[CH3:1][C:2]1[CH:7]=[CH:6][C:5](OS(C(F)(F)F)(=O)=O)=[C:4]([N+:16]([O-:18])=[O:17])[CH:3]=1.[F:19][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][C:21]=1[SH:26].C([O-])([O-])=O.[Na+].[Na+]>CCO>[F:19][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][C:21]=1[S:26][C:5]1[CH:6]=[CH:7][C:2]([CH3:1])=[CH:3][C:4]=1[N+:16]([O-:18])=[O:17]The product from Example 4a (1.50 g, 5.3 mmol) and 2-fluorobenzenethiol (0.56 mL, 5.3 mmol) in EtOH (15 mL) was added aqueous Na2CO3 solution (0.563 g, 5.3 mmol) dropwise at room temperature. The mixture was heated to reflux fluxed for 1 hour, and then evaporated. The residue was diluted with EtOAc, washed with H2O, 5% KOH and brine, dried over MgSO4, filtered and concentrated under vacuum giving the title compound as yellow crystal, which was purified by washing with cold n-hexane to give the title product as yellow crystal (1.15 g, 83%).
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