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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 3056-3065 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 14626-14636 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 1285-1292 
    ISSN: 1434-4475
    Keywords: Keywords. 3-Acetyl-4-methylaminopyridin-2-one; Hydrogen bridge bond; 4-Hydroximinopyridin-2-one; 3-(1-Hydroxyethyliden)-piperidin-2 ; 4-dione; Isoxazolo[4 ; 3-c]pyridinone; Isoxazolo[4 ; 5-c]pyridinone..
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Bei der Umsetzung von 4-Methylamino-5,6-dihydropyridinon mit Acetylchlorid entstand ausschließlich das 3-Acetylderivat. Bei der alkalischen Hydrolyse der Methylaminogruppe entstand ein Gemisch zweier Hydroxyderivate. Diese reagieren mit Hydroxylamin zum Isoxazolo[4,5-c]pyridinon, während das 4-Methylaminoanaloge in Abhängigkeit vom pH-Wert zum Isoxazolo[4,3-c]pyridinon oder zum Isoxazolo[4,5-c]pyridinon cyclisiert. Die Konfiguration der letzteren Verbindungen wurde durch NMR-Messungen gesichert..
    Notes: Summary.  Reaction of 4-methylamino-5,6-dihydropyridinone with acetyl chloride yielded exclusively the 3-acetyl derivative. When the methylamino group of the latter was removed by alkaline hydrolysis, a mixture of two hydroxy derivatives was formed. Those cyclized upon treatment with hydroxylamine exclusively to the isoxazolo[4,5-c]pyridinone, whereas the 4-methylamino analogue yielded, depending on pH, mainly the isoxazolo[4,3-c]pyridinone or the isoxazolo[4,5-c]pyridinone. The configurations of the latter compounds were established by NMR experiments..
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-4475
    Keywords: Keywords. Glycosidation; Glycosides; Terpenes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Randianin, ein hämolytisches Saponin aus Randia dumetorum, sowie einige dazu isomere Glycoside wurden ausgehend von Oleanolsäure synthetisiert. Der Einfluß der Verknüpfung in der Dissaccharidseitenkette auf die hämolytische Wirkung dieser Glycoside wurde untersucht.
    Notes: Summary.  Randianin, a haemolytic active saponin from Randia dumetorum, and some of its isomers with different carbohydrate side chains have been synthesized from oleanolic acid. The influence of the linkage within the disaccharide residue on the haemolytic activity of these glycosides has been investigated.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 921-930 
    ISSN: 1434-4475
    Keywords: Keywords. Abietic acid; Diterpenes; Oxidation; Michael addition; Reformatzky reaction.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung. Es werden selektive Oxidationsreaktionen am Abietinsäuregerüst beschrieben, die zur Einführung von Sauerstoffunktionen am B-bzw. C-Ring führen. Die Oxidationsprodukte können zur Synthese höherer Terpenderivate verwendet werden. An einzelnen Verbindungen werden Aufbaureaktionen beschrieben (Michael-Addition, Reformatzky-Reaktion), die es gestatten, Kohlenstoffketten an den B-Ring zu knüpfen.
    Notes: Summary. Selective oxidations at the B- or C-ring of abietic acid are described. The products can be used as educts for the synthesis of higher terpenes. Carbon side chains are attached to the B-ring via Michael additions and Reformatzky reactions.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-4475
    Keywords: Keywords. Haemolytic activity; Glycosidation; Oleanolic acid; Trisaccharides.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Es wird die erste Partialsynthese monodesmosidischer Oleanolsäuretrisaccharide beschrieden. Ihr hämolytischer Index ist niedriger als der des entsprechenden Disaccharids. Untersucht wurde der Einfluß der Verknüpfung sowie der Konfiguration der Kohlehydrateinheiten auf die hämolytische Aktivität dieser Saponine.
    Notes: Summary.  The first partial synthesis of monodesmosidic oleanolic acid trisaccharides is described. Their haemolytic index is lower compared to the corresponding disaccharide. The influence of the linkage and the configurations of the carbohydrate units on the haemolytic activity of these saponins was investigated.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 697-703 
    ISSN: 1434-4475
    Keywords: Keywords. Diene adducts; Fumaric acid; Laevopimaric acid; Maleic anhydride; Selective reduction.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Bei der Reduktion mit LiAlH4 gingen die Addukte der Lävopimarsäure mit Maleinsäureanhydrid bzw. Fumarsäure in ein Triol, eine Monocarbonsäure und das entsprechende Lacton über. Das Fumarsäureaddukt lieferte zwei Triole mit unterschiedlicher Konfiguration an C-16. Regioselektive Reduktion des Maleinsäureanhydridaddukts mit NaBH4 ergab ein Lacton.
    Notes: Summary.  Diene adducts of laevopimaric acid with maleic anhydride or fumaric acid were reduced with LiAIH4. Besides a triol, a monoacid and the corresponding lactone were obtained from the maleic acid adduct. The fumaric acid adduct afforded two triols with different configuration at C-16. Regioselective reduction of the maleic anhydride adduct with NaBH4 gave a lactone.
    Type of Medium: Electronic Resource
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