反应详情

温度

0 °C

To a suspension of LiAlH4 (7.8 g, 0.21 mol) in THF (300 mL) was added dropwise a mixture of 4-nitro-1H-indole-2-carboxylic acid ethyl ester and 6-nitro-1H-indole-2-carboxylic acid ethyl ester (B-4-b) (6 g, 25.7 mmol) in THF (50 mL) at 0° C. under N2. The mixture was heated at reflux overnight and then cooled to 0° C. H2O (7.8 mL) and 10% NaOH (7.8 mL) were added to the mixture at 0° C. The insoluble solid was removed via filtration. The filtrate was dried over Na2SO4, filtered and concentrated under reduced pressure. The crude residue was purified by column chromatography to afford 2-methyl-1H-indol-6-ylamine (B-4) (0.3 g, 8%). 1H NMR (CDCl3) δ 7.57 (br s, 1H), 7.27 (d, J=8.8 Hz, 1H), 6.62 (s, 1H), 6.51-6.53 (m, 1H), 6.07 (s, 3H), 3.59-3.25 (br s, 2H), 2.37 (s, 3H); ESI-MS 147.2 m/z (MH+).

1. additionwas added dropwise
2. temperatureThe mixture was heated
3. temperatureat reflux overnight
4. customThe insoluble solid was removed via filtration
5. dry with materialThe filtrate was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe crude residue was purified by column chromatography