Nitromethane → 5-((E)-2-Nitro-vinyl)-2-phenoxy-pyridine

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A mixture of 6-phenoxy-pyridine-3-carbaldehyde described in Manufacturing Example 232-1-2 (4.75 g, 23.8 mmol), nitromethane (6.45 mL, 119 mmol), ammonium acetate (3.67 g, 47.6 mmol) and acetic acid (20 mL) was stirred for 3 hours at 100° C. This mixture was cooled to room temperature, and partitioned into ethyl acetate and water. The organic layer was separated, washed with water, dried over anhydrous magnesium sulfate, and then filtered. The filtrate was concentrated under a reduced pressure to obtain the title compound (5.97 g) as a crude product.

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