反应详情

To a solution of ethyl 1-(methoxymethyl)-7-{[(2-methoxyphenyl)sulfonyl]amino}-1H-indole-2-carboxylate (11.0 g) and potassium carbonate (5.9 g) in N,N-dimethylformamide (80 mL) was added methyl iodide (2.7 mL) under ice-cooling, and the mixture was stirred from under ice-cooling to room temperature for 18 hr. The reaction solution was diluted with ethyl acetate, washed with aqueous citric acid solution, water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=3:2-4:1), and the obtained crystals were washed with ethyl acetate-hexane to give the title compound (10.9 g, yield: 89%) as colorless needle crystals. melting point: 124-125° C.

1. temperaturecooling
2. washwashed with aqueous citric acid solution, water and saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. washthe obtained crystals were washed with ethyl acetate-hexane