[K].[S:2]1[CH2:6][C:5](=[O:7])[NH:4][C:3]1=[O:8].Br[CH2:10][C:11]([C:13]1[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][CH:14]=1)=[O:12]>CC(C)=O>[N+:19]([C:16]1[CH:15]=[CH:14][C:13]([C:11](=[O:12])[CH2:10][N:4]2[C:5](=[O:7])[CH2:6][S:2][C:3]2=[O:8])=[CH:18][CH:17]=1)([O-:21])=[O:20]A little at a time, 1.3 g (8.4 mmol) of 1,3-thiazolidine-2,4-dione potassium salt were added to a solution of 2.0 g (8.2 mmol) of 2-bromo-1-(4-nitrophenyl)ethanone in 80 ml of acetone, and the mixture was stirred at 60° C. for 1 h. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in water/dichloromethane. After phase separation, the organic phase was dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. Yield: 2.3 g (98% of theory)
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