Citric Acid → 5-Chloro-3-(trifluoromethyl)-1-benzothiophene-2-carboxylic acid

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Reaction Steps

A mixture of compound 18e (574 mg, 1.95 mmol) and LiOH (187 mg, 7.80 mmol) in THF/MeOH/H2O (4/4/4 mL) was stirred for 4 h. A 15% citric acid solution (20 mL) was added, and the mixture was then extracted with EtOAc (3×). The combined extracts were washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue, compound 18f, was dried under reduced pressure for 18 h and was used without purification.

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