[Br:1][C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([CH:11]=[O:12])[CH:9]=2)[N:4]([CH2:13][CH:14]([CH3:16])[CH3:15])[C:3]=1[C:17]([O:19][CH2:20][CH3:21])=[O:18].O.O.P([O-])(O)(O)=[O:25].[Na+].Cl([O-])=O.[Na+].C(OCC)(=O)C>C(#N)C.O.OO>[Br:1][C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:11]([OH:25])=[O:12])[CH:9]=2)[N:4]([CH2:13][CH:14]([CH3:15])[CH3:16])[C:3]=1[C:17]([O:19][CH2:20][CH3:21])=[O:18]
In 7 ml of acetonitrile is dissolved 0.65 g of ethyl 3-bromo-5-formyl-1-isobutyl-1H-indole-2-carboxylate. To the solution are successively added at ambient temperature 1.56 g of sodium dihydrogen-phosphate dihydrate dissolved in 22 ml of water and 0.64 ml of 30% aqueous hydrogen peroxide. Then, 0.68 g of sodium chlorite dissolved in 20 ml of water is dropwise added thereto at 5-10° C. The mixture thus obtained is stirred at 60° C. for one hour. Ethyl acetate and water are added to the reaction mixture, and the organic layer is separated. The organic layer thus obtained is washed with water and saturated aqueous solution of sodium chloride successively and dried over anhydrous magnesium sulfate, and then the solvent is distilled off under reduced pressure. Thus, 0.37 g of 3-bromo-2-(ethoxycarbonyl)-1-isobutyl-1H-indole-5-carboxylic acid is obtained as a yellow solid product.
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