ethyl 3-[1-(4-benzyloxybenzyl)-3-ethoxy-1H-pyrazol-4-yl]propionate → ethyl 3-[3-ethoxy-1-(4-hydroxybenzyl)-1H-pyrazol-4-yl]propionate

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A mixture of ethyl 3-[1-(4-benzyloxybenzyl)-3-ethoxy-1H-pyrazol-4-yl]propionate (5.32 g), 5% palladium-carbon (3.45 g), and tetrahydrofuran (100 ml) was stirred for 3 hours at room temperature under a hydrogen atmosphere. After the palladium-carbon was removed by filtration, the filtrate was concentrated. The residue was subjected to silica gel column chromatography, and ethyl 3-[3-ethoxy-1-(4-hydroxybenzyl)-1H-pyrazol-4-yl]propionate (3.56 g, yield: 86%) was obtained as a colorless oily substance from the fraction eluted with ethyl acetate-hexane (1:1, volume ratio).

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