Ammonium Chloride → (2R,4S)-4-{[3,5-bis(trifluoromethyl)benzyl]-[5-(5-hydroxymethylpyridin-3-yl)pyrimidin-2-yl]}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester

Participants

Reaction Steps

(2R,4S)-4-{[3,5-bis(trifluoromethyl)benzyl]-[5-(5-formylpyridin-3-yl)pyrimidin-2-yl]}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (118 mg) is dissolved in tetrahydrofuran (1.5 ml), then thereto is added 1M-diisobutylaluminum hydride-tetrahydrofuran solution (0.33 ml) dropwise under ice-cooling and the mixture is stirred for 1 hours under nitrogen flow under ice-cooling. A aqueous saturated ammonium chloride solution is added to the reaction mixture and the mixture is extracted with ethyl acetate. The organic layer is washed with a saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting residue is purified by column chromatography (silica gel; hexane: ethyl acetate=1:1) to give (2R,4S)-4-{[3,5-bis(trifluoromethyl)benzyl]-[5-(5-hydroxymethylpyridin-3-yl)pyrimidin-2-yl]}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (84 mg). MS (m/z): 691 [M+H]+

Provenance & Evidence