反应详情

A mixture of 4-bromo-2-fluoro-1-nitro-benzene (9 g, 40 mmol), sarcosine (3.6 g, 40 mmol), and potassium carbonate (5.5 g, 40 mmol) in ethanol (100 ml) and water (40 ml) was heated to reflux for 5 hours. After cooling to room temperature, the mixture was diluted with water and was adjusted to pH 6 with 1N aqueous HCl solution. The yellow precipitate was collected, washed with water and dried in vacuo to obtain crude [(5-bromo-2-nitro-phenyl)-methyl-amino]-acetic acid (10 g, 87%). A portion of the crude sample was recrystallized from EtOAc/hexane to afford the pure [(5-bromo-2-nitro-phenyl)-methyl-amino]-acetic acid: mp 152-155° C.; 1H-NMR (DMSO-d6) δ2.81 (s, 3H), 4.00 (s, 2H), 7.06 (dd, 1H, J=8.79, 1.98 Hz), 7.22 (d, 1H, J=1.98 Hz), 7.69 (d, 1H, J=8.79 Hz), 12.8 (s, 1H); MS (+APCI) m/z 289/291 (M+H)+.

1. temperaturewas heated
2. temperatureto reflux for 5 hours
3. customThe yellow precipitate was collected
4. washwashed with water
5. customdried in vacuo