[F:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([O:8][CH2:9][C:10]2[CH:17]=[CH:16][C:13]([CH:14]=O)=[CH:12][CH:11]=2)[CH:3]=1.[N+:18]([CH3:21])([O-:20])=[O:19].C([O-])(=O)C.[NH4+]>C(O)(=O)C>[F:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([O:8][CH2:9][C:10]2[CH:17]=[CH:16][C:13](/[CH:14]=[CH:21]/[N+:18]([O-:20])=[O:19])=[CH:12][CH:11]=2)[CH:3]=1A mixture of the 4-(4-fluoro-pyridine-2-yloxymethyl)-benzaldehyde (1.5 g, 6.49 mmol) described in Manufacturing Example 59-1-2, nitromethane (698 μL, 13 mmol), ammonium acetate (750 mg, 9.74 mmol) and acetic acid (15 mL) was stirred for 6 hours at 100° C. This mixture was cooled to room temperature, concentrated under a reduced pressure, and diluted with ethyl acetate. The organic layer was washed with water, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure to obtain the title compound (1.72 g).
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