[Br:1][C:2]1[C:3](F)=[C:4]([CH:7]=[C:8]([N+:10]([O-:12])=[O:11])[CH:9]=1)[CH:5]=[O:6].C(=O)([O-])[O-].[K+].[K+].[CH3:20][C:21]([SH:24])([CH3:23])[CH3:22].O>CN(C=O)C>[Br:1][C:2]1[C:3]([S:24][C:21]([CH3:23])([CH3:22])[CH3:20])=[C:4]([CH:7]=[C:8]([N+:10]([O-:12])=[O:11])[CH:9]=1)[CH:5]=[O:6]A mixture of 3-bromo-2-fluoro-5-nitro-benzaldehyde (1.0 g, 4 mmol), potassium carbonate (667 mg, 4.8 mmol) and 2-methyl-2-propanethiol (326 mg, 0.40 mL, 3.6 mmol) in dry DMF (5 mL) was heated at 110° C. in a sealed tube for 16 h. The reaction was cooled to RT, water was added, and the mixture extracted with dichloromethane (2×30 mL). The combined organic fractions were washed with water (3×15 mL), dried over sodium sulfate, filtered and concentrated to afford 1.2 g of the crude title compound, which was used without further purification.
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