[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[N:8]1[C:12](=[O:13])[CH2:11][C:10]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=2[F:20])=[N:9]1.C(N(CC)CC)C.C(NC1C=CC(S([N:41]=[N+:42]=[N-])(=O)=O)=CC=1)(=O)C.C(=O)([O-])[O-].[Na+].[Na+].[OH-].[Na+]>C(#N)C>[N+:41](=[C:11]1[C:10]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=2[F:20])=[N:9][N:8]([C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=2[F:1])[C:12]1=[O:13])=[N-:42]2,5-Bis(2-fluorophenyl)-2,4-dihydro-3H-pyrazol-3-one (0.63 g, 2.3 mmol) was suspended in acetonitrile (10 mL), treated with triethylamine (0.27 mL, 2.7 mmol, 1.15 equiv) and cooled to 0° C. To the mixture was added 4-acetamidobenzenesulfonyl azide (0.61 g, 2.5 mmol, 1.1 equiv) and after 30 minutes at 0° C., the mixture was warmed to ambient temperature. After stirring for 30 minutes, the mixture was poured into sodium carbonate (25 mL, aqueous saturated) and sodium hydroxide (10 mL, 1 N aqueous) and extracted with dichloromethane (2×125 mL). The combined organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel gradient chromatography (100:0 to 0:100; hexanes:ethyl acetate), providing the titled compound.
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