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To a mixture of 2-[4-(6-chloro-3-formyl-1H-indol-5-yl)phenoxy]acetamide (100 mg, 0.30 mmol) in acetonitrile (5 mL) and tert-butanol (5 mL) was added 2-methyl-2-butene (4 mL). The reaction mixture was cooled to 0° C. and treated with a solution of sodium chlorite (540 mg, 6.00 mmol) and sodium phosphate monobasic hydrate (850 mg, 6.00 mmol) in water (5 mL) dropwise via additional funnel. The ice bath was removed and the reaction was stirred at room temperature for 48 h. The solvent was removed in vacuo to give a residue, which was purified by prep-HPLC (Prep-HPLC: Column: Kromasil Eternity-5-C18 150*30 mm*5 μm Mobile phase: from 24% MeCN in water (0.225% FA) to 34% MeCN in water (0.225% FA); Wavelength: 220 nm Flow rate: 30 mL/min) to give 5-[4-(2-amino-2-oxoethoxy)phenyl]-6-chloro-1H-indole-3-carboxylic acid (22 mg, 20% yield) as a white solid. MS (ES+) 344.8 (M+H)+. 1H NMR (400 MHz, CD3OD) δ 8.01-7.99 (m, 2H), 7.57 (s, 1H), 7.43-7.39 (m, 2H), 7.07-7.05 (m, 2H), 4.56 (s, 2H).

1. customThe ice bath was removed
2. customThe solvent was removed in vacuo
3. customto give a residue, which
4. customwas purified by prep-HPLC (Prep-HPLC: Column: Kromasil Eternity-5-C18 150*30 mm*5 μm Mobile phase: from 24% MeCN in water (0.225% FA) to 34% MeCN in water (0.225% FA); Wavelength: 220 nm Flow rate: 30 mL/min)