反应详情

温度

90 °C

A mixture of 3-(benzyloxy)-6-methoxy-2-nitrobenzamide (10, 0.34 g. 1.1 mmol), iron powder (0.44 g, 7.7 mmol) and concentrated hydrochloric acid (80 mL) in EtOH (4 mL)/water (0.4 mL) was heated at 90° C. for 75 min. The reaction mixture was cooled to room temperature, filtered through Celite and concentrated. The residue was dissolved in EtOAc washed with saturated NaHCO3 solution, dried over Na2SO4, filtered, and concentrated. Purification by silica gel chromatography eluting with 0-10% MeOH in CH2Cl2 afforded the title compound along with its regioisomer (0.267 g, 87%) as a tan solid: 1H NMR (500 MHz, CDCl3) δ 7.83 (br s, 1H), 7.47-7.32 (m, 5H), 6.77 (d, J=8.8 Hz, 1H), 6.60 (br s, 2H), 6.06 (d, J=8.8 Hz, 1H), 5.51 (br s, 1H), 5.04 (s, 2H), 3.85 (s, 3H).

1. temperatureThe reaction mixture was cooled to room temperature
2. filtrationfiltered through Celite
3. concentrationconcentrated
4. dissolutionThe residue was dissolved in EtOAc
5. washwashed with saturated NaHCO3 solution
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated
9. customPurification by silica gel chromatography
10. washeluting with 0-10% MeOH in CH2Cl2