反应详情

温度

50 °C

2-n-Butylimidazole (9.7 g, 0.078 mol) was dissolved in methanol (50 mL) and added dropwise to a solution of sodium methoxide [from sodium hydride (2.31 g, 0.0934 mol) in methanol (250 mL)]. After one hour, the solution was evaporated to dryness, and the sodium salt was taken up in dry dimethylformamide (150 mL), and 2-chlorobenzyl bromide (16.3 g, 0.079 mol) was added. The mixture was heated at 50° C. for 17 hours under argon, poured onto ice water, and the product was extracted into ethyl acetate. The extract was washed, dried, and concentrated to give 18.5 g of crude product which was flash chromatographed over silica gel with 2:1 hexane/ethyl acetate to provide 11.9 g (61%) of 2-n-butyl-1-(2-chlorophenyl)methyl-1H-imidazole as an oil. Thin layer chromatography on silica gel with 4:1 hexane/ethyl acetate gave an Rf value of 0.59.

1. customthe solution was evaporated to dryness
2. additionpoured onto ice water
3. extractionthe product was extracted into ethyl acetate
4. washThe extract was washed
5. customdried
6. concentrationconcentrated
7. customto give 18.5 g of crude product which
8. customchromatographed over silica gel with 2:1 hexane/ethyl acetate