To a solution of quinazoline-6-carboxylic acid obtained in Preparation Example H-3 (9 mg, 0.052 mmol) in N,N-dimethylformamide (3 mL) were added 3-phenoxybenzylamine described in Preparation Example 4 (11 mg, 0.052 mmol), benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (28 mg, 0.062 mmol) and triethylamine (17 μl, 0.125 mmol), and the solution was stirred for 2 days at room temperature. Water was added to the reaction mixture, which was extracted with ethyl acetate, and concentrated. The residue was purified by NH silica gel column chromatography (hexane-ethyl acetate), and the title compound (11 mg, 0.031 mmol, 50%) was obtained.
