反应详情

46.3 g (0.32 mol) of 6-chloro-2,4-diamino-pyrimidine are dissolved in 1000 ml of tetrahydrofuran and treated with 57.9 g (0.517 mol) of potassium tert.butylate. The gel-like precipitate is stirred at room temperature for 1 hour. A solution of 60.5 g (0.48 mol) of 1-methoxycarbonylimidazole in 100 ml of ether is added thereto at a temperature of 10° within 90 minutes. The mixture is thereafter stirred at 25° for a further 2 hours, the solvent is then evaporated under reduced pressure and the residue is dissolved in ethyl acetate. The organic solution is washed with cold water and dried over sodium sulfate. After evaporation of the solvent under reduced pressure, the residue is crystallized from acetone/ether. After recrystallization from chloroform/methanol/hexane, there is obtained methyl 2-amino-6-chloro-4-pyrimidinecarbamate of melting point 225°-226°.

1. waitat a temperature of 10° within 90 minutes
2. stirringThe mixture is thereafter stirred at 25° for a further 2 hours
3. customthe solvent is then evaporated under reduced pressure
4. dissolutionthe residue is dissolved in ethyl acetate
5. washThe organic solution is washed with cold water
6. dry with materialdried over sodium sulfate
7. customAfter evaporation of the solvent under reduced pressure
8. customthe residue is crystallized from acetone/ether
9. customAfter recrystallization from chloroform/methanol/hexane