反应详情

4-Aminosalicylic acid (12.3 g) is placed in a round bottom flask. The flask is charged with 150 mL of methanol and 20 mL of concentrated sulfuric acid. The reaction mixture is brought to gentle reflux for 1 day, and then allowed to cool to room temperature. The mixture is further chilled in a freezer and methyl 4-aminosalicylate bisulfate is crystallized. The crystals are collected and washed with cold methanol to afford 15.8 g of the product as off-white needles.

1. temperatureto gentle reflux for 1 day
2. customis crystallized
3. customThe crystals are collected
4. washwashed with cold methanol