反应详情

A stirred solution of 1-(2,4-dichlorophenyl)-2-chloroethan-1-one (0.95 M) and imidazole (2.68 M) in CH3CN (500 ml) were heated for 14-16 hours at 75° C. The product was stripped of solvent under reduced pressure. The residue was diluted with dichloromethane (1 L) and water (400 ml), and the mixture was stirred for 30 min. After filtering off a solid impurity, the aqueous layer was removed and discarded. The organic layer was washed sequentially with water (300 ml), sat. aq. NaHCO3 (300 ml), water (300 ml), brine (200 ml), dried with Na2SO4, filtered, and concentrated under reduced pressure. The reddish black oil was dried overnight in vacuo giving 1-(2,4-dichlorophenyl)-2-imidazolylethan-1-one in 90% yield.

1. filtrationAfter filtering off a solid impurity
2. customthe aqueous layer was removed
3. washThe organic layer was washed sequentially with water (300 ml), sat. aq. NaHCO3 (300 ml), water (300 ml), brine (200 ml)
4. dry with materialdried with Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe reddish black oil was dried overnight in vacuo