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Under an argon atmosphere and cooling with ice, phosphorus tribromide (2.36 mL, 24.7 mmol) was added dropwise to a solution of (4-methoxy-3-nitrophenyl)methanol (12.2 g, 66.6 mmol) in anhydrous ether (350 mL) under stirring, and the mixture was stirred for 3.5 hours. Ice water (300 mL) was added to the reaction mixture. The organic layer was separated, washed with water and brine, dried over anhydrous sodium sulfate, and then concentrated. The residue was purified by means of silica gel column chromatography (eluent: n-hexane:ethyl acetate=2:1→1:1 v/v) to afford 8.36 g (51%) of the title compound as pale yellow crystals.

1. stirringthe mixture was stirred for 3.5 hours
2. customThe organic layer was separated
3. washwashed with water and brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified by means of silica gel column chromatography (eluent: n-hexane:ethyl acetate=2:1→1:1 v/v)