A series of piperonal-based imines (3a–c) and bis -imines (5a-o) have been synthesized in search of new urease inhibitors. Synthesized compounds were characterized by 1 H NMR, 13 C NMR and EI-MS. These derivatives were subjected to evaluation of urease inhibitory potential, which exhibited a varied degree of potential, ranging from 41.7 ± 5.8 to 353.6 ± 5.8 µM, when compared with the standard inhibitor