Acetic Acid → 2-Benzyloxy-5-(2-nitro-ethyl)pyridine

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To a solution of 2-benzyloxy-5-((E)-2-nitro-vinyl)-pyridine described in Manufacturing Example 231-1-3 (44.0 g, 172 mmol) and acetic acid (44.0 mL) in dimethyl sulfoxide (200 mL) was added sodium borohydrate (11.0 g, 275 mmol) at room temperature while cooling appropriately under nitrogen atmosphere, which was stirred for 30 minutes. Water was added to this reaction solution at room temperature while cooling appropriately, which was then partitioned into water and ethyl acetate. The organic layer was separated, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and then filtered. The filtrate was concentrated under a reduced pressure. The residue was purified by NH silica gel column chromatography (ethyl acetate:heptane=1:4) to obtain the title compound (18.1 g, 40.7%).

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