in higher yields. A new and efficient protocol for the preparation of 4,5-diaminocyclopent-2-enones via the reaction of N-sulfonylimine with secondary amines, with p-toluenesulfonamide acting as a leaving group, is presented. In addition, p-toluenesulfonamide worked well as a catalyst even with a catalytic amount for the reaction of 2-furaldehyde and secondary amines to afford the corresponding products