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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2001-2018 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3-Chloro-5-dimethylamino-2-formyl-4-aza-2,4-pentadienenitrile, Synthesis and Reactions with Nucleophiles3-Chloro-5-dimethylamino-2-formyl-4-aza-2,4-pentadienenitrile (7) is prepared by partial hydrolysis of the iminium perchlorate 1. In 7 the electrophilic centres (1, 3, 5) regioselectively react with secondary alkylamines, arylamines, and hydrazine derivatives to yield 3-amino-substituted formylazapentadienenitriles and (hydrazonomethyl)azapentadienenitriles. Intramolecular cyclisation leads to triazole betaines, pyrazoles, and 1,4-dihydropyrimidines.
    Notes: 3-Chlor-5-dimethylamino-2-formyl-4-aza-2,4-pentadiennitril (7) wird aus dem Iminiumperchlorat 1 durch partielle Hydrolyse hergestellt. In 7 können an den elektrophilen Zentren (1, 3, 5) mit sekundären Alkylaminen, Arylaminen und Hydrazinderivaten regioselektive Umsetzungen durchgeführt werden. Dabei entstehen 3-amino-substituierte Formylazapentadiennitrile und (Hydrazonomethyl)azapentadiennitrile sowie durch intramolekulare Cyclisierung Triazol-betaine, Pyrazole und 1,4-Dihydropyrimidine.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 1882-1889 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Uracil-Imidazolidinone Rearrangement4-Amino-1,3-dimethyl-5-nitrosouracil derivatives 1b, 3c- e treated with alkali give derivatives of 4,5-diimino-1,3-dimethyl-2-imidazolidinone 4 by opening of the uracil ring at C-6. In contrast, with 1,3-dimethylvioluric acid (3b) under the same conditions the uracil → imidazolidinone rearrangement is accompanied by preferential ring opening at C-2 yielding 2-hydroxyimino-N,N′-dimethylmesoxaldiamide (12).
    Notes: 4-Amino-1,3-dimethyl-5-nitrosouracilderivate 1b, 3c-e ergeben bei der Behandlung mit Alkali unter Öffnung des Uracilringes am C-6 Derivate des 4,5-Diimino-1,3-dimethyl-2-imidazolidinons 4. Bei der 1,3-Dimethylviolursäure (3b) erfolgt dagegen unter gleichen Bedingungen neben der Uracil → Imidazolidinon-Umwandlung bevorzugt eine Ringöffnung am C-2, wobei 2-Hydroxyimino-N,N′-dimethylmesoxaldiamid (12) entsteht.
    Type of Medium: Electronic Resource
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