反应详情

温度

0 °C

4-Methoxypyridine-2-carboxylic acid methyl ester (17.6 g, 0.105 mol) was dissolved in methanol (100 ml) and cooled to 0° C. before adding hydrazine hydrate (21 ml) dropwise over 10 min. The mixture was then refrigerated at 4° C. for 16 h. The resulting solid was filtered, washed with cold methanol and dried to afford 4-methoxypyridine-2-carboxylic acid hydrazide (14.3 g, 81%) as a white powder. 1H NMR (360 MHz, CDCl3) δH 3.89 (3H, s), 4.55 (2H, br s), 7.12 (1H, dd, J 3 and 6), 7.50 (1H, d, J 3), 8.42 (1H, d, J 6), 9.79 (1H, br s).

1. filtrationThe resulting solid was filtered
2. washwashed with cold methanol
3. customdried