反应详情

3-[Cyclopropyl-(2,4-dichloro-benzoyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester (85 mg, 0.19 mmol) was dissolved in a mixture of THF-MeOH—H2O (3:2:1) (10 mL) and then 1.2 ml of LiOH 1N was added to it. After 60 min of stirring at room temperature, solvent was removed and then partitioned between 15 ml of H2O, 4 ml of KHSO4 5% and 15 ml of EtOAc. The organic layer was separated and the aqueous phase was washed twice with ethyl acetate (2×10 mL). The combined ethyl acetate layer was dried (MgSO4), concentrated and the residue was purified by preparative chromatography (10% MeOH/CH2Cl2) to obtain 22 mg (27%) of 3-[Cyclopropyl-(2,4-dichloro-benzoyl)-amino]-5-phenyl-thiophene-2-carboxylic acid. NMR 1H (DMSO, 400 MHz): rotamer: 7.75 ppm (m, 2H, Haro); 7.68 ppm (m Haro, minor rotamer); 7.62-7.55 ppm (m, 2H, Haro); 7.52 ppm (m, Haro, minor rotamer); 7.48-7.27 ppm (m, 5H, Haro); 3.14 ppm (m, minor rotamer); 3.04 ppm (m, 1H, major rotamer); 0.87-0.42 ppm (m, 4H).

1. customsolvent was removed
2. custompartitioned between 15 ml of H2O, 4 ml of KHSO4 5% and 15 ml of EtOAc
3. customThe organic layer was separated
4. washthe aqueous phase was washed twice with ethyl acetate (2×10 mL)
5. dry with materialThe combined ethyl acetate layer was dried (MgSO4)
6. concentrationconcentrated
7. customthe residue was purified by preparative chromatography (10% MeOH/CH2Cl2)