Anti-corrosion and antioxidant activities of new synthesised oxazepine and thaizolidinone derivatives linking to imidazo/pyridine

In this work, 2-amino pyridine was mixed with biphenyl bromide under refluxed to give the product of 2-biphenyl imidazo [1,2-a] pyridine (1). Compound (1) was treated with 4-amino acetophenone with formaldehyde dissolved in absolute ethanol to yield Mannich base (2). Schiff bases [3I-3K] were also prepared by condensed compound (2) dissolved in absolute ethanol with few drops of glacial acetic acid and different aromatic amines. After that, Schiff bases were cyclized using three reagents such as marcapto acetic acid, succinic anhydride, and 3-Nitrophthalic anhydride dissolved in absolute ethanol under refluxed at certain temperature to form thiozolidinone (4I-4K), (1,3)oxazepine-4,7-dione (5K-5I) and 4-Nitro benzo (1,3) oxazepine-4,7-dione (6I-6K) compounds. All compounds were characterized by FT-IR, 1H-NMR, and 13C-NMR spectra. Some new compounds were evaluated as antioxidant and anticorrosion agents.