1-Bromopentane → 3-Methyl-1-pentyloxynaphthalene

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The crude product of 3-methylnaphthalen-1-ol, dimethylformamide (DMF, 20 ml), potassium carbonate (3 g, 21.7 mmol) and pentyl bromide (4.0 ml, 32.3 mmol) were mixed in a reaction vessel replaced with argon, and this solution was stirred at 90° C. for 3 hours. DMF was evaporated under reduced pressure, and water (20 ml) was added. The aqueous layer was extracted with ethyl acetate (20 ml) 3 times. The organic layer was washed with saturated brine (20 m1l) and dried over anhydrous magnesium sulfate. The drying agent was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by column chromatography (hexane/ethyl acetate=100/0-50/1) to give 3-methyl-1-pentyloxynaphthalene (827 mg, 12% in 3 steps) as a colorless oil.

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