Sodium Bicarbonate → 1-(2-(4-(((5-ethylpyridin-2-yl)methyl)amino)piperidin-1-yl)ethyl)-7-methoxy-1,5-naphthyridin-2(1H)-one

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Reaction Steps

To a suspension of 0.20 g of 1-(2-(4-aminopiperidin-1-yl)ethyl)-7-methoxy-1,5-naphthyridin-2(1H)-one hydrochloride in 2 mL of methanol, 0.28 g of a 28% sodium methoxide/methanol solution, 66 mg of 5-ethylpyridine-2-carbaldehyde and 28 μL of acetic acid were added. Then, 61 mg of sodium cyanoborohydride was added thereto and the mixture was stirred at room temperature for 3 hours. Thereto was further added 31 mg of sodium cyanoborohydride, and the mixture was stirred at room temperature for 1 hour 30 minutes. To the reaction mixture, chloroform and a saturated aqueous sodium hydrogen carbonate solution were added. The organic layer was separated, washed with water and a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The resultant residue was purified by basic silica gel column chromatography using gradient elution with chloroform:methanol=93:7 to 9:1 to obtain 0.15 g of 1-(2-(4-(((5-ethylpyridin-2-yl)methyl)amino)piperidin-1-yl)ethyl)-7-methoxy-1,5-naphthyridin-2(1H)-one as a light yellow oily substance.

Provenance & Evidence