Bromoacetic acid (0.50 g, 3.6 mmol) was dissolved in anhydrous tetrahydrofuran (20 ml), and the solution was stirred at −15° C. under a nitrogen atmosphere. N-Methylmorpholine (0.40 ml, 3.6 mmol) and isobutyl chlorocarbonate (0.45 ml, 3.5 mmol) were added to the solution. Then a solution of a free base of 2-(1-adamantyl)-N-pentylethylamine hydrochloride (Intermediate No. 1-1, 1.0 g, 3.5 mmol) in anhydrous tetrahydrofuran (20 ml) was added dropwise to the mixture. The whole was stirred at 0° C. for 1.5 hours, then a saturated aqueous sodium hydrogencarbonate solution (70 ml) and ethyl acetate (70 ml) were added to the reaction mixture to distribute it. The ethyl acetate layer was washed with water (70 ml) and a saturated aqueous sodium chloride solution (70 ml) successively, dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give 2-bromoacetic acid N-[2-(1-adamantyl)ethyl]-N-pentylamide (1.3 g, quantitatively) as an oily matter.
