反应详情

A mixture of methyl 4-ethoxy-5-methoxy-2-nitrobenzoate (8.38 g, 32.8 mmol) and Pd/C (10%, 0.85 g) in MeOH (20 mL) was stirred under 1 atmosphere of hydrogen at room temperature for 6 hours. The reaction mixture was filtered with Celite and washed with MeOH. The filtration was concentrated under reduced pressure to give methyl 2-amino-4-ethoxy-5-methoxybenzoate as solid (6.832 g, 92%). 1H NMR (300 MHz, CDCl3) δ 7.30 (s, 1H), 6.13 (s, 1H), 5.56 (br, 2H), 4.08 (q, 2H), 3.85 (s, 3H), 3.82 (s, 3H), 1.48 (t, 3H); LC-MS (ESI) m/z 226 (M+H)+.

1. filtrationThe reaction mixture was filtered with Celite
2. washwashed with MeOH
3. filtrationThe filtration
4. concentrationwas concentrated under reduced pressure