Lithium Hydroxide → 3-[2-Bromo-4-(trifluoromethyl)phenylsulfonamido]thiophene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 97 (330.0 mg; 0.74 mmol) in tetrahydrofuran (8 mL) and methanol (2 mL) was added aqueous lithium hydroxide (4 mL; 2M). The reaction mixture was heated at 75-80° C. for 6 hours, allowed to cool to room temperature and then concentrated under reduced pressure. The resulting residue was dissolved in chloroform (15 mL) and washed with aqueous hydrochloric acid (2×10 mL; 2N). The organic phase was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude residue was purified by preparative HPLC to afford the title compound as a white solid (110 mg).

Provenance & Evidence