Activated aldimines are important intermediates in organic synthesis [1]. Their durability for long time and mild reactivity have led them to use in many organic reactions which can be pointed to reactions such as Diels–Alder reactions, radical reactions, nucleophilic additions and ene reactions also [2]. The facile way to prepare these compounds is the use of direct condensation of sulfonamide and various aldehydes, although the preparation of water is no favor. Several ways have been developed to accelerate this reaction by using different additives such as AlCl3, ZrO2/S2O8, TiCl4/Et3N, P2O5/SiO2, montmorillonite K-10 and so on. However, harsh reaction conditions, sensitivity to water, low yields and high catalysts loading limited these reactions [3]. In other side, the use of nanoparticles due to the high surface-to-volume ratio, easy recycling and reusing is a good strategy for increasing the efficiency of chemical reactions.
