反应详情

温度

80 °C

4-(4-(Trifluoromethyl)phenyl)pyridine-1-oxide (1.9 g, 7.9 mmol) was heated to 140° C. in acetic anhydride (80 mL) for 5 h. The mixture was concentrated and then heated at 80° C. for 1 h in a mixture of MeOH (20 mL) and aqueous 1 N NaOH (15 mL). The resulting black solution was concentrated to a volume of 15 mL, and the solid was filtered off, rinsed with CH2Cl2 and dried under vacuum to provide the title compound (1.26 g, 66%) as a brown solid: 1H NMR (300 MHz, CD3OD) δ 7.80-7.74 (br m, 5H), 6.85-6.66 (br m, 2H).

1. concentrationThe mixture was concentrated
2. concentrationThe resulting black solution was concentrated to a volume of 15 mL
3. filtrationthe solid was filtered off
4. washrinsed with CH2Cl2
5. customdried under vacuum