[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12]1[C:13](=[O:24])[N:14]([CH3:23])[N:15]=[C:16]([CH3:22])[C:17]=1S(C)(=O)=O)[CH3:2].[OH-:25].[Na+].Cl>CS(C)=O>[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12]1[C:13](=[O:24])[N:14]([CH3:23])[N:15]=[C:16]([CH3:22])[C:17]=1[OH:25])[CH3:2]To a test tube (outside diameter: 21 mm φ×overall length: 160 mm), 4-(2,6-diethyl-4-methylphenyl)-2,6-dimethyl-5-methylsulfonyl-2,3-dihydropyridazine-3-one ((2-34)-(1)-39) (62.8 mg), dimethylsulfoxide (0.5 ml), and 3.8% by weight of aqueous sodium hydroxide solution (0.5 ml) were added under a nitrogen atmosphere at room temperature, and stirred at 70° C. for 4 hours. Then, to the reaction mixture was added 3.5% by weight of hydrochloric acid (4 ml) at room temperature, and extracted with tert-butyl methyl ether. The organic layer was concentrated under reduced pressure to give 37.5 mg of 4-(2,6-diethyl-4-methylphenyl)-5-hydroxy-2,6-dimethyl-2,3-dihydro-3-pyridazinone ((1-4)-(1)-39).
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