The transformation of benzimidazoles into fluorinated pyrroles via cycloaddition reactions of benzimidazolium n-ylides

New highly substituted pyrroles with fluorine atoms in their structure were obtained through an improved twostage procedure starting from 1-(4-fluorobenzyl)benzimidazole, bromoacetonitrile and electron-deficient alkynes via 1,3-dipolar cycloaddition of benzimidazolium N-ylides. The structures of new fluorine-substituted pyrroles were proved by IR and NMR spectroscopy and confirmed by X-Ray analysis.