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In a nitrogen atmosphere, 10% palladium-carbon (3.2 g) was added to an EtOH (50 mL)-THF (5 mL) mixed solution of methyl 2-phenyl-6-benzyloxypyridine-4-carboxylate (5.3 g), and in a hydrogen atmosphere, this was stirred at room temperature for 9 hours. The reaction liquid was filtered through Celite, concentrated under reduced pressure, and a mixed solution of hexane/ethyl acetate=2/1 was added thereto. The precipitate was taken out through filtration, washed with that solution, and dried to obtain the title compound as a white powder. The filtrate was concentrated, and the residue was purified through silica gel column chromatography (from hexane/ethyl acetate to chloroform/methanol), and combined with the previous powder to obtain the title compound as a white powder.

1. customThe reaction liquid
2. filtrationwas filtered through Celite
3. concentrationconcentrated under reduced pressure
4. additiona mixed solution of hexane/ethyl acetate=2/1 was added
5. filtrationThe precipitate was taken out through filtration
6. washwashed with that solution
7. customdried