Microwave-Assisted Synthesis and Antibacterial Activity of Methyl 1-{2-[4-Amino-5-(Naphthalen-1-yl)-4H-1,2,4-Triazol-3-Ylthio]ethyl}-1H-Indole-3-Carboxylate Derivatives

Abstract

Twelve new Schiff bases containing a disubstituted 1,2,4-triazole and a monosubstituted indole linked by a thioethyl group were efficiently synthesised via a method employing microwave irradiation. Compared with a conventional method of heating at 100 °C, yields were increased from 46–48 to 82–92% and the reaction times were reduced from 20–25 h to 4–7 min. The structures of these novel hexacyclic Schiff bases were characterised by their spectral data and elemental analysis. Evaluation of their antibacterial activity showed that many of them possess excellent activity against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Bacillus subtilis.