反应详情

温度

120 °C

2-Fluoro-5-nitroaniline (6, 10.22 g, 65.5 mmol, 1.0 equiv.) was dissolved in anhydrous DMSO (100 ml) and treated with neopentylamine (1-2) (7.71 ml, 65.5 mmol, 1.0 equiv.). The reaction mixture was heated at 120° C. for 2 days, cooled to room temperature and treated with acetic acid (25 ml), followed by addition of 2.0 M aqueous solution of sodium nitrite (121 ml, 79 mmol, 1.2 equiv.). LCMS showed product after the reaction mixture was stirred at ambient temperature for 20 minutes. The mixture was then neutralized to pH=7 with NaOH (1N) and diluted with water which caused precipitation. The solid was collected on top of filter and washed twice with water. The crude solid was purified with normal phase silica gel chromatography (EtOAc/Hexane gradient from 0 to 100%) to yield 1-(2,2-dimethylpropyl)-5-nitro-1H-1,2,3-benzotriazole (8). 1H NMR δ (CDCl3): 9.02 (d, 1H, J=2.0 Hz), 8.40 (dd, 1H, J=9.1, 2.0 Hz), 7.62 (d, 1H, J=9.1 Hz), 4.47 (s, 2H), 1.07 (s, 9H) ppm. LRMS m/z (M+H) 235.1 found, 235.3 required.

1. temperaturecooled to room temperature
2. customprecipitation
3. customThe solid was collected on top
4. filtrationof filter
5. washwashed twice with water
6. customThe crude solid was purified with normal phase silica gel chromatography (EtOAc/Hexane gradient from 0 to 100%)