[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].[CH2:25]([OH:27])[CH3:26].[O-]CC.[Na+]>O>[CH2:25]([O:27][C:17]1[C:16]([CH3:22])=[N:15][N:14]([CH3:23])[C:13](=[O:24])[C:12]=1[C:4]1[C:3]([CH2:1][CH3:2])=[CH:8][C:7]([CH3:9])=[CH:6][C:5]=1[CH2:10][CH3:11])[CH3:26]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-dihydropyridazin-3-one ((2-34)-(1)-39) (52.2 mg), ethanol (674.3 mg), and sodium ethoxide (121.8 mg) were added under a nitrogen atmosphere at room temperature and stirred for 4 hours at 70° C. To the reaction mixture was added water (4 ml) at room temperature, and extracted with tert-butyl methyl ether. The organic layer was concentrated under reduced pressure to give 83.6 mg of 5-ethoxy-4-(2,6-diethyl-4-methylphenyl)-2,6-dimethyl-2,3-dihydro-3-pyridazinone ((1-6)-(1)-39).
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