Domino Multicomponent Approach for the Synthesis of Functionalized Spiro-Indeno[1,2- b]quinoxaline Heterocyclic Hybrids and Their Antimicrobial Activity, Synergistic Effect and Molecular Docking Simulation

Molecules. 2019 May 22;24(10):1962. doi: 10.3390/molecules24101962.

Abstract

An expedient synthesis of hitherto unexplored novel hybrid heterocycles comprising dispiropyrrolidine, N-styrylpiperidone and indeno[1,2-b]quinoxaline units has been developed via domino multicomponent 1,3-dipolar cycloaddition strategy employing a new class of azomethine ylide in ionic liquid, 1-butyl-3-methylimidazolium bromide. This domino protocol involves, 1,3-dipolar cycloaddition and concomitant enamine reaction affording the dispiropyrrolidine tethered N-styrylpiperidone hybrid heterocycles in moderate to good yield in a single step. These compounds were evaluated for their antimicrobial activity against bacterial and fungal pathogens, therein compounds 8f, 8h, and 8l displayed significant activity against tested microbial pathogens. The synergistic effect revealed that the combination of compound 8h with streptomycin and vancomycin exhibited potent synergistic activity against E. coli ATCC 25922. In addition, molecular docking simulation has also been studied for the most active compound.

Keywords: antimicrobial activity; dispiropyrrolidine; docking studies; domino multicomponent reaction; indeno[1,2-b]quinoxaline; synergistic effect.

MeSH terms

  • Anti-Bacterial Agents / chemical synthesis*
  • Anti-Bacterial Agents / chemistry
  • Anti-Bacterial Agents / pharmacology*
  • Cycloaddition Reaction
  • Drug Synergism
  • Escherichia coli / drug effects
  • Imidazoles / chemistry
  • Microbial Sensitivity Tests
  • Molecular Docking Simulation
  • Molecular Structure
  • Quinoxalines / chemical synthesis*
  • Quinoxalines / chemistry
  • Quinoxalines / pharmacology*
  • Streptomycin / pharmacology
  • Structure-Activity Relationship
  • Vancomycin / pharmacology

Substances

  • Anti-Bacterial Agents
  • Imidazoles
  • Quinoxalines
  • 1-butyl-3-methylimidazolium chloride
  • Vancomycin
  • Streptomycin