[Br:1][C:2]1[C:3](=[O:11])[N:4]([CH2:9][CH3:10])[N:5]=[CH:6][C:7]=1Br.[CH3:12][O:13][CH2:14][O:15][C:16]1[CH:23]=[CH:22][C:19]([CH2:20][OH:21])=[CH:18][CH:17]=1.[OH-].[K+].O>CN(C)C=O>[Br:1][C:2]1[C:3](=[O:11])[N:4]([CH2:9][CH3:10])[N:5]=[CH:6][C:7]=1[O:21][CH2:20][C:19]1[CH:18]=[CH:17][C:16]([O:15][CH2:14][O:13][CH3:12])=[CH:23][CH:22]=1In 30 ml of N,N-dimethylformamide were dissolved 1.2 g of 4,5-dibromo-2-ethyl-3(2H)-pyridazinone and 0.88 g of 4-methoxymethoxybenzyl alcohol, and 0.34 g of powdery potassium hydroxide was added thereto. The reaction mixture was stirred overnight at room temperature, poured into water and extracted with benzene. The benzene layer was washed with water, dried over anhydrous sodium sulfate and freed of the benzene by distillation under reduced pressure. The resulting oil was purified by means of TLC [eluting with benzene/ethyl acetate (12/1)] and recrystallization (from benzene/n-hexane) to obtain 450 mg of the aimed compound, m.p. 104°~106.0° C.
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