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Under argon gas, potassium carbonate (2.52 g) and benzyl bromide (1.2 mL) were added to dimethyl formamide (20 mL) solution containing 2-(2-methylindol-3-yl)acetic acid (1.73 g), which was stirred at room temperature for 2 hours. The reaction mixture was radiationally cooled and water was added, and then the mixture was extracted by ethyl acetate. The extract was sequentially washed with water and saturated brine and dried by sulfuric anhydride sodium, and concentrated. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to give a title compound (2.63 g) having the following physical properties was obtained.

1. temperatureThe reaction mixture was radiationally cooled
2. extractionthe mixture was extracted by ethyl acetate
3. washThe extract was sequentially washed with water and saturated brine
4. dry with materialdried by sulfuric anhydride sodium
5. concentrationconcentrated
6. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1)