反应详情

2-Amino-3-iodo-4-methylbenzoic acid (10 g, 36 mmol) was treated with acetic anhydride (70 mL) and the mixture stirred at reflux for 4 h. The reaction was allowed to cool down to RT and placed in an ice bath for ˜2 h. The resulting precipitate was collected by filtration, washed with diethyl ether and dried to give 8-iodo-2,7-dimethyl-4H-benzo[d][1,3]oxazin-4-one (8.9 g, 82%) as a tan solid. MS (M+H)+ 302.

1. temperatureat reflux for 4 h
2. filtrationThe resulting precipitate was collected by filtration
3. washwashed with diethyl ether
4. customdried