Dimethyl Sulfoxide → 5-Fluoro-2-(3-fluoro-4-(2-nitro-ethyl)-phenoxymethyl)pyridine

Participants

Reaction Steps

To a dimethyl sulfoxide (20.0 mL)-tetrahydrofuran (5.00 mL) solution of 5-fluoro-2-(3-fluoro-4-((E)-2-nitro-vinyl)-phenoxymethyl)-pyridine (1.00 g, 3.42 mmol) described in Manufacturing Example 96-1-2 and acetic acid (1.00 mL) was added sodium borohydride (207 mg, 5.47 mmol) at room temperature while cooling appropriately under nitrogen atmosphere, which was stirred for 10 minutes at room temperature. Water was then added dropwise at room temperature while cooling appropriately. The reaction mixture was extracted with ethyl acetate, and the organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure, and the residue was crystallized with an ethyl acetate: heptane system and filtered to obtain the title compound (346 mg, 34.4%).

Provenance & Evidence