[CH:1]([N:3]1[C:9]2[CH:10]=[CH:11][C:12]([C:14]3[CH:19]=[CH:18][C:17]([O:20][CH2:21][CH2:22][CH3:23])=[CH:16][CH:15]=3)=[CH:13][C:8]=2[CH:7]=[C:6]([C:24]([O:26]C)=[O:25])[CH2:5][CH2:4]1)=[O:2].[OH-].[Na+].Cl>C1COCC1.C(O)C>[CH:1]([N:3]1[C:9]2[CH:10]=[CH:11][C:12]([C:14]3[CH:19]=[CH:18][C:17]([O:20][CH2:21][CH2:22][CH3:23])=[CH:16][CH:15]=3)=[CH:13][C:8]=2[CH:7]=[C:6]([C:24]([OH:26])=[O:25])[CH2:5][CH2:4]1)=[O:2]In a mixture of THF and ethanol (1:1, v/v. 24.0 ml) was dissolved methyl 1-formyl-7-(4-propoxyphenyl)-2,3-dihydro-1H-1-benzazepine-4-carboxylate (501 mg). To the solution was added 1N sodium hydroxide solution (15.0 ml), and the mixture was stirred at room temperature for 16 hours. The mixture was a little concentrated, and to the residue was added 1N hydrochloric acid to convert weakly acidic solution. The mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried with anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give crystals, which were washed with ethyl acetate/hexane to give 1-formyl-7-(4-propoxyphenyl)-2,3-dihydro-1H-1-benzazepine-4-carboxylic acid (482 mg) as white crystals.
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