[OH:1][C:2]1[C:11]([N+:12]([O-:14])=[O:13])=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([CH3:15])[CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:22](Br)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.O>CN(C)C=O>[CH2:22]([O:1][C:2]1[C:11]([N+:12]([O-:14])=[O:13])=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([CH3:15])[CH:3]=1)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1Methyl 4-hydroxy-2-methyl-5-nitrobenzoate (12.9 g) was dissolved in dimethylformamide (200 ml), and thereto were added potassium carbonate (20.1 g) and benzyl bromide (13.7 g), and the mixture was stirred at 70° C. for 4 hours. Water was added to the reaction mixture, and extracted with ethyl acetate. The obtained organic layer was washed with 1N aqueous hydrochloric acid solution, and saturated aqueous sodium chloride solution, dried over sodium sulfate, and the organic layer was concentrated under reduced pressure. The obtained solid was washed with hexane/ethyl acetate=10/1 to give the title compound (13 g).
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