Lithium borohydride → (8-(Benzyloxymethyl)-1,4-dioxaspiro[4.5]decan-8-yl)methanol

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Reaction Steps

To a solution of ethyl 8-(benzyloxymethyl)-1,4-dioxaspiro[4.5]decane-8-carboxylate (Reference Example 84) (279 mg, 0.834 mmol) in tetrahydrofuran (4.2 mL), lithium borohydride (91.0 mg, 4.17 mmol) was added with stirring under ice-cooling, and the obtained solution was stirred at 70° C. for 4 hours. The reaction was quenched by adding saturated aqueous ammonium chloride solution to the reaction solution, and the resulting solution was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate) to obtain the captioned compound (183 mg, 0.625 mmol, 75%) as a colorless oily compound.

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