882145-58-6Relevant articles and documents
Synthesis of a new polyheterocyclic system - Pyrazolo[5′,1′:2, 3]pyrimido[1,6-a]benzimidazole
Dzvinchuk,Lozinskii
, p. 1419 - 1423 (2005)
Cyanoethylhydrazones of 2-aroylmethyl-1H-benzimidazoles undergo recyclization on reaction with trifluoroacetyl anhydride to give 3-aryl-1-cyanoethyl-5-(2-trfluoroacetaminoanilino)pyrazoles. The recyclization products may be cyclized with closing of the benzimidazole ring in two ways: with formation of 1-(5-pyrazolyl)benzimidazoles or 5,6-dihydroderivatives of a new polyheterocyclic system - pyrazolo[5′,1′:2,3]pyrimido[1,6-a] benzimidazole. 2005 Springer Science+Business Media, Inc.