Ionic liquid catalyzed one pot four-component coupling reaction for the synthesis of functionalized pyrroles

A facile and convenient one-pot tandem synthesis of functionalized pyrroles using acidic ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate as a catalyst has been achieved. It involves four-component reaction of amines, aldehydes, 1,3-dicarbonyl compounds and nitroalkane. This method has the advantage of simple and readily available starting materials, low cost, good yields and recyclability of catalyst.