反应详情

To a solution of acetic acid 4-chlorocarbonyl-2,6-dimethylphenyl ester (2.32 g, 10.0 mmol) in anhydrous CH2Cl2 (30 mL) were added 4-amino-nicotinic acid (4) (1.10 g, 8.00 mmol) and pyridine (2.37 g, 30.0 mmol). The reaction mixture was stirred at room temperature under nitrogen for 40 hours. Solvent was evaporated. The residue was diluted with methanol (20 mL). The solid separated was filtered, washed with methanol (2×10 mL) and dried under vacuum to give acetic acid 2,6-dimethyl-4-(4-oxo-4H-pyrido[4,3-d][1,3]oxazin-2-yl)-phenyl ester (6) as yellow solid. Yield: 1.99 g (64%).

1. customSolvent was evaporated
2. additionThe residue was diluted with methanol (20 mL)
3. customThe solid separated
4. filtrationwas filtered
5. washwashed with methanol (2×10 mL)
6. customdried under vacuum