To a solution of 5-(aminomethyl)-N-cyclopropyl-1-{4-[(ethylamino)carbonyl]phenyl}-1H-1,2,3-triazole-4-carboxamide (164 mg, 0.5 mmol) obtained in Example 1197 in dichloroethane (10 ml) were successively added 1-trityl-1H-imidazole-2-carbaldehyde (169 mg, 0.5 mmol), acetic acid (30 mg, 0.5 mmol) and sodium triacetoxyborohydride (138 mg, 0.65 mmol) at 0° C., and the mixture was stirred at room temperature for 48 hr. The reaction mixture was neutralized with saturated aqueous sodium hydrogen carbonate solution (5 ml) and, after partitioning, the organic layer was dried over magnesium sulfate and concentrated. The residue was purified by silica gel column (hexane/ethyl acetate=1/1 to ethyl acetate/methanol=4/1) to give the title compound as a colorless powder (130 mg, 40%).
