反应详情

温度

70 °C

To a solution of 4-chloro-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-2-ylamine (317 mg, 0.998 mmol, prepared as described in the Example 1) in MeOH (5 mL) was added NaOMe (1.99 mL, 0.998 mmol, 0.5 M solution in MeOH). The resulting mixture was stirred at 70° C. overnight. The reaction mixture was then diluted with water (20 mL) and extracted with EtOAc (3×10 mL). The organic layers were combined, dried (MgSO4) and concentrated. The resulting residue was purified on silica 0:100-50:50 EtOAc-hexanes to yield 4-methoxy-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-2-ylamine. 1H-NMR (400 MHz, CDCl3) δ: 7.78 (d, J=7.8 Hz, 1H), 7.61-7.67 (m, 1H), 7.54-7.60 (m, 1H), 7.50 (d, J=7.6 Hz, 1H), 6.46 (s, 1H), 6.27 (br. s., 2H), 3.97 (s, 3H).

1. extractionextracted with EtOAc (3×10 mL)
2. dry with materialdried (MgSO4)
3. concentrationconcentrated
4. customThe resulting residue was purified on silica 0:100-50:50 EtOAc-hexanes