To a mixture of (4-(5-methyl-furan-2-ylmethyl)-phenyl)-acetohydroximoyl chloride (38 mg, 0.14 mmol) described in Manufacturing Example 46-1-6 and tetrahydrofuran (1 mL) were added 5-ethynyl-pyridin-2-ylamine (15 mg, 0.13 mmol) described in Manufacturing Example 28-1-3 and triethylamine (35 μL, 0.25 mmol), which was stirred for 3.5 hours at 50° C. The reaction mixture was allowed to room temperature, and water was added to the system at the same temperature, which was extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride and was concentrated under a reduced pressure. The residue thus obtained was purified by reverse-phase high performance liquid chromatography (using an acetonitrile-water mobile phase containing 0.1% trifluoroacetic acid), after which triethylamine was added to a mixture of the resulting target product and the mobile phase, thereby rendering the mobile phase basic, and the eluate was concentrated under a reduced pressure. The residue thus obtained was washed with water to obtain the title compound (5.1 mg, 12%).
