反应详情

31.6 g (0.2 mol) of 2-methylthio-4,6-dihydroxypyrimidine are added, while stirring well, to 100 cc of sodium hydroxide solution 2N and the mixture is stirred at 50° for half an hour. 34.0 g (0.22 mol) of diethyl sulphate are then added dropwise and with stirring, at 50°; by the addition of sodium sulphate 2N the pH value is kept at between 8 and 8.2. Towards the end of the dropwise addition a precipitate is obtained. The mixture is subsequently stirred at 50° for 1 further hour, cooled to 0° and filtered. The precipitate is washed with cold ethanol, then with ether and dried in a high vacuum at 80°. The obtained white powder has a M.P. of 185°-187°.

1. stirringwith stirring, at 50°
2. additionTowards the end of the dropwise addition a precipitate
3. customis obtained
4. stirringThe mixture is subsequently stirred at 50° for 1 further hour
5. temperaturecooled to 0°
6. filtrationfiltered
7. washThe precipitate is washed with cold ethanol
8. dry with materialwith ether and dried in a high vacuum at 80°