反应详情

To fuming nitric acid (20 mL, Spectrochem, India) was added (5-methoxy-2-methylpyridine 1-oxide (14 g, 0.100 mol) in one lot and the reaction was stirred at rt for 2 h. Reaction progress was monitored by TLC (50% EtOAc in pet ether.). After completion of the reaction, the reaction mixture was poured in to ice water (100 mL) and neutralized with 40% NaOH solution (PH˜7-7.5) to get a yellow precipitate. The precipitate was stirred for 5-10 min, then filtered and dried to give the title compound as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.51 (s, 1H), 8.21 (s, 1H), 3.95 (s, 3H), 2.31 (s, 3H). MS (ESI, positive ion) m/z: 184.8 (M+H).

1. customReaction progress
2. customAfter completion of the reaction
3. customto get a yellow precipitate
4. stirringThe precipitate was stirred for 5-10 min
5. filtrationfiltered
6. customdried