Tetrahydrofuran → 7-{[(5-Chloro-2-thienyl)sulfonyl]amino}-1H-indole-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 7-{[(5-chloro-2-thienyl)sulfonyl]amino}-1H-indole-2-carboxylate (1.03 g), 8N aqueous sodium hydroxide solution (1.3 mL), tetrahydrofuran (5 mL) and ethanol (15 mL) was stirred at 60° C. for 2 hr. The reaction mixture was concentrated, and water was added to the residue. The mixture was acidified with 10% aqueous citric acid solution, and the resulting crystals were filtrated, washed with water, and dried to give the title compound (0.92 g, yield 90%) as colorless crystals. melting point>277° C. (decomposition).

Provenance & Evidence