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N -Substituted pyrroles have been prepared in high isolated yields (65–90%) by the reaction of hexane-2,5-dione with amines or diamines in the presence of Fe 3 O 4 @ L -proline@SO 3 H at ambient temperature under ultrasonic irradiation and without solvent. The experimental procedure involves simple operations, and the products are readily separated by external magnet. The same reaction of hexane-2,5-dione with amines containing electron-acceptor substituents, such as 4-nitroaniline, resulted in fair yields of pyrrole derivatives.

inorganic and nano-metal chemistry

Synthesis of Fe 3 O 4 @ L -proline@SO 3 H as a novel and reusable acidic magnetic nanocatalyst and its application for the synthesis of  N -substituted pyrroles at room temperature under ultrasonic irradiation and without solvent