反应详情

温度

50 °C

To a solution of 2-methyl-5-(methyloxy)aniline (Intermediate 11, 6.0 g) in H2SO4 (5 M, 20 mL) was added portionwise NaNO2 (3.4 g, 49.3 mmol) at 0-5° C. The mixture was stirred at 50° C. for 1 hour and extracted with ethyl acetate (4 times 30 mL). The combined ethyl acetate layers were dried over sodium sulphate and concentrated under vacuum to give a residue, which was purified by column chromatography on silica gel (with EtOAc:PE=1:20 as eluents) to afford the title compound as a solid.

1. extractionextracted with ethyl acetate (4 times 30 mL)
2. dry with materialThe combined ethyl acetate layers were dried over sodium sulphate
3. concentrationconcentrated under vacuum
4. customto give a residue, which
5. customwas purified by column chromatography on silica gel (with EtOAc:PE=1:20 as eluents)