反应详情

温度

55 °C

The resultant ester may be hydrolyzed in the following manner: Mix 2-ethoxy-4′-[3-(propane-2-sulfonylamino)-thiophen-2-yl]-biphenyl-4-carboxylic acid ethyl ester (38 g, 80 mmol), in ethanol (100 mL) and NaOH 2 M in water (400 mL) and stir the reaction mixture for one hour at RT. Evaporate the ethanol and wash the aqueous mixture with 200 mL of EtOAc. Acidify the aqueous mixture to pH 2 using HCl 1N. Extract the desired product with EtOAc. Dissolve the crude in warmed acetone (500 ml) and add water (600 ml), maintaining the temperature at 55° C. Stir the mixture at 60° C. for 1 hour and then to RT. overnight. Filtrate the precipitate and dry under vacuum at 45° C. overnight. Yield 28 g, 78%. 1H NMR (300 MHz, DMSO): δ 1.14 (d, J=7.0 Hz, 6H), 1.31 (t, J=7.0 Hz, 3H), 3.06 (sept, J=7.0 Hz, 1H), 4.13 (q, J=7.0 Hz, 2H), 7.10 (d, J=5.3 Hz, 1H), 7.48 (d, J=7.6 Hz, 1H), 7.54 (d, J=5.3 Hz, 1H), 7.58-7.68 (m,4H), 7.72 (d, J=8.4 Hz, 2H), 9.22 (bs, 1H), 13.04 (bs, 1H).

1. customEvaporate the ethanol
2. washwash the aqueous mixture with 200 mL of EtOAc
3. extractionExtract the desired product with EtOAc
4. dissolutionDissolve the crude in warmed acetone (500 ml)
5. additionadd water (600 ml)
6. customto RT
7. customovernight
8. customFiltrate the precipitate and dry under vacuum at 45° C. overnight