[H-].[Na+].[Cl:3][C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[NH:9][C:8]([C:13]1[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][CH:14]=1)=[C:7]2[CH2:20][CH2:21][C:22]([OH:24])=[O:23].O.[CH3:26]N(C)C=O>>[Cl:3][C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[N:9]([CH3:26])[C:8]([C:13]1[CH:14]=[CH:15][C:16]([Cl:19])=[CH:17][CH:18]=1)=[C:7]2[CH2:20][CH2:21][C:22]([OH:24])=[O:23]Sodium hydride (60% suspension in mineral oil, 5.98 g) was added in portions to a stirred, cooled (0° C.) solution of 5-chloro-2-(4-chlorophenyl)-1H-indole-3-propanoic acid (Description 11, 10 g, 30 mmol) in dimethylformamide (100 mL) and the mixture was stirred at 0° C. for 30 min. lodomethane (9 mL) was added and the mixture was stirred at room temperature for 30 min. Water (1.5 L) was added and the mixture was extracted with ether (3×400 mL). The combined organic fractions were dried (MgSO4) and the solvent was evaporated under reduced pressure. The residue was dissolved in methanol (240 mL) and aqueous sodium hydroxide (4M, 60 mL) was added. The mixture was heated under reflux for 1 h., cooled and the pH was adjusted to 1.0 with hydrochloric acid (2M). The layers were separated and the aqueous layer was extracted with ethyl acetate. The combined organic fractions were dried (MgSO4) and the solvent was evaporated under reduced pressure. The residue was triturated with hexane and the solid was collected and dried in vacuo to give the the title compound (7.5 g, 72%). 1H NMR (360 MHz, CDCl3) δ2.54-2.59 (2H, m), 2.96-3.00 (2H, m), 3.53 (3H, s), 7.18-7.30 (4H, m), 7.44-7.48 (2H, m), and 7.58 (1H, d, J 1.8 Hz).
Wird geladen…
