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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1081-1087 
    ISSN: 0009-2940
    Keywords: Carbonyl ylides ; Furans ; Intramolecular cycloadditions ; Isomünchnones ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Intramolekulare Cycloadditionen von mesoionischen Carbonylyliden mit Alkinen. Synthese von 5,6-Dihydro-4H-cyclopenta- und 4,5,6,7-Tetrahydrobenzo[b]furan-DerivatenIntramolekulare Cycloadditionen von acetylenischen Isomünchnonen, die in situ durch Rhodiumacetat-katalysierte Zersetzung von N-(Diazoacetyl)-N-methylalkinamid-Derivaten 16a-c, 18c und 18d erzeugt wurden, sind untersucht worden. Die Primäraddukte fragmentieren unter den Reaktionsbedingungen (110°C) zu den anellierten Furanen 19a-c, 20c und 20d.
    Notes: Intramolecular cycloaddition reactions of acetylenic isomünchnones, formed in situ by rhodium acetate catalyzed decomposition of N-(diazoacetyl)-N-methylalkynamide derivatives 16a-c, 18c, and 18d have been studied. The intermediate cycloadducts fragmentate spontaneously under the reaction conditions (110°C) to afford the annulated furans 19a-c, 20c, and 20d.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1505-1509 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Functionally Substituted Pyridines by Hetero-Diels-Alder Reaction with Inverse Electron DemandInverse type hetero-Diels-Alder reaction of functionally substituted α,β-unsaturated carbonyl compounds with enol ethers afforded “exo/endo” mixtures of the γ-acetoxy-substituted dihydropyrans 2, 5, and 8, respectively. Deacetylation, oxidation of the hydroxy group, alcohol elimination, and ammonia treatment provided the γ-pyridones 14-16, which upon O-alkylation were transformed into the pyridines 21, 22, and 25, respectively, possessing electron-donating ring substituents. The structures were assigned by 1H-NMR data and by comparison with structural isomers.
    Notes: Die inverse Hetero-Diels-Alder-Reaktion zwischen funktionell substituierten α,β-ungesättigten Carbonylverbindungen und Enolethern lieferte die γ-Acetoxy-substituierten Dihydropyrane 2, 5 und 8 als “exo/endo”-Gemische. Durch Desacetylierung, Oxidation der Hydroxygruppe, Alkohol-Eliminierung und Behandlung mit Ammoniak wurden daraus die γ-Pyridone 14-16 gewonnen, die durch O-Alkylierung in die Pyridine 21, 22 und 25 mit elektronenliefernden Ringsubstituenten übergeführt wurden. Die Strukturen wurden mit Hilfe von 1H-NMR-Daten und durch Vergleich mit Strukturisomeren zugeordnet.
    Type of Medium: Electronic Resource
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