反应详情

To a solution of benzyl (2-hydroxy-5-iodopyridin-3-yl)carbamate (16 g, 43 mmol) in CHCl3 (250 mL) was added Ag2CO3 (16.1 g, 58.4 g) and methyl iodide (27.0 mL, 434 mmol) in the dark, and the mixture stirred at RT for overnight. The solid was removed by filtration and the solvent was concentrated and purified by combi-flash (ISCO, 40g silica, UV254, 5:1 pet ether/ethyl acetate) to afford benzyl (5-iodo-2-methoxypyridin-3-yl)carbamate (8.85 g, 53% yield) as a white solid: 1H NMR (400 MHz, CDCl3) δ 8.61 (br, 1H), 7.98 (d, J=1.6 Hz, 1H), 7.35-7.42 (m, 5H), 7.12 (s, 1H), 5.21 (s, 2H), 3.95 (s, 3H); MS (ES) m/z 385 (M+H).

1. customThe solid was removed by filtration
2. concentrationthe solvent was concentrated
3. custompurified by combi-flash (ISCO, 40g silica, UV254, 5:1 pet ether/ethyl acetate)