Lithium hydroxide, monohydrate → 5-Hydroxymethyl-7-nitro-1H-indole-2-carboxylic acid

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Reaction Steps

5-Acetoxymethyl-7-nitro-1H-indole-2-carboxylic acid methyl ester (3.5 g, 12.0 mmol) prepared in Step B was dissolved in a solvent mixture of tetrahydrofuran, methanol and water (1:1:1, 100 mL). Lithium hydroxide hydrate (1.5 g, 35.9 mmol) was added thereto, and the mixture was stirred for 3 h at room temperature. After completion of the reaction, methanol and tetrahydrofuran were removed by distillation under reduced pressure. 1N hydrochloric acid was added to the residue. The reaction mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, and distilled under reduced pressure to remove the solvent. The residue was purified by column chromatography to give the title compound (2.3 g, Yield 81%).

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