反应详情

Methyl 4-(2-Fluoro-4-iodo-phenylamino)-thiophene-3-carboxylate (270 mg, 0.72 mmol) was dissolved in a mixture of tetrahydrofuran:methanol (6:1, 3 mL) and a solution of lithium hydroxide (0.1 g, 4.2 mmol) in 1 mL of water was added. The solution was stirred at room temperature for 18 hours and the solvent was concentrated. The residue was dissolved in 5 mL of water and the solution was acidified to pH 1 with 1N HCl. The resulting solid was filtered and dried in vacuo to provide 210 mg (79% yield) of 4-(2-fluoro-4-iodo-phenylamino)-thiophene-3-carboxylic acid. MS (EI) for C11H7FINO2S: 364 (MH+).

1. concentrationthe solvent was concentrated
2. dissolutionThe residue was dissolved in 5 mL of water
3. filtrationThe resulting solid was filtered
4. customdried in vacuo