反应详情

A solution of methyl 2-[p-(5-acetamido-2-amino-4-fluoroanilino)phenoxy]propionate (7 g, 0.019 mol) in tetrahydrofuran is added dropwise to a 50% acetic acid solution at 0° C. To the resultant mixture, a solution of sodium nitrite (2.81 g, 0.041 mol) in water is added dropwise. After the addition is complete, the reaction mixture is warmed to room temperature, stirred for 3 days and poured into water. The aqueous mixture is extracted with ethyl acetate. The organic extracts are combined, washed sequentially with brine and water, dried over anhydrous sodium sulfate and concentrated in vacuo to give the title product as an orange solid which is identified by NMR spectral analyses.

1. additionAfter the addition
2. extractionThe aqueous mixture is extracted with ethyl acetate
3. washwashed sequentially with brine and water
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo