[N+:1]([C:4]1[C:5]([O:14][CH:15]([C:20]2[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=2)[C:16]([F:19])([F:18])[F:17])=[N:6][C:7]2[C:12]([CH:13]=1)=[CH:11][CH:10]=[CH:9][CH:8]=2)([O-])=O.O.O.[Sn](Cl)(Cl)(Cl)Cl.C(=O)(O)[O-].[Na+]>C(O)C>[F:19][C:16]([F:17])([F:18])[CH:15]([C:20]1[CH:21]=[N:22][CH:23]=[CH:24][CH:25]=1)[O:14][C:5]1[C:4]([NH2:1])=[CH:13][C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[N:6]=13-Nitro-2-[2,2,2-trifluoro-1-(pyridin-3-yl)ethoxy]quinoline (253 mg, 0.720 mmol) obtained in Step 3 was dissolved in ethanol (12.7 mL). To this, tin chloride dihydrate (817 mg, 3.62 mmol) was added and the mixture was stirred at 90° C. for 1 hour. By addition of an aqueous sodium bicarbonate solution to neutralize the reaction mixture, the reaction was stopped. Then, extraction with ethyl acetate was performed, followed by washing with brine and drying over anhydrous magnesium sulfate. The solvent was evaporated off under reduced pressure, and the residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/0 to 3/1) to give Compound HF (182 mg, yield: 79%).
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