[Br:1][C:2]1[CH:7]=[C:6](F)[CH:5]=[CH:4][C:3]=1[N+:9]([O-:11])=[O:10].[NH:12]1[CH2:16][CH2:15][C@H:14]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:23])([CH3:22])[CH3:21])[CH2:13]1.C(=O)(O)[O-].[Na+].O>CS(C)=O>[Br:1][C:2]1[CH:7]=[C:6]([N:12]2[CH2:16][CH2:15][C@H:14]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:22])([CH3:21])[CH3:23])[CH2:13]2)[CH:5]=[CH:4][C:3]=1[N+:9]([O-:11])=[O:10]A solution of 2-bromo-4-fluoro-1-nitrobenzene (1.5 g, 6.8 mmol), (S)-tert-butyl pyrrolidin-3-ylcarbamate (1.9 g, 10 mmol), and sodium bicarbonate (1.7 g, 20 mmol) in DMSO (40 mL) was heated at 80° C. for 1 h. The reaction mixture was cooled to room temperature, poured into excess water and the resulting precipitate was filtered. The solids were washed with aqueous ammonium chloride, brine and water to afford the desired product (2.5 g, 96%) as a yellow solid: 387 [C15H20BrN3O4+H]+.
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