反应详情

温度

70 °C

3-(3-Fluoro-4-methylphenyl)-1,2,4-oxadiazole (101.8 g, 0.57 mol) and N-bromosuccinimide (206 g, 1.16 mol) were dissolved in acetonitrile (˜1 L) and azobisisobutyronitrile (4.2 g, 26 mmol) was added at room temperature. The mixture was heated to 70° C. for 2 hours at which point HPLC showed complete conversion of the starting material to a mixture of the monobromide and dibromide. The mixture was cooled to 0° C. and diisopropyl ethyl amine (73 mL, 54.2 g, 0.42 mol) was added while maintaining the reaction temperature below 5 C. Diethyl phosphite (54.7 mL, 58.6 g, 0.42 mol) was added slowly and the reaction mixture was warmed to room temperature. After 2 hours HPLC showed complete conversion of the dibromide to the monobromide. Water (1.2 L) was added and the resulting precipitate was filtered. Washing with water (2×200 mL) and drying provided 3-(4-(bromomethyl)-3-fluorophenyl)-1,2,4-oxadiazole (135 g, 92% yield).

1. temperatureThe mixture was cooled to 0° C.
2. temperaturewhile maintaining the reaction temperature below 5 C
3. temperaturethe reaction mixture was warmed to room temperature
4. filtrationthe resulting precipitate was filtered
5. washWashing with water (2×200 mL)
6. customdrying