Sulfuric Acid → 4-Fluoro-2-methoxy-5-nitroaniline

Beteiligte Stoffe

Reaktionsschritte

4-Fluoro-2-methoxyaniline (2.4 g, 17.00 mmol) was added portionwise to concentrated H2SO4 (15 mL) which was cooled in a ice/water bath, and where the temperature was kept below 15° C. during the addition. The mixture was stirred until all the solid that formed had dissolved. KNO3 (0.815 mL, 17.00 mmol) was added portionwise such that the temperature was maintained below 10° C. The mixture was stirred overnight and then poured onto ice/water. The mixture was basified with concentrated NH4OH. The resulting solid was filtered off and then dissolved in CH2Cl2, washed with water, dried (Na2SO4) and concentrated onto silica. Purification by FCC, eluting with 50-0% heptane in CH2Cl2 gave the title compound (2.450 g, 77%) as a yellow crystalline solid; 1H NMR: 3.91 (3H, s), 5.21 (2H, s), 7.03 (1H, d), 7.35 (1H, d); m/z: ES+ MH+ 187.4.

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