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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 877-887 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 5,10-Bridged Pyrido[3,2-g]quinolines via [4+2] Cycloaddition of Dienophiles to Pyrido[3,2-g]quinolinesIn a Diels-Alder reaction, (E)-1,2-dichloroethene (5a), α-acetoxyacrylonitrile (5b), and maleic anhydride (8), respectively, add to the medium ring of some pyrido[3,2-g]quinolines to afford the 5,10-bridged pyrido[3,2-g]quinolines 6a - c, e, f, and 9a - c, respectively. The regioisomeric α-acetoxyacrylonitrile adducts of 4b arise in a ration of 6e:6f = 94.6. On hydrolysis of this mixture, only ketone 7 is obtained. The structures of all compounds are proven by their proton and carbon-13 spectra.
    Notes: (E)-1,2-Dichlorethen (5a), α-Acetoxyacrylnitril (5b) bzw. Maleinsäureanhydrid (8) addieren sich in einer Diels-Alder-Reaktion an den mittleren Ring einiger Pyrido[3,2-g]chinoline 4 zu den 5, 10-überbrückten Pyrido[3,2g]chinolinen 6a - c, e, f bzw. 9a - c. Die regioisomeren α-Acetoxyacrylnitril-Addukte von 4b entstehen dabei im Verhältnis 6e:6f = 94:6. Durch Hydrolyse erhält man daraus das einheitliche Keton 7. Die Strukturen aller Verbindungen wurden 1H- und 13C-NMR-spektroskopisch bewiesen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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