反应详情

10 G. of 2,4-diamino-6-[3,6-dihydro-1(2H)-pyridyl]pyrimidine-3-oxide are stirred at 5° C. in 150 ml. of methylene chloride and 30 ml. of triethylamine and treated with 20 ml. of chloroformic acid 2-methoxyethyl ester. The mixture is stirred at room temperature for 4 hours, then washed with water and extracted with methylene chloride. The organic phases are evaporated under reduced pressure and the residue is recrystallized from diethyl ether, there being obtained bis(2-methoxyethyl) 6-[3,6-dihydro-1(2H)-pyridyl]-2,4-pyrimidine-dicarbamate-3-oxide, having a melting point of 126°-128° C.

1. washwashed with water
2. extractionextracted with methylene chloride
3. customThe organic phases are evaporated under reduced pressure
4. customthe residue is recrystallized from diethyl ether, there