Citric Acid → HCID 57901620, compound

Participants

Reaction Steps

To a mixed solution of ethyl 7-({3,5-bis[(2-fluorobenzyl)oxy]benzoyl}amino)-1H-indole-2-carboxylate (170 mg) in tetrahydrofuran (8 mL)-methanol (8 mL) was added aqueous solution (5 mL) of 85% potassium hydroxide (150 mg), and the mixture was stirred at room temperature for 18 hr. Aqueous citric acid solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate, washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained crystals were washed with ethyl acetate-hexane to give the title compound (147 mg, yield 91%) as colorless crystals. melting point 271-273° C.

Provenance & Evidence