The crude product of the title compound was synthesized by conducting the reaction similar to that mentioned in Example 1 (1f) using (4-ethyl-5-{5-[4-(2-fluorophenoxy)phenyl]-1,2,4-oxadiazol-3-yl}-2-thienyl)methanol (0.17 g, 0.43 mmol) that was obtained in Example 10 (10f), carbon tetrabromide (0.17 g, 0.51 mmol), triphenylphosphine (0.13 g, 0.51 mmol), methyl 3-azetidinecarboxylate hydrochloride (0.10 g, 0.65 mmol), N,N-diisopropylethylamine (0.23 mL, 1.3 mmol). Subsequently, the crude product of the title compound thus obtained was purified by chromatography using a mixed solvent of ethyl acetate and hexane (5:5) to afford the title compound (0.19 g) in a yield of 90% as a white crystalline solid.
