[CH2:1](Br)[CH:2]=[CH2:3].[OH:5][C:6]1[C:7]2[C:11]([CH:12]=[CH:13][CH:14]=1)=[N:10][N:9]([CH3:15])[C:8]=2[S:16]([NH2:19])(=[O:18])=[O:17].C(=O)([O-])O.[Na+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>CN(C=O)C>[CH2:1]([O:5][C:6]1[C:7]2[C:11]([CH:12]=[CH:13][CH:14]=1)=[N:10][N:9]([CH3:15])[C:8]=2[S:16]([NH2:19])(=[O:18])=[O:17])[CH:2]=[CH2:3]1.3 g of allyl bromide was added to a mixture comprising 5 g (22 mmol) of 4-hydroxy-2-methyl-2H-indazole-3-sulfonamide and 50 ml of a DMF solution of 1.9 g (22 mmol) of sodium hydrogencarbonate, and the mixture was stirred at room temperature for 12 hours. The mixture was poured into ice water, acidified with citric acid and extracted with ethyl acetate. The organic layer was washed, then concentrated and purified by column chromatography (hexane/ethyl acetate=2/1) to obtain 1.9 g (yield: 32.5%) of the desired product. Melting point: 143°-144° C.
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