反应详情

3-Nitro-5-(trifluoromethyl)benzoic acid (25.0 g, 106.3 mmol) was dissolved in methanol (60 mL) which was bubbled with hydrochloric acid gas for 1 h. The reaction was allowed to stir at room temperature overnight and concentrated. The crude product was dissolved in ethyl acetate, washed with water (2×), brine (2×) dried over sodium sulfate and concentrated. Flash chromatography on silica gel afforded 23.4 g (88%) of the desired compound. 1H-NMR (CDCl3, 500 MHz) δ 9.02 (s, H), 8.66 (s, 1H), 8.61 (s, 1H), 4.03 (s, 3H).

1. customwas bubbled with hydrochloric acid gas for 1 h
2. concentrationconcentrated
3. dissolutionThe crude product was dissolved in ethyl acetate
4. washwashed with water (2×), brine (2×)
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated