Chlorotrimethylsilane → 1-(3,4-dihydro-2,6-naphthyridin-2(1H)-yl)-2-((1-(4-methoxy-2,6-dimethylphenylsulfonyl)piperidin-2-yl)methoxy)ethanone hydrochloride

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Reaction Steps

N,N′-Carbonyldiimidazole (68 mg, 0.424 mmol) was added to a solution of 2-((1-(4-methoxy-2,6-dimethylphenylsulfonyl)piperidin-2-yl)methoxy)acetic acid (150 mg, 0.404 mmol) in dichloromethane (4 ml), and the mixture was stirred for 1 h at room temperature. A solution of 1,2,3,4-tetrahydro-2,6-naphthyridine (54 mg, 0.404 mmol) in dichloromethane (1 ml) was then added, and the reaction mixture was stirred for 15 h at room temperature. Saturated sodium hydrogen carbonate solution (5 ml) was then added to the reaction mixture, and then the aqueous phase was extracted with dichloromethane (2×10 ml). The combined organic phases were extracted with saturated sodium chloride solution (10 ml), dried over sodium sulfate and concentrated in vacuo. The crude product was purified by flash chromatography using ethyl acetate/methanol (20:1). 1-(3,4-dihydro-2,6-naphthyridin-2(1H)-yl)-2-((1-(4-methoxy-2,6-dimethylphenylsulfonyl)piperidin-2-yl)methoxy)ethanone (197 mg, 0.404 mmol) was dissolved in methyl ethyl ketone (5 ml), and trimethylchlorosilane (61 μl, 0.516 mmol) was added slowly. Diethyl ether (10 ml) was then added, and the mixture was stirred for 1 h at 0° C. The resulting precipitate was filtered off, dried with the exclusion of air and washed with diethyl ether.

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