[CH3:1][NH:2][N:3]=[CH:4][C:5](=[O:7])[CH3:6].O=[C:9]([C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([F:21])([F:20])[F:19])[CH:13]=1)[CH:10]=[O:11].C(Cl)(Cl)Cl.CO>C(O)(=O)C>[OH:11][C:10]1[C:4]([C:5](=[O:7])[CH3:6])=[N:3][N:2]([CH3:1])[C:9]=1[C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([F:21])([F:20])[F:19])[CH:13]=12-Oxopropanal methylhydrazone (7.49 mmol, 750 mg) and (oxo)[3-trifluoromethylphenyl]acetaldehyde (7.0 mmol, 1.42 g) synthesized in Reference Synthetic Example 8 were dissolved in acetic acid (20 mL) and stirred at 100° C. for 4 hours. Then, the solvent was evaporated, and the residue was dried by means of a vacuum pump and purified by silica gel column chromatography (n-hexane/ethyl acetate=2/1) and then by silica gel thin layer chromatography (chloroform/methanol=30/1) to give the desired product as a reddish yellow liquid (221 mg, yield 11%).
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