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To a stirred solution of 5-methoxy-4-nitropicolinaldehyde (4 g, 0.02 mol) in acetone and water (1:1,100 mL) was added sodium chlorite (5.9 g, 0.065 mol, spectrochem, india) and sulfamic acid (6.3 g, 0.065 mol, Rankem, India) and the reaction mixture was stirred for 1 h at rt. Reaction progress was monitored by TLC (50% EtOAc in petroleum ether). After completion, the reaction mixture was concentrated to get a white precipitate which was filtered and dried to afford the title compound as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 13.6 (brs, 1H) 8.90 (s, 1H), 8.41 (s, 1H), 4.15 (s, 3H). MS (ESI, positive ion) m/z: 197.8 (M+H).

1. customReaction progress
2. concentrationAfter completion, the reaction mixture was concentrated
3. customto get a white precipitate which
4. filtrationwas filtered
5. customdried