反应详情

温度

146.5 °C

To a solution of 2-amino-4,6-dimethoxy-nicotinamide (0.60 g, 3.00 mmol) and 4-(2-hydroxy-ethoxy)-3,5-dimethyl-benzaldehyde (0.59 g, 3.00 mmol) in N,N-dimethylacetamide (8 mL) was added NaHSO3 (58.5 wt %, 0.59 g, 3.30 mmol) and p-TSA (0.22 g, 1.20 mmol). The reaction mixture was heated to 145-148° C. for 16 hours, then cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure, the residue was diluted with sodium bicarbonate solution (50 mL), and the solid separated was filtered and dried under vacuum. The crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent) to give 2-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-pyrido[2,3-d]pyrimidin-4-one as a white solid. Yield: 0.50 g (49%).

1. temperaturecooled to room temperature
2. customN,N-dimethylacetamide was removed under reduced pressure
3. additionthe residue was diluted with sodium bicarbonate solution (50 mL)
4. customthe solid separated
5. filtrationwas filtered
6. customdried under vacuum
7. customThe crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent)