Acidic ionic liquid 1-methylimidazolium tetrafluoroborate [HMim](+)[BF4](-), was successfully employed as a reusable catalyst for the reaction of furfural and secondary amines to yield 4,5-diaminocyclopent-2-enones exclusively as trans diastereomer in the absence of solvent. The inherent Bronsted acidity and high polarity of ionic liquid resulted in the significant enhancement in the reaction rate.