反应详情

温度

80 °C

6-Methoxy-2,2,4-trimethyl-7-nitro-2H-benzo[b][1,4]oxazin-3(4H)-one (250 mg, 0.94 mmol) was stirred in ethanol (15 mL) then tin (II) chloride was added. The reaction was heated to 80° C. with stirring for 2 h. The volatiles were removed under reduced pressure and the residue was slurried with 2M sodium hydroxide aqueous solution. The aqueous was extracted with ethyl acetate and the combined organic extracts were passed through a phase separation cartridge and evaporated, to afford a brown crystalline solid (220 mg, 99%) which was taken through to the next step with no further purification.

1. customThe volatiles were removed under reduced pressure
2. extractionThe aqueous was extracted with ethyl acetate
3. customthe combined organic extracts were passed through a phase separation cartridge
4. customevaporated