反应详情

温度

80 °C

4-(4-(Trifluoromethyl)benzyloxy)pyridine 1-oxide (600 mg, 2.22 mmol) was heated to 140° C. in acetic anhydride (20 mL) for 2 h. The mixture was concentrated and then heated at 80° C. for 1 h in a mixture of MeOH (10 mL) and aqueous 1 N NaOH (10 mL). The resultant black solution was concentrated to a volume of 10 mL and extracted with CHCl3/EtOH (3:1). The organic layer was removed and concentrated to provide the title compound (550 mg, 91%) as a tan solid: 1H NMR (300 MHz, CD3OD) δ 7.70-7.60 (m, 4H), 7.41 (d, J=7.0 Hz, 1H), 6.17 (dd, J=7.0, 2.5 Hz, 1H), 5.96 (d, J=2.4 Hz, 1H), 5.18 (s, 2H).

1. concentrationThe mixture was concentrated
2. concentrationThe resultant black solution was concentrated to a volume of 10 mL
3. extractionextracted with CHCl3/EtOH (3:1)
4. customThe organic layer was removed
5. concentrationconcentrated