反应详情

To a solution of 4,5-dibromo-2-methylimidazole (3.0 g, 12.5 mmol) in 25 mL DMF add sodium carbonate (2.0 g, 18.8 mmol) and benzyl bromide (1.64 mL, 13.8 mmol). Stir the solution at room temperature for 72 hours. Pour the reaction into water and extract with EtOAc. Wash the organic layer with water, saturated aqueous sodium chloride, and dry over sodium sulfate. Filter the mixture and concentrate to 3.8 g crude oil. Purify the oil by radial chromatography eluting with 40% EtOAc in hexanes. Concentrate the appropriate fractions to 3.1 g (75%) of the title compound as a colorless oil. MS(ES+): m/z=331.0 (M+H)+

1. additionPour
2. extractionextract with EtOAc
3. washWash the organic layer with water, saturated aqueous sodium chloride
4. dry with materialdry over sodium sulfate
5. filtrationFilter the mixture
6. concentrationconcentrate to 3.8 g crude oil
7. customPurify the oil by radial chromatography
8. washeluting with 40% EtOAc in hexanes
9. concentrationConcentrate the appropriate fractions to 3.1 g (75%) of the title compound as a colorless oil