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A solution (2.08 mL) of lithium aluminum hydride (2.4 mole) in tetrahydrofuran was added dropwise under ice cooling to a solution of methyl 4-(1,3-oxazol-5-yl)benzoate (1.02 g) in tetrahydrofuran (20 mL), followed by stirring at 0° C. for 30 minutes. Hydrogen fluoride (840 mg) and water (270 mL) were added to the solution, and the mixture was stirred at room temperature for 1 hour. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure. The residue was purified through flash column chromatography (n-hexane:ethyl acetate=3:2), followed by concentration under reduced pressure, to thereby yield the title compound (321 mg).

1. stirringthe mixture was stirred at room temperature for 1 hour
2. filtrationThe reaction mixture was filtered
3. concentrationthe filtrate was concentrated under reduced pressure
4. customThe residue was purified through flash column chromatography (n-hexane:ethyl acetate=3:2)
5. concentrationfollowed by concentration under reduced pressure