Cl.[Sn](Cl)Cl.[F:5][C:6]1[CH:11]=[CH:10][C:9]([N:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)=[C:8]([N+:18]([O-])=O)[CH:7]=1.C(=O)(O)[O-].[Na+]>CO>[F:5][C:6]1[CH:11]=[CH:10][C:9]([N:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)=[C:8]([CH:7]=1)[NH2:18]
Concentrated hydrochloric acid (1.20 ml, 14.4 mmol) and anhydrous tin dichloride (1.22 g, 6.43 mmol) were sequentially added at 0° C. to a methanol (5 ml) solution of 1-(4-fluoro-2-nitrophenyl)piperidine (289 mg, 1.28 mmol), obtained as described in Referential Example 17-1. The resulting mixture was warmed to room temperature and stirred for 21 hours. A saturated aqueous solution of sodium bicarbonate was added to the mixture. The mixture was extracted three times with ethyl acetate. The obtained organic layer was washed with a saturated sodium chloride solution, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (25 g, hexane/ethyl acetate=12/1). Thus, 5-fluoro-2-(1-piperidinyl)aniline (250 mg, quant.) was yielded as a colorless oily material.
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