Sodium hydride → Tert-butyl 4-[2-(4-methanesulfonyl-phenoxymethyl)pyridin-5-yl]piperidine-1-carboxylate

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反応手順

A solution of 4-(methanesulfonyl)phenol (25 mg, 0.14 mmol) in dry tetrahydrofuran (0.5 mL) was added dropwise over 5 minutes to an ice-cooled suspension of sodium hydride (55% dispersion in mineral oil, 10 mg, 0.22 mmol) in dry tetrahydrofuran (0.5 mL). After stirring for an additional 20 minutes under N2, a solution of tert-butyl 4-[2-(methanesulfonyloxymethyl)pyridine-5-yl]piperidine-1-carboxylate (59 mg, 0.16 mmol) in dry tetrahydrofuran (0.5 mL) was added dropwise over 5 minutes to the mixture. The resulting mixture was stirred at room temperature for 2 hours and then refluxed overnight, to which was added saturated aqueous ammonium chloride solution and 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 silica gel column chromatography (hexane/ethyl acetate=1/2) to give a white solid. The solid was dissolved in ethyl acetate and extracted with 1N hydrochloric acid. The aqueous layer was neutralized by adding 1N sodium hydroxide and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the title compound as a white crystal (7.5 mg, yield 11%).

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