8-(3-Fluorophenyl)-1,4-dioxaspiro[4.5]dec-7-ene → 8-(3-Fluorophenyl)-1,4-dioxaspiro[4.5]decane

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Reaction Steps

The compound (17) was dissolved in a mixed solvent of toluene (150 ml) and Solmix (150 ml) and 3.48 g of Pd/C was added thereto. The mixture was stirred at room temperature under a hydrogen atmosphere until hydrogen absorption had ceased. After the reaction had been completed, Pd/C was removed and then the solvent was distilled off. The residue was purified with a fractional operation by means of column chromatography using a mixed solvent of toluene and ethyl acetate (toluene:ethyl acetate=9:1 by volume) as an eluent and silica gel as a stationary phase powder and dried, giving 61.9 g of 8-(3-fluorophenyl)-1,4-dioxaspiro[4,5]decane (18). The yield based on the compound (17) was 88.1%.

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