反应详情

To a solution of 4,6-Dichloro-2-methyl-5-nitro-pyridine-3-carboxylic acid (15 g, 56.6 mmol) and triethylamine (7.9 mL, 57.3 mmol) in dichloromethane (84 mL) at 0° C. was added dropwise ammonia solution in dioxane (0.5 M, 113 mL, 56.5 mmol). The mixture was then stirred overnight. Removal of the solvent followed by column chromatography gave 9 as a yellow crystalline solid. (7.3 g). 1H-NMR δ: 1.32 (t, J=7.1 Hz, 3H), 4.33 (q, J=7.1 Hz, 2H), 8.06 (s, br, 2H), 8.62 (s, 1H).

1. customRemoval of the solvent