Ethyl Acetate → (2R,4S)-4-{[3,5-bis(trifluoromethyl)benzyl]-[5-(morpholin-4-yl)pyrimidin-2-yl]}amino-2-ethyl-6-methyl-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(morpholin-4-yl)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethanesulfonyloxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (250 mg) is dissolved in 1,4-dioxane (3 ml), and thereto are added a catalytic amount of tetrakis(triphenylphosphine)palladium, a catalytic amount of silver carbonate and a catalytic amount of copper (I) chloride under nitrogen flow. After adding dropwise trimethylaluminum-hexane solution (1M, 480 μl), the mixture is stirred at 60° C. for 30 minutes. After cooling to room temperature, a saturated aqueous sodium hydrogen carbonate solution and ethyl acetate are added to the reaction solution. 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 (NH-silica gel; hexane: ethyl acetate=9:1→4:1) to give (2R,4S)-4-{[3,5-bis(trifluoromethyl)benzyl]-[5-(morpholin-4-yl)pyrimidin-2-yl]}amino-2-ethyl-6-methyl-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (153 mg). MS (m/z): 653 [M+H]+

Provenance & Evidence