Chemistry of Heterocyclic Compounds

, Volume 51, Issue 10, pp 918–922 | Cite as

New fluorescent 3H-imidazo[4,5-e][2,1]benzoxazoles: synthesis, spectroscopic characterization, and antibacterial activity

  • Mitra Rezazadeh
  • Mehdi PordelEmail author
  • Abolghasem Davoodnia
  • Sattar Saberi

The new fluorophores of the 3H-imidazo[4,5-e][2,1]benzoxazoles series were synthesized by the regioselective nitration of 3-alkyl-8-phenyl-3H-imidazo[4,5-e][2,1]benzoxazoles. The latter compounds were obtained from the reaction of 1-alkyl-5-nitro-1Hbenzimidazoles with benzyl cyanide in basic MeOH solution. The structures of synthesized compounds were established using spectral (UV-vis, IR, 1H NMR, 13C NMR, and NOESY) and analytical data. Furthermore, it was found that these fluorophores underwent thermal rearrangement to new 5H-imidazo[4,5-f][2,1,3]benzoxadiazole 3-oxides in AcOH in moderate yields. The fluorescence properties and antibacterial activities of new compounds against Gram-positive and Gram-negative bacterial species were also studied.


3H-imidazo[4,5-e][2,1]benzoxazole 5H-imidazo[4,5-f][2,1,3]benzoxadiazole 3-oxide Emission and absorption spectra Fluorescence NOESY 


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Mitra Rezazadeh
    • 1
  • Mehdi Pordel
    • 1
    Email author
  • Abolghasem Davoodnia
    • 1
  • Sattar Saberi
    • 2
  1. 1.Department of Chemistry, Mashhad BranchIslamic Azad UniversityMashhadIran
  2. 2.Buali Research InstituteMashhadIran

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