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  • Keywords. 3-Acetyl-4-methylaminopyridin-2-one; Hydrogen bridge bond; 4-Hydroximinopyridin-2-one; 3-(1-Hydroxyethyliden)-piperidin-2  (1)
  • Keywords. Haemolytic activity; Glycosidation; Oleanolic acid; Trisaccharides.  (1)
  • 1
    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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  • 2
    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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