Synthesized NaA Nanozeolite as a Catalyst for the Preparation of 3-amino imidazo[1,2-a]pyridines under Solvent-Free Conditions

The present study explores a new method for the fabrication of NaA nanozeolite as a simple and efficient catalyst for producing 3-aminoimidazo [1,2-a] pyridines via the 3-component reaction of aldehydes, 2-aminoperidines and isocyanides under solvent-free conditions. The production of the organic template-free (OTF) NaA nanozeolite was performed at room temperature. The prepared nanozeolite was identified by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), Field Emission Scanning Electronic Microscopy (FESEM), N2 sorption isotherm and Particle Size Analysis (PSA). The particle sizes of synthesized spherical NaA nanozeolite were under 100 nm via the FESEM method. BET surface area, total pore volume, and mean pore diameter of the created sample were attained to be 362 m²g^-1, 0.44 cm³ g^-1 and 5.9 nm, respectively. The developed method has some advantages, such as OTF production of NaA nanozeolite, a simple synthesis method with short reaction time and easy separation using filtration, and the ability to recycle and reuse the catalyst several times without reducing its efficiency.