A solution (5 ml) of spiro[1-benzofuran-3,3′-pyrrolidine] (50 mg) obtained in Example 50-(5) and 3-chloro-6-(3-methyl-1,2,4-oxadiazol-5-yl)pyridazine (56 mg) obtained in Example 43-(2) and potassium carbonate (79 mg) in N,N-dimethylformamide was stirred at 95° C. for 3 days. To the reaction solution was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over sodium sulfate. The desiccant was filtered off, and the filtrate was concentrated. The residue was recrystallized from ethyl acetate to give the object product (45.1 mg, 47%).
