反应详情

2-Amino-5,5-dimethyl-5,6-dihydro-4H-benzothiazol-7-one (40.5 g, 0.206 mol) and Ac2O (400 mL) are heated at 100° C. for 4 h. After cooling to RT, the reaction mixture is concentrated in vacuo. The precipitated solid is collected by filtration and affords N-(5,5-dimethyl-7-oxo-4,5,6,7-tetrahydro-benzothiazol-2-yl)-acetamide (36.5 g, 75% yield).

1. concentrationthe reaction mixture is concentrated in vacuo
2. filtrationThe precipitated solid is collected by filtration