反应详情

Ethyl 1-methyl-4-[2-(4-trifluoromethyl-phenylsulfanyl)-ethoxycarbonylamino]-1H-imidazole-2-carboxylate (0.69 g, 1.65 mmol) prepared in the capping step was dissolved in THF/H2O (27.40 ml/13.70 ml), 1N LiOH (4.57 ml) was added thereto, and the mixture was stirred at room temperature. After 15 hours have passed, the reaction solution was acidified to pH 2.0 by 1N HCl and then extracted with EA and water. The organic layer was washed with aqueous NaCl solution, dried over anhydrous MgSO4, and concentrated. The residue was recrystallized from EA and n-hexane to give 1-methyl-4-[2-(4-trifluoromethyl-phenylsulfanyl)-ethoxycarbonylamino]-1H-imidazole-2-carboxylic acid (0.52 g, 80.94%) of a white solid.

1. extractionextracted with EA and water
2. washThe organic layer was washed with aqueous NaCl solution
3. dry with materialdried over anhydrous MgSO4
4. concentrationconcentrated
5. customThe residue was recrystallized from EA and n-hexane