Abstract
A straightforward synthesis of highly functionalized pyrroles was achieved by a one-pot reaction between 3-(cyanomethyl)benzimidazolium salts and acetylenic dipolarophiles under reflux in 1,2-epoxybutane. The new pyrroles can also be obtained by a one-pot three-component reaction from substituted benzimidazoles, bromoacetonitrile, and activated acetylenes. The structures of the pyrroles were deduced by NMR spectroscopy and confirmed by X-ray crystal analysis.
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