反应详情

13.9 g of 2-amino-4-methoxy-6-methylpyrimidine were dissolved in 150 ml of dry dichloromethane. To this solution was added dropwise a solution of 28.5 g of 2-biphenylylsulfonyl isocyanate in 40 ml of toluene over an hour. During this addition, the internal temperature was maintained at room temperature. When the addition was finished, the mixture was stirred at room temperature for 10 hours to complete the reaction. After completion of the reaction, the mixture was concentrated to about half the volume by evaporating dichloromethane under reduced pressure. The resultant colorless crystals were filtered. The crystals were then washed with a small amount of ether and dried to obtain 34.6 g of N-2-biphenylylsulfonyl-N'-(4-methoxy-6-methylpyrimidin-2-yl) urea; m.p. 199°-202° C.

1. additionDuring this addition
2. additionWhen the addition
3. customthe reaction
4. customAfter completion of the reaction
5. concentrationthe mixture was concentrated to about half the volume
6. customby evaporating dichloromethane under reduced pressure
7. filtrationThe resultant colorless crystals were filtered
8. washThe crystals were then washed with a small amount of ether
9. customdried