反应详情

温度

-10 °C

Methyl 3-methylmorpholine-3-carboxylate (4.21 g, 26.4 mmol) was dissolved in THF (60 ml) to form a clear solution. 2,4-Dichloro-5-nitropyrimidine (5.13 g, 26.4 mmol) was added and the solution was cooled to −10° C. Diisopropylethylamine (6.93 ml, 39.7 mmol) was added while the temperature was maintained at −8 to −10° C. The reaction was stirred for 4 hours at 0° C. and for 16 hours at room temperature. The solvent was removed under reduced pressure. EtOAc (120 ml) was added and the mixture was washed with water (3×30 ml). The organic solution was concentrated to afford 8.4 g of crude methyl 4-(2-chloro-5-nitropyrimidin-4-yl)-3-methylmorpholine-3-carboxylate as an oil. The crude material was used in the next step without further purification. MS [M+H] calculated for C11H13ClN4O5, 317. found, 317.

1. customto form a clear solution
2. temperaturewas maintained at −8 to −10° C
3. customThe solvent was removed under reduced pressure
4. additionEtOAc (120 ml) was added
5. washthe mixture was washed with water (3×30 ml)
6. concentrationThe organic solution was concentrated