ethyl 7-chloro-5-fluoro-1H-indole-2-carboxylate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 250 mg of ethyl 7-chloro-5-fluoro-1H-indole-2-carboxylate in 2 mL of methanol was added 5 mL of 1M aqueous sodium hydroxide solution, followed by stirring at room temperature for 3 hours. The reaction liquid was adjusted to an acidic condition by adding a 1M aqueous hydrochloric acid solution, followed by extraction with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate and then concentrated under reduced pressure to obtain 210 mg of 7-chloro-5-fluoro-1H-indole-2-carboxylic acid as a white solid. The reaction liquid followed by extraction with ethyl acetate The organic layer was washed with saturated brine dried over anhydrous sodium sulfate concentrated under reduced pressure