反应详情

Lithium hydroxide monohydrate (68.5 mg, 1.630 mmol) was added to a suspension of ethyl 6-(N-(3-bromophenyl)methylsulfonamido)-5-cyclopropyl-2-(4-fluorophenyl)benzofuran-3-carboxylate (311 mg, 0.543 mmol) in THF:MeOH:water/3:1:1 (10 mL). The mixture was stirred at room temperature overnight. The mixture was acidified with 2N aqueous HCl and the volatile solvents were evaporated. The residue was partitioned between EtOAc and water. The organic layers were washed with brine, dried over sodium sulfate and concentrated to give 6-(N-(3-bromophenyl)methylsulfonamido)-5-cyclopropyl-2-(4-fluorophenyl)benzofuran-3-carboxylic acid (309 mg, quantitative) as a yellow solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.01-8.13 (m, 2H) 7.77 (s, 1H) 7.66 (s, 1H) 7.54 (t, J=1.95 Hz, 1H) 7.39 (dd, J=8.21, 1.37 Hz, 1H) 7.30-7.36 (m, 1H) 7.17-7.26 (m, 3H) 3.27 (s, 3H) 2.11 (s, 1H) 0.74-1.18 (m, 3H) 0.48-0.74 (m, 1H). LCMS (m/z, ES+)=544, 546 (M+H, M+2).

1. customthe volatile solvents were evaporated
2. customThe residue was partitioned between EtOAc and water
3. washThe organic layers were washed with brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated