反应详情

A solution of 5-(2-methoxy-ethoxy)-indole (2.06 g, 11.0 mmol) in acetic acid (7 ml) and 40% aqueous dimethylamine (2.1 ml) is cooled to 0° C., and 36% aqueous formaldehyde (1.38 ml) (pre-cooled to 0° C.) is added drop wise. The mixture is stirred at room temperature overnight, 2 M hydrochloric acid is added, and the mixture is washed with dichloromethane. The aqueous layer is made alkaline with 10% NaOH, and is extracted with dichloromethane. The combined organic layer is washed with water, is dried and concentrated. The residue is purified by column chromatography (dichloromethane-methanol, 4:1→dichloromethane-methanol-water-aqueous ammonia, 10:20:1:1) to afford [5-(2-methoxy-ethoxy)-1H-indol-ylmethyl]-dimethyl-amine (2.42 g, 90%). M.p. 163-164° C. (from toluene-N,N-dimethylformamide).

1. washthe mixture is washed with dichloromethane
2. extractionis extracted with dichloromethane
3. washThe combined organic layer is washed with water
4. customis dried
5. concentrationconcentrated
6. customThe residue is purified by column chromatography (dichloromethane-methanol, 4:1→dichloromethane-methanol-water-aqueous ammonia, 10:20:1:1)