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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 112 (1981), S. 1393-1404 
    ISSN: 1434-4475
    Keywords: 4-Aminothiazoline-2-ylidennitriles ; 4-Aminothiazolin-2-one-hydrazones ; 2,4-Diaminothiazoles ; 2,4-Diamino-thiophenes ; Pyrrolo[2,1-b]thiazoles ; Thorpe-Cyclization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 4-Aminothiazolin-2-one-hydrazones3 are obtained by succesive treatment of the title compound1 with dimethyl sulfate and hydrazinehydrate. The rearrangement of 4-aminothiazolin-2-ylidenmalononitrile7 derived from1 yields the 2,4-diamino-thiophene derivatives8. Analogously, the 4-aminothiazolin-2-yliden-cyanamides10 react to form the substituted 2,4-diaminothiazoles11. Succesive reaction of the ethyl (4-amino-2-thioxo-thiazolinyl-3)-acetates12 with dimethyl sulfate and malononitrile yields the 3,6-diamino-pyrrolo[2,1-b]-thiazoles14.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 123 (1992), S. 455-459 
    ISSN: 1434-4475
    Keywords: 3-Amino-thiophenes ; 3-Amino-selenophenes ; α-Chlorocarbonyl compounds ; β-Chloro-α-cyan-cinnamonitrile ; α-Oxo-thioles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary β-Chloro-α-cyano-cinnamonitrile (1) reacts in one step with α-oxo-thioles3 or successively with sodium sulphide and α-chlorocarbonyl compounds4 to form the 5-substituted 4-amino-2-phenyl-thiophene-3-carbonitriles5. Analogously, the successive reactions of β-chloro cinnamonitrile1 with sodium selenide — produced in situ from selene and sodium boronhydride — and α-chlorocarbonyl compounds4 yields the 5-substituted 4-amino-2-phenyl-selenophene-3-carbonitriles6.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-4475
    Keywords: 2-Aminothiophene-3-carboxylic acid derivatives ; 1-Amino-2-pyridone ; 1,2-Dihydro-2-oxo-pyridine-5-thioles ; Pyridazin-6(1H)-one
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Whereas treatment of the ethyl 5-acetyl-2-amino-4-methyl-thiophene-3-carboxylate (1) with potassium hydroxide yields the 2-hydroxy-thiophene-3-carbonitrile4 its hydrazone2 is converted into the 1-amino-5-mercapto-2-pyridone derivative6. The transformation of the 2-amino-5-phenylazo-thiophene derivative9 by potassium hydroxide yields the substituted 3-mercapto-pyridazin-6(1H)one10, with sodium ethoxide the 5-phenylhydrazono-2-oxo-thiolen-3-carbonitrile11 is formed. From6 the 5-mercapto-2-pyridone derivatives7 d,e can be obtained.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 573-575 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 2-Thiophenamines with HydrazineDepending on their substituents 2-thiophenamines react with hydrazine hydrate on different ways: Hydrazinolysis of the ester 1 yields the 2-amino-3-thiophenecarbohydrazide 2. 4-Phenyl-2-thiophenamine (4) is converted into the 2(5H)-thiophenone hydrazone 5 by exchange of the amino group. The thiophenamines 7, 9, 12 undergo ring transformation to yield pyridazine derivatives, the N,N′-bis(dihydro-3-pyridazinyl)hydrazine 8, the 3-pyridazinylhydrazine 10, and the pyrazolo[3,4-c]pyridazine 13. From 10 the 1,2,4-triazolo[4,3-b]pyridazine 11 is obtained.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 2198-2207 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Trichloroacetonitrile and Phenyl Cyanate with Ylidene NitrilesThe base-catalyzed addition of ethyl 4,4-dicyano-3-methyl-3-butenoate (1) onto trichloroacetonitrile or phenyl cyanate, respectively, yields the substituted 2-amino-3,5-pyridinedicarboxylic acid derivatives 3. With the same components the 3-amino-2,4-dicyanocrotononitrile (8) analogously reacts to form the substituted 2,4-diamino-3,5-pyridinedicarbonitriles 9. The trichloromethyl or phenoxy group in 3 or 9 is exchanged by hydrazine hydrate to yield the pyrazolo-[3,4-b]pyridines (5, 13). From 3 further the substituted pyrido[2,3-d]pyrimidin-4-one 7 is synthesized. Methyl 3-amino-2,4-dicyanocrotonate (14) reacts with trichloroacetonitrile or phenyl cyanate, respectively, to give the substituted 4-amino-3,5-dicyano-2(1H)-pyridinones 16. These can be converted into 2-alkoxy- and 2,6-dialkoxypyridine derivatives 18 - 21.
    Notes: 4,4-Dicyan-3-methyl-3-butensäure-ethylester (1) addiert sich basenkatalysiert an Trichloracetonitril oder Phenylcyanat unter Bildung von substituierten 2-Amino-3,5-pyridinidcarbonsäure-Derivaten 3. 3-Amino-2,4-dicyancrotononitril (8) reagiert mit den gleichen Komponenten analog zu substituierten 2,4-Diamino-3,5-pyridindicarbonitrilen 9. Hydrazinhydrat tauscht in 3 und 9 die Trichlormethyl- oder Phenoxy-Gruppe aus unter Bildung von Pyrazolo[3,4-b]pyridinen (5, 13). Aus 3 wird ferner das substituierte Pyrido[2,3-d]pyrimidin-4-on 7 hergestellt. Bei der Reaktion von 3-Amino-2,4-dicyancrotonsäure-methylester (14) mit Trichloracetonitril oder Phenylcyanat entstehen substituierte 4-Amino-3,5-dicyan-2(1H)-pyridinone 16. Letztere können in substituierte 2-Alkoxy- und 2,6-Dialkoxypyridine 18-21 umgewandelt werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1390-1394 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of 4-Aminocinnolines from (Arylhydrazono)(cyano)acetic Acid DerivativesThe intramolecular Friedel-Crafts reaction of (arylhydrazono)(cyano)acetamides and -malono-nitriles 1 yields the 4-amino-3-cinnolinecarboxylic acid derivatives 2. Toluene as solvent takes part in the reaction of 1d and e and forms the 4-amino-3-cinnolyl p-tolyl ketones 3. Ethyl (phenylhydrazono)(cyano)acetate reacts in the presence of AlCl3 to yield the 4-hydroxy-3-cinnolinecarbonitrile (4). The pyrimido[5,4-c]cinnolinone 6, the 4-amino-3-cinnolinecarboxylic acid 2g, and its thioamide 2h can be obtained from 2.
    Type of Medium: Electronic Resource
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