反应详情

To a suspension of 3.15 g of sodium hydride (60% in mineral oil, 78.8 mmol) in 70 mL of DMF at 0° C. was added 9.76 g (75 mmol) of 2,4-thiazolidinedione portion-wise. The reaction mixture was stirred for 20 minutes, then 17.5 g of 2-bromo-4′-chloroacetophenone (75 mmol) was added. The reaction was allowed to warm to room temperature and stirred for 5 hours. Ethyl acetate and water were added, the organic phase was separated, and washed with water and brine. The combined aqueous extracts were washed with additional ethyl acetate which was then washed with water and brine and combined with the rest of the organic layer. The ethyl acetate phases were dried over magnesium sulfate, filtered and stripped to give 23 g of crude product. Recrystallization from 1:1 toluene:hexane gave 16.25 g of 3-(2-(4-chlorophenyl)-2-oxo-ethyl)-thiazolidine-2,4-dione, (85% yield) mp 122–124° C.

1. stirringstirred for 5 hours
2. customthe organic phase was separated
3. washwashed with water and brine
4. washThe combined aqueous extracts were washed with additional ethyl acetate which
5. washwas then washed with water and brine
6. dry with materialThe ethyl acetate phases were dried over magnesium sulfate
7. filtrationfiltered
8. customto give 23 g of crude product
9. customRecrystallization from 1:1 toluene