反应详情

5-Benzyl-3-(2,5-difluorophenyl)imidazolidine-2,4-dione (2.0 g, 6.62 mmol) in DMF (10 mL) was added dropwise to a suspension of sodium hydride (166 mg, 6.95 mmol) in DMF (5 mL) at 0° C. The solution was stirred for 1 hour; then methyl iodide (0.62 mL, 9.9 mmol) was added and the mixture was stirred for 5 hours, then diluted with water and extracted with ethyl acetate (3×). The combined extracts were washed with brine (saturated), dried (over MgSO4), filtered and concentrated to give 1.19 grams of 5-benzyl-3-(2,5-difluorophenyl)-1-methylimidazolidine-2,4-dione, as an oil (compound 1 under Table A).

1. stirringthe mixture was stirred for 5 hours
2. extractionextracted with ethyl acetate (3×)
3. washThe combined extracts were washed with brine (saturated)
4. dry with materialdried (over MgSO4)
5. filtrationfiltered
6. concentrationconcentrated