反应详情

6-methylthio-2H-3,1-benzoxazine-2,4-(1H)-dione (25.11 g; 0.72 mole) is added to a cold solution of 54.4% hydrazine (75 ml) in water (75 ml). After stirring at room temperature overnight, the while solid is filtered, washed with cold water and dried. Yield 21.3 g; mp 124°-127°.

1. filtrationthe while solid is filtered
2. washwashed with cold water
3. customdried