Ammonium Chloride → 3-(Trifluoromethoxy)pyridin-2-amine
反応式
[N+:1]([C:4]1[C:9]([O:10][C:11]([F:14])([F:13])[F:12])=[CH:8][CH:7]=[CH:6][N:5]=1)([O-])=O.[Cl-].[NH4+]>C(O)C.[Fe]>[F:14][C:11]([F:12])([F:13])[O:10][C:9]1[C:4]([NH2:1])=[N:5][CH:6]=[CH:7][CH:8]=1参加物
5
反応条件
- 温度
- 70 °C
実験手順
To a stirred solution of 2-nitro-3-(trifluoromethoxy)pyridine (370 mg, 1.78 mmol) in ethanol (5 mL) were added aqueous ammonium chloride (951 mg, 17.78 mmol, in 10 mL of water) and iron powder (993 mg, 17.78 mmol). The reaction mixture was heated to 70° C. for 2 h. After cooling down the reaction mixture was filtered and the solid was washed with ethyl acetate. The mother liquid was concentrated to dryness in vacuo. The residue was diluted with water and extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate and concentrated to dryness in vacuo. The residue was used in next step directly without further purification (250 mg, 79%): 1H NMR (400 MHz, DMSO-d6) δ 7.93-7.91 (m, 1H), 7.48-7.46 (m, 1H), 6.59-6.56 (m, 1H), 6.35 (brs, 2H).