Ultrasound and water-mediated synthesis of bis-thiazoles catalyzed by Fe(SD)<sub>3</sub> as Lewis acid-surfactant-combined catalyst

<p>Preparation of bis-aminothiazoles under different conditions including synthesis in EtOH under ultrasound irradiation and also in water in the presence of Fe(SD)<sub>3</sub> as Lewis acid-surfactant-combined catalyst (LASC) under ultrasound irradiation has been studied. The results were compared with the traditional reflux method. Also, the results confirmed the efficiency of the synthesis in water and under ultrasound irradiation technique. Moreover, the antibacterial activity of products was investigated using the well-diffusion method against bacterial strains including <i>Micrococcus luteus</i>, <i>Escherichia coli</i>, <i>Pseudomonas aeruginosa</i> and <i>Bacillus subtilis</i>. All of the products showed good antibacterial activity against <i>M. luteus</i> and <i>E. coli</i>. Most of the products showed antibacterial activity higher than erythromycin against <i>M. luteus</i>, <i>E. coli</i>, and <i>B. subtilis</i>.</p>