反应详情

To a stirred solution of 2-acetylamino-4-nitrobenzoic acid (1.28 g, 5.71 mmol) in benzene-MeOH (4:1, v/v, 25 mL), was added trimethylsilyldiazomethane (2.0 M solution in n-hexane, 4.28 ml, 8.56 mmol) at 0° C. The stirring was continued for 18 hours at rt. The reaction was poured into hexane, and the resulting precipitate was collected by filtration to give methyl 2-acetylamino-4-nitrobenzoate (1.32 g, 97%) as a white solid; mp no data; 1H-NMR (400 MHz, CDCl3) δ 2.30 (s, 3 H), 4.00 (s, 3 H), 7.88 (m, 1 H), 8.18 (dd, J=2.0 Hz, 8.8 Hz, 1 H), 9.60 (t, J=2.2 Hz, 1 H), 11.10 (s, 1 H); MS (ESI) m/z 238 (M+).

1. filtrationthe resulting precipitate was collected by filtration