Sodium Hydroxide → HCID 12897042, compound

Participants

Reaction Steps

Methyl 5-(4-fluorophenylthio)pyrrole-3-carboxylate (1.5 g.) was combined with 10 ml. of methanol and 10 ml. of 1N sodium hydroxide and refluxed for 2 hours. The methanol was allowed to evaporate, the aqueous residue was diluted with approximately one volume of water and extracted twice with ether. The aqueous phase was cooled in an ice-water bath and acidified to pH 2.0 with conc. hydrochloric acid. The gummy solid which precipitated was extracted into ethyl acetate. The three combined ethyl acetate extracts were washed with saturated brine, dried over anhydrous sodium sulfate, filtered and evaporated to an oil. Trituration with hexane gave crystalline 5-(4-fluorophenylthio)pyrrole-3-carboxylic acid (1.17 g., m.p. 116-118, m/e 237), recovered by filtration.

Provenance & Evidence