反应详情

温度

50 °C

According to the procedure described in Example 6A Step 2, to a solution of methyl 4-methoxy-3-(2-methoxyethoxyl)benzoate (5.6 g, 23.3 mmol) and Ac2O (12 mL) in AcOH (60 mL) was dropped fuming nitric acid (90%, 4 mL). The reaction was heated at 50° C. for 3 hours, and the residue was purified by silica gel chromatography with 0-15% EtOAc/hexane as eluants to afford methyl 4-methoxy-5-(2-methoxyethoxy)-2-nitrobenzoate as a solid (3.67 g, 56%). 1H NMR (300 MHz, DMSO-d6) δ 7.64 (s, 1H), 7.34 (s, 1H), 4.26 (m, 2H), 3.91 (s, 3H), 3.82 (s, 3H), 3.68 (m, 2H), 3.33 (s, 3H).

1. customthe residue was purified by silica gel chromatography with 0-15% EtOAc/hexane as eluants