Synthesis and Antimicrobial Activity of Heterocycle based Chalcone Derivatives

An efficient procedure for the synthesis of novel chalcones containing heterocyclic ring by Claisen-Schmidt condensation of 2-acetyl thiophene with heterocyclic carboxaldehyde, substituted benzaldehyde in the presence of aqueous alkaline bases produced chalcones in good yield (3a-f) is developed. These chalcones undergoes hydroamination with N-protected N-Boc piperazine followed by deprotection with trifluoroacetic acid gives corresponding amino derivatives with good yield (7a-f). The synthesized compounds were characterized by melting point, FTIR, 1H & 13C NMR and MS spectroscopic data. The synthesized compounds were also evaluated in vitro for their antibacterial activity against different bacterial and fungal species. Among the sythesized compounds, compound 7c showed the maximum potent antibacterial and antifungal activities.