反应详情

A moderately rapid stream of dry ammonia was introduced at 20°-25° during 3 hours into a solution of 2.5 g of 2,3,6-trimethyl-2H-1,2-thiazin-5(6H)-one 1,1-dioxide in 25 ml of methanol and the mixture was thereupon left to stand overnight. The dark yellow solution obtained was concentrated to dryness under reduced pressure and the crystalline residue was recrystallized from ethanol. There were obtained 2.3 g of 4-amino-N,1-dimethyl-2-oxo-3-pentenesulfonamide in the form of colorless crystals, m.p. 140°-143°.

1. waitthe mixture was thereupon left
2. customThe dark yellow solution obtained
3. concentrationwas concentrated to dryness under reduced pressure
4. customthe crystalline residue was recrystallized from ethanol