Design, synthesis and antibacterial activity of 9-aryl-6-(2-naphthyl) [1,2,4]triazolo[4,3-a][1,8]naphthyridines

Abstract

A concise and highly efficient procedure has been described for the synthesis of 9-aryl-6-(2-naphthyl)[1,2,4] triazolo[4,3-a][1,8]naphthyridines8 by the oxidation of the corresponding aryl aldehyde1-[3-(2-naphthyl) [1,8]naphthyridin-2-yl]hydrazones 7 using silica gel supported ferric chloride (SiO₂-FeCl₃) in solvent-free conditions under microwave irradiation. The desired products are obtained in very good yields and in a state of high purity. The structure of compounds 3-8 have been confirmed by their spectroscopic (IR, ¹H NMR and MS) and analytical data. The compounds 8a-j have been screened for their antibacterial activity.