反应详情

NaOH (100 mL, 2 M aqueous solution, 200 mmol) was added to a solution of 2-bromo-5-[(4-chloro-phenyl)-5-chloro-2-methyl-phenylamino]-1-isopropyl-1H-imidazole-4-carboxylic acid ethyl ester (step E2; 5.0 g, 9.6 mmol) in THF (100 mL) and MeOH (100 mL) at rt and reactants were stirred at rt for 2 h. THF and MeOH were evaporated, then the mixture was diluted in EtOAc/H2O and the pH was adjusted to 5 with diluted HCl. The aqueous layer was extracted once with EtOAc. The organic extract was dried (Na2SO4) and concentrated to afford an off-white foam; ESI-MS: 598.2 [M+H]+ (LC-MS 2); 1H-NMR (DMSO-d6, 400 MHz) δ ppm 1.20 (d, J=18.38 Hz, 3 H) 1.44 (d, J=6.65 Hz, 3 H) 2.16 (s, 3 H) 4.97 (d, J=7.04 Hz, 1 H) 6.62 (dd, J=7.82, 1.95 Hz, 2 H) 6.78 (d, J=2.35 Hz, 1 H) 7.03 (d, J=7.82 Hz, 1 H) 7.27 (m, 2 H) 7.42 (m, J=8.60 Hz, 2 H).

1. customTHF and MeOH were evaporated
2. additionthe mixture was diluted in EtOAc/H2O
3. extractionThe aqueous layer was extracted once with EtOAc
4. extractionThe organic extract
5. dry with materialwas dried (Na2SO4)
6. concentrationconcentrated
7. customto afford an off-white foam