Monatshefte für Chemie / Chemical Monthly

, Volume 114, Issue 4, pp 425–432 | Cite as

Tricyclic heteroaromatic ring systems IV. Synthesis and reactions of 4H-Pyrazolo[1,5-a]benzimidazole

  • Misbahul A. Khan
  • Vera L. T. Ribeiro
Organische Chemie Und Biochemie

Abstract

The 4H-Pyrazolo[1,5-a]benzimidazole ring system was prepared by an intramolecularUllmann arylation of 4-substituted 1-(o-aminophenyl)pyrazole while other derivatives were obtained by functional group modifications. Some electrophilic substitutions (nitration, bromination) and alkylations were also carried out.

Keywords

Alkylation Bromination Nitration Ullmann arylation 

Tricyclische heteroaromatische Ringsysteme, 4. Mitt.: Synthese und Reaktionen von 4H-Pyrazolo[1,5-a]benzimidazolen

Zusammenfassung

Das 4H-Pyrazolo[1,5-a]benzimidazol-System wurde mittels intramolekularerUllmann-Arylierung von 4-substituierten 1-(o-Aminophenyl)pyrazolen hergestellt; weitere Derivate wurden dann durch Modifikation funktioneller Gruppen synthetisiert. Einige elektrophile Substitutionen (Nitrierung, Bromierung) und Alkylierungen wurden ebenfalls durchgeführt.

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Misbahul A. Khan
    • 1
  • Vera L. T. Ribeiro
    • 1
  1. 1.Seção de Quimica, Instituto Militar de Engenharia, Praia VermelhaRio de Janeiro, RJBrasil

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