反应详情

温度

0 °C

(2R*,4S*)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-hydroxypyrimidin-2-yl)}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (150 mg) is dissolved in N,N-dimethylformamide (1 ml), then thereto is added sodium hydride (63%,11 mg) under ice-cooling, and the mixture is stirred at 0° C. for 30 minutes. Methyl iodide (23 μl) is added thereto, and the mixture is stirred for 2 hours under ice-cooling. To the reaction mixture is added 10% aqueous citric acid solution, 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=4:1) to give (2R*,4S*)-4-{[3,5-bis(trifluoromethyl)benzyl]-(5-methoxypyrimidin-2-yl)}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (120 mg). MS (m/z): 614 [M+H]+

1. temperaturecooling
2. stirringthe mixture is stirred for 2 hours under ice-
3. temperaturecooling
4. extractionthe mixture is extracted with ethyl acetate
5. washThe organic layer is washed with a saturated brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. customThe resulting residue is purified by column chromatography (silica gel; hexane:ethyl acetate=4:1)