Nitromethane → 5-(2-Nitro-ethyl)-2-phenoxy-pyridine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 6-phenoxy-pyridine-3-carbaldehyde (1.12 g, 5.62 mmol) described in Manufacturing Example 40-1-2 in acetic acid (10 mL) were added nitromethane (1.52 mL, 28.1 mmol) and ammonium acetate (866 mg, 11.2 mmol) under nitrogen atmosphere, which was stirred for 3 hours at 100° C. After being cooled to room temperature, the reaction solution was partitioned into water and ethyl acetate. The organic layer was separated, washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under a reduced pressure. The resulting residue was dissolved in dimethyl sulfoxide (17 mL) and acetic acid (3 mL). Sodium borohydride (336 mg, 8.43 mmol) was added to this solution at room temperature while cooling appropriately, and stirred for 30 minutes at room temperature. The reaction solution was partitioned by addition of sodium hydrogencarbonate, water and ethyl acetate. The organic layer was separated, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under a reduced pressure. The residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=3:1) to obtain the title compound (753 mg, 55%).

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