Citric Acid → HCID 57901637, compound

Participants

Reaction Steps

To a mixed solution of ethyl 4-fluoro-1-(methoxymethyl)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylate (0.45 g) in tetrahydrofuran (10 mL)-methanol (10 mL) was added aqueous solution (5 mL) of 85% potassium hydroxide (0.25 g), and the mixture was stirred at room temperature for 18 hr. The reaction solution was acidified with aqueous citric acid solution, extracted with ethyl acetate, washed with water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to give the title compound (0.41 g, yield 98%) as pale-yellow crystals.

Provenance & Evidence