A mixture of 1-[1-(4-fluorophenethyl)piperidin-4-yl]-6-bromoacetamidomethylindole (170 mg) obtained in Example 374, a 2 M solution (2.2 ml) of dimethylamine in tetrahydrofuran and dimethylformamide (5 ml) was stirred at room temperature for 2 hr. Then water and ethyl acetate were added to the reaction solution. The organic layer was separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by Chromatorex NH silica gel column chromatography (hexane/ethyl acetate system) to give the title compound (35 mg) as an oil.
