Water → 6-(Trifluoromethyl)benzo[b]thiophene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 400 mg of methyl 6-(trifluoromethyl)benzo[b]thiophene-2-carboxylate, 105 mg of lithium hydroxide monohydrate, 3 ml of water and 9 ml of methanol was stirred at 75° C. for 2 hours. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. To the residue was added water, and then washed with tert-butyl methyl ether 3 times. To the aqueous layer was added concentrated hydrochloric acid, and then extracted with chloroform 3 times. The combined organic layer was washed with saturated aqueous sodium chloride solution, dried over magnesium sulfate, and then concentrated under reduced pressure to obtain 355 mg of 6-(trifluoromethyl)benzo[b]thiophene-2-carboxylic acid (the present compound 2).

Provenance & Evidence