden und einige chemische Umwandlungen geklärt.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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