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  • 1
    Electronic Resource
    Electronic Resource
    Benzimidazole condensed ring systems, VI: Organic azides in heterocyclic synthesis, X: Synthesis of some substituted pyrimido[1,6-a]-benzimidazoles as potential antimicrobial agents (1989)
    Springer
    Monatshefte für Chemie 120 (1989), S. 1159-1164 
    Details
    ISSN: 1434-4475
    Keywords: Condensed benzimidazo-uracils ; Tricyclic pyrimido[1,6-a]benzimidazoles ; Geminal diazido compounds ; “Staudinger reaction”
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Synthese von 3-Chlor-2-alkyl-pyrimido[1,6-a]benzimidazol-1(2H)-onen (2 a, b) und von 4,4-Dichlor- und 4,4-dibrom-pyrimido[1,6-a]benzimidazol-1,3(2H,4H)-dionen (3 a, b, 4) wird beschrieben. Diese Verbindungen lassen sich zu den entsprechenden Azido- (5, 6), Amino- (8), Morpholino- (9 a, 10, 11), Piperidino- (9 b), Cyano- (12) und Methoxy- (13) Derivaten umwandeln.
    Notes: Summary The syntheses of 3-chloro derivatives of 2-alkyl-pyrimido[1,6-a]benzimidazol-1(2H)-ones2a, b as well as of 4,4-dichloro and 4,4-dibromo derivatives of 2-alkylpyrimido[1,6-a]benzimidazole-1,3(2H,4H)-diones3 a, b and4 are reported. Methods for converting some of the chloro compounds to azido (5, 6), amino (8), morpholino (9 a,10,11), piperidino (9 b), cyano (12), and methoxy (13) derivatives of the adopted tricyclic system are also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809299
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions with 2-aminonicotinic acid, I Some 8-aza analogs of quinazolinones and derived tricyclic compounds (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 1197-1203 
    Details
    ISSN: 1434-4475
    Keywords: 10-Aza-5,6-dihydro-3-hydroxy-5-(2-methylphenyl)-2-substituted-1H-pyrido[1,2-a]quinazoline-1,6-diones ; Bis-2,4,6-trichlorophenyl malonates ; 3H-Pyrido[2,3-d]pyrimidin-4-ones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Fusion von 2-Acetamidonikotinsäure mito-Toluidin,p-Bromanilin odero-Chloranilin ergab die entsprechenden 3-Aryl-2-methyl-pyrido[2,3-d]pyrimidin-4(3H)-one (4) und die 8-Aza-Analogen von 3-Aryl-2-methyl-4-chinazolinonen zusammen mit 2-Aminonikotinsäure. 2-Methyl-3-(2-methylphenyl)-pyrido[2,3-d]pyrimidin-4(3H)-on (4a), das 8-Aza-Analog von Methaqualon, wurde mittels Kondensation mit einigen aromatischen Aldehyden zu den 2-substituierten Styryl-Derivaten6 umgesetzt. Die Reaktion mit monosubstituierten Bis-2,4,6-trichlorphenylmalonaten ergab tricyclische 10-Aza-5,6-dihydro-3-hydroxy-5-(2-methylphenyl)-2-substituierte 1H-Pyrido[1,2-a]quinazolin-1,6-dione (8).
    Notes: Abstract The fusion of 2-acetamidonicotinic acid witho-toluidine,p-bromoaniline oro-chloroaniline afforded the corresponding 3-aryl-2-methyl-pyrido-[2,3-d]pyrimidin-4(3H)-ones (4), the 8-aza analogs of 3-aryl-2-methyl-4-quinazolinones, alongside 2-aminonicotinic acid. 2-Methyl-3-2(2-methylphenyl)-pyrido[2,3-d]pyrimidin-4(3H)-one (4a), the 8-aza analog of methaqualone, was converted to the 2-substituted styryl derivatives6 by condensation with some aromatic aldehydes and to the tricyclic system, 10-aza-5,6-dihydro-3-hydroxy-5-(2-methylphenyl)-2-substituted-1H-pyrido [1,2-a] quinazoline-1,6-diones (8) by reaction with monosubstituted bis-2,4,6-trichlorophenyl malonates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799933
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    Paper (German National Licenses)
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