To a solution of 4-chloro-3-methoxybenzoic acid (65 mg) in dichloromethane (4 mL) was added 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide (67 mg), 1-hydroxybenzotriazole hydrate (58 mg), and diisopropylethylamine (0.25 mL). The mixture was stirred at room temperature for five minutes and then the hydrochloride salt of the compound prepared in Example 9 (100 mg) was added. The reaction mixture was stirred at room temperature for 16 hours. The organic phase was diluted with ethyl acetate, washed with a saturated aqueous sodium bicarbonate solution, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by column chromatography on silica gel (ethyl acetate:hexane=1:1, then ethyl acetate) to obtain the title compound (70 mg) having the following physical data.
