反应详情

温度

60 °C

Into a 250 mL round bottomed flask charged with 4-bromo-6-nitro-1H-benzo[d]imidazole (5 g, 20.66 mmol) in N,N-Dimethylformamide (DMF) (100 mL) was added 1-(bromomethyl)-3-chloro-2-methylbenzene (6.80 g, 31.0 mmol) and potassium carbonate (8.57 g, 62.0 mmol The resulting reaction mixture was stirred 1 h at 60° C., cooled to room temperature and poured into water, extracted with ethyl acetate, washed with water, brine, dried (MgSO4) and evaporated. The residue was purified on a silica gel cartridge and eluted with a gradient of 0% ethyl acetate/hexanes to 80% over 10 column volumes. The expected compound was collected and evaporated to yield 4-bromo-1-(3-chloro-2-methylbenzyl)-6-nitro-1H-benzo[d]imidazole (3.05 g, 8.01 mmol, 38.8% yield) as a tan solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 2.40 (s, 3H) 5.79 (s, 2H) 6.61 (d, J=7.58 Hz, 1H) 7.16 (t, J=7.83 Hz, 1H) 7.42 (d, J=7.58 Hz, 1H) 8.34 (d, J=2.02 Hz, 1H) 8.65 (d, J=2.02 Hz, 1H) 8.73 (s, 1H); LC/MS: MS (ES+) m/e 381 [M+H]+.

1. customThe resulting reaction mixture
2. temperaturecooled to room temperature
3. extractionextracted with ethyl acetate
4. washwashed with water, brine
5. dry with materialdried (MgSO4)
6. customevaporated
7. customThe residue was purified on a silica gel cartridge
8. washeluted with a gradient of 0% ethyl acetate/hexanes to 80% over 10 column volumes
9. customThe expected compound was collected
10. customevaporated