反应详情

To a solution of 1H-indole-4-carbaldehyde (413 mg, 2.85 mmol) in anhydrous DMF (6.5 mL) was added sodium hydride (171 mg of 60% dispersion in oil, 4.27 mmol). The mixture was stirred for 40 min at room temperature. Methyl iodide (0.36 mL, 5.78 mmol) was then added and the reaction mixture was stirred for 12 h at room temperature. Water was added (25 mL) and the mixture was extracted with ethyl acetate (3×25 mL). Combined organic layers were washed with water (20 mL) and brine (20 mL), dried over Na2SO4, filtered and concentrated to a yellow oil. Purification by column chromatography (silica gel, CH2Cl2) gave 1-methyl-1H-indole-4-carbaldehyde (452 mg g, 99%) as a yellow oil: 1H NMR (400 MHz, DMSO-d6) δ 10.20 (s, 1H), 7.84 (d, J=8.0 Hz, 1H), 7.68 (d, J=7.2 Hz, 1H), 7.58 (d, J=2.8 Hz, 1H), 7.38-7.34 (m, 1H), 7.08 (d, J=3.2 Hz, 1H), 3.87 (s, 3H).

1. stirringthe reaction mixture was stirred for 12 h at room temperature
2. extractionthe mixture was extracted with ethyl acetate (3×25 mL)
3. washCombined organic layers were washed with water (20 mL) and brine (20 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated to a yellow oil
7. customPurification by column chromatography (silica gel, CH2Cl2)