反应详情

A solution of 6-chloro-4-hydroxy-5-methylpyridin-2(1H)-one hydrochloride hydrate (67.0 g, 0.313 mmol) in concentrated sulfuric acid (335 mL) was cooled to ˜0° C.; nitric acid (19.6 mL of 16 M) was added dropwise over a period of ten minutes. The reaction was stirred for 20 minutes and then poured slowly into 2.5 L of ice water. A yellow precipitate formed, which was isolated by filtration and dried overnight in a vacuum oven at 60° C. to provide 39.7 g of 6-chloro-4-hydroxy-5-methyl-3-nitropyridin-2(1H)-one as a yellow solid.

1. customA yellow precipitate formed
2. customwhich was isolated by filtration
3. customdried overnight in a vacuum oven at 60° C.