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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 1207-1211 
    ISSN: 1434-4475
    Keywords: Keywords. Cyanoacetophenone; 1- ; 4- ; 5-Substituted pyrazoles; Ring closure reaction.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Eine verbesserte Darstellung von Cyanacetophenon wird beschrieben. Cyanacetophenon reagierte mit Dimethylformamid-dimethylacetal bzw. Diphenylformamidin zu 1-Dimethylamino-3-oxo-3-phenyl-1-propen-2-carbonitril und 1-Anilinomethylen-3-oxo-3-phenyl-1-propen-2-carbonitril. Durch Umsetzung von 1-Dimethylamino-3-oxo-3-phenyl-1-propen-2-carbonitril mit Hydrazinen wurden entweder 1-substituierte 5-Amino-4-benzoylpyrazole oder (1-substituierte) 4-Cyano-5-phenylpyrazole erhalten. Reaktion von 1-Anilinomethylen-3-oxo-3-phenyl-1-propen-2-carbonitril mit Phenylhydrazin ergab ebenfalls 5-Amino-4-benzoyl-1-phenylpyrazol, während unsubstituiertes Hydrazin zu 4-Cyan-5-phenylpyrazol reagierte.
    Notes: Summary.  An improved synthesis of cyanoacetophenone is described. Cyanoacetophenone was reacted with dimethylformamide-dimethylacetal and diphenylformamidine to give 1-dimethylamino-3-oxo-3-phenyl-1-propene-2-carbonitrile and 1-anilinomethylene-3-oxo-3-phenyl-1-propene-2-carbonitrile. Reaction of 1-dimethylamino-3-oxo-3-phenyl-1-propene-2-carbonitrile with hydrazines gave either 1-substituted 5-amino-4-benzoylpyrazoles or (1-substituted) 4-cyano-5-phenylpyrazoles. Treatment of 1-anilinomethylene-3-oxo-3-phenyl-1-propene-2-carbonitrile with phenylhydrazine also yielded 5-amino-4-benzoyl-1-phenylpyrazole, whereas reaction with unsubstituted hydrazine afforded 4-cyano-5-phenylpyrazole.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 129 (1998), S. 1313-1318 
    ISSN: 1434-4475
    Keywords: Keywords. Ethoxymethylene malononitrile; Ethoxymethylene cyanoacetic acid ethylester; 1 ; 4 ; 5-Trisubstituted pyrazoles; 4 ; 5-Disubstituted pyrazoles; Acyl migration; Rearrangement..
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Reaktion von Ethoxymethylenmalodinitril und Ethoxymethylencyanessigsäureethylester mit substituierten Hydrazinen zu substituierten 5-Aminopyrazolen wird beschrieben. Der Einfluß unterschiedlicher Substituenten auf mögliche Wanderungen während des Ringschlusses wurde untersucht..
    Notes: Summary.  The reaction of ethoxymethylene malononitrile and ethoxymethylene cyanoacetic acid ethylester with substituted hydrazines to substituted 5-aminopyrazoles is described. The influence of different substituents on possible migrations during the ring closure was studied..
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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