反应详情

温度

70 °C

To the solution of pyrimidine-2,4-diamine (3.0 g, 0.027 mol) in ethanol (90 mL) and aqueous NaHCO3 (2M, 20 mL) was added 2-chloroacetaldehyde (4.3 g, 0.055 mol). The mixture was stirred at 70° C. overnight. TLC showed the starting material disappeared. The solvent was removed under reduced pressure and the residue was extracted with ethyl acetate (3×30 mL). The combined organic layer was concentrated under reduced pressure and the residue was purified by silica-gel column chromatography eluting with 1:5 petroleum ether/ethyl acetate to afford 199a as a white solid (2.2 g, 60%). MS: [M+H]+ 135.1.

1. customThe solvent was removed under reduced pressure
2. extractionthe residue was extracted with ethyl acetate (3×30 mL)
3. concentrationThe combined organic layer was concentrated under reduced pressure
4. customthe residue was purified by silica-gel column chromatography
5. washeluting with 1:5 petroleum ether/ethyl acetate