反应详情

温度

120 °C

2-Amino-4-anilino-6-methoxypyrimidine was synthesized using 2-amino-4,6-dichloropyrimidine as a starting material through 2-amino-4-chloro-6-methoxypyrimidine. A solution of sodium methoxide in 28% methanol (43 mL) at an internal temperature of 20° C. or less was dropwise added to a mixture of 2-amino-4,6-dichloropyrimidine (32.8 g) and acetone (700 mL) under ice cooling. The reaction was further continued at an internal temperature of 40° C. for 4 hours, and the solution was concentrated under reduced pressure, followed by addition of 500 mL of water. The precipitated solid was collected by filtration and was used without purification for the subsequent step. The crude product of 2-amino-4-chloro-6-methoxypyrimidine, aniline (26.7 mL), methoxyethanol (150 mL), and hydrochloric acid (0.2 mL) were mixed, followed by stirring with heating at 120° C. for 3 hours. After cooling, the reaction solution was added to aqueous sodium bicarbonate (500 mL)/ethyl acetate under ice cooling to extract the product with ethyl acetate. After the concentration, purification by column chromatography (ethyl acetate/n-hexane) was performed to yield 14 g of 2-amino-4-anilino-6-methoxypyrimidine.

1. custom2-Amino-4-anilino-6-methoxypyrimidine was synthesized
2. concentrationthe solution was concentrated under reduced pressure
3. additionfollowed by addition of 500 mL of water
4. filtrationThe precipitated solid was collected by filtration
5. customwas used without purification for the subsequent step
6. additionThe crude product of 2-amino-4-chloro-6-methoxypyrimidine, aniline (26.7 mL), methoxyethanol (150 mL), and hydrochloric acid (0.2 mL) were mixed
7. temperatureAfter cooling
8. additionthe reaction solution was added to aqueous sodium bicarbonate (500 mL)/ethyl acetate under ice cooling
9. extractionto extract the product with ethyl acetate
10. concentrationAfter the concentration, purification by column chromatography (ethyl acetate/n-hexane)