[CH3:1][C:2]1[C:6]([CH3:7])=[N+:5]([O-])[N:4]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[N:3]=1.C(Cl)(=[O:17])C.[OH-].[Na+]>C1(C)C=CC=CC=1.C(N(CC)CC)C>[CH3:1][C:2]1[C:6]([CH2:7][OH:17])=[N:5][N:4]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[N:3]=17.1 g of 4,5-dimethyl-2-phenyl-1,2,3-triazol-1-oxide was dissolved in 25 ml of toluene, and heated to 80° C. 4.8 g of acetyl chloride diluted with 13 ml of toluene and 9.1 ml of triethylamine diluted with 13 ml of toluene were simultaneouly added dropwise thereto, keeping the temperature below 85° C. After stirring for 1 hour at 80° C., 2.5 ml of acetyl chloride diluted with 5 ml of toluene and 4.5 ml of triethylamine diluted with 5 ml of toluene were simultaneously added. After stirring for 1 hour at 80° C., the solution was left overnight at room temperature. 7 ml of 30% aqueous solution of sodium hydroxide was added, then toluene and triethylamine were distilled off under reduced pressure. 5 ml of ethanol and 30% aqueous solution of sodium hydroxide were added, and refluxed with heating for 1 hour. After ethanol was distilled off under reduced pressure, 50 ml of 10% saline solution was added, and left for some time at room temperature. The deposited crystals was dissolved in ethyl acetate, washed with water and a saturated salt solution, then dried over anhydrous sodium sulfate. After the solvent was distilled off, the residue was purified through silica gel column chromatography (hexan/ethyl acetate=1/2), then washed with hexan/diisopropyl ether (=10/1) to obtain 5.7 g of the aimed compound.
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