反应详情

5-Bromo-2-fluorobenzyl bromide (8.0 g, 0.03 mole) was dissolved in 1,4-Dioxane (60 mL) and added to a solution of KCN (2.04 g, 0.031 mole) in H2O (20 mL) and ethanol ( 20 mL). The resulting mixture was heated under reflux for 5 h. After cooling to rt, the product was extracted with ether ( 200 mL), washed with brine, dried over MgSO4, concentrated. Crystallized from ether/hexane to give 5-bromo-2-fluorophenylacetonitrile as a white crystalline material (5.6 g, 88%): mp 55-58° C.; 1H NMR (DMSO-d6) □4.07 ( s, 2H), 7.29( t, 1H,J=9.23 Hz), 7.60-7.69( m, 2H); MS(EI) M+. m/z 213 ; Anal. Calc. For C8H5Br2FN: C, 44.89, H, 2.35, N, 6.54. Found: C, 44.90, H, 2.24, N, 6.43.

1. temperatureThe resulting mixture was heated
2. temperatureunder reflux for 5 h
3. extractionthe product was extracted with ether ( 200 mL)
4. washwashed with brine
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. customCrystallized from ether/hexane