Benzyl Bromide → 1-Benzyl-4-bromo-6-fluoro-1H-indole-2-carboxylic acid methyl ester

関与物質

反応条件

反応手順

To a solution of 4-bromo-6-fluoro-1H-indole-2-carboxylic acid methyl ester (178 mg, 0.65 mmol) in 5 ml anhydrous dimethylformanide was added sodium hydride (52 mg of a 60% suspension in mineral oil, 1.3 mmol) portionwise at 0° C. The solution was stirred with a magnetic stirrer at 0° C. for 20 minutes. Benzyl bromide (0.17 ml, 1.43 mmol) was added in one portion and the reaction mixture was stirred at 0° C. for 30 minutes. The solution was allowed to warm to room temperature and the reaction mixture was partitioned between water and ethyl acetate. The aqueous layer was extracted with ethyl acetate and the combined organic fractions were washed with water and brine. After drying over MgSO4, the organic fraction was concentrated in vacuo and resulting brown residue was purified by Preparative TLC (10% Ethyl acetate/Hexane) to give 80 mg 1-Benzyl-4-bromo-6-fluoro-1H-indole-2-carboxylic acid methyl ester as a yellow solid (34%). 1H NMR (CDCl3, 300 MHz) δ: 3.89 (s, 3H), 5.78 (s, 2H), 7.17 (m, 8H).

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