反应详情

A solution of 2',5'-difluoro-4'-nitroacetanilide (20.0 g, 0.093 mol) and o-anisidine (17.1 g, 0.139 mol) in dioxane is refluxed overnight, treated with additional o-anisidine (5.7 g), refluxed for 5 hours, treated with additional o-anisidine (5.7 g), refluxed for 5 days, treated with N,N-dimethylformamide (50 mL), refluxed overnight, cooled to room temperature and poured into water. The resultant aqueous mixture is extracted with ethyl acetate. The organic extracts are combined, washed sequentially with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a red oil. Flash column chromatography of the oil using silica gel and a 5% ethyl acetate in methylene chloride solution gives the title product as a brown solid which is identified by NMR spectral analyses.

1. temperaturerefluxed for 5 hours
2. temperaturerefluxed for 5 days
3. temperaturerefluxed overnight
4. extractionThe resultant aqueous mixture is extracted with ethyl acetate
5. washwashed sequentially with water and brine
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated in vacuo
8. customto obtain a red oil