反应详情

温度

60 °C

Step 1): A solution of 4,5-diphenylimidazole (2.5 g, 11.3 mmol) in dry DMF (20 ml) was added to a suspension of NaH (0.33 g, 13.8 mmol) in dry DMF (5 ml) at 50° C. under nitrogen atmosphere. The reaction mixture was heated at 60° C. for 2 hours. After heating, the mixture was added dropwise to a solution of 1-bromo-2-chloroethane (4.9 g, 33.9 mmol) in dry DMF (30 ml) over 1 hour at 50° C. The reaction mixture was heated continuously at 40° C. for 5 hours, then poured into water and extracted with ethyl acetate. The organic layer was washed with water, dried (MgSO4) and concentrated. The precipitates were filtered off. The filtrate was concentrated. The residue was purified by column chromatography on silica gel (ethyl acetate and hexane) to give 1-(2-chloroethyl)-4,5-diphenylimidazole (17.7%).

1. temperatureAfter heating
2. temperatureThe reaction mixture was heated continuously at 40° C. for 5 hours
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with water
5. dry with materialdried (MgSO4)
6. concentrationconcentrated
7. filtrationThe precipitates were filtered off
8. concentrationThe filtrate was concentrated
9. customThe residue was purified by column chromatography on silica gel (ethyl acetate and hexane)