[CH:1]1([C:5]2[C:14]([C:15]3[NH:19][C:18]([CH3:20])=[N:17][N:16]=3)=[CH:13][C:8]([C:9]([O:11]C)=[O:10])=[C:7]([CH3:21])[CH:6]=2)[CH2:4][CH2:3][CH2:2]1.[OH-].[Na+].Cl>CO>[CH:1]1([C:5]2[C:14]([C:15]3[NH:19][C:18]([CH3:20])=[N:17][N:16]=3)=[CH:13][C:8]([C:9]([OH:11])=[O:10])=[C:7]([CH3:21])[CH:6]=2)[CH2:2][CH2:3][CH2:4]1To a solution of methyl 4-cyclobutyl-2-methyl-5-(5-methyl-4H-1,2,4-triazol-3-yl)benzoate (compound 152.7, 240 mg, 0.842 mmol) in methanol (5 mL) was added aqueous NaOH (6 mL, 1M). The resulting mixture was heated to 50° C. for 6 hours. After cooling to ambient temperature, the reaction mixture was acidified with 1N HCl to pH 2 and extracted with ethyl acetate (3×50 mL). The combined organic layers were washed with brine (50 mL), dried over Na2SO4, and concentrated in vacuo to afford 4-cyclobutyl-2-methyl-5-(5-methyl-4H-1,2,4-triazol-3-yl)benzoic acid (260 mg, quantitative) as a white solid. m/z (ES+) 272 (M+H)+.
読み込み中…
