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  • 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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