[CH3:1][N:2]1[C:6]([C:7]([O:9]C)=[O:8])=[CH:5][C:4]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)=[N:3]1.[OH-].[Na+]>C(O)C.O>[CH3:1][N:2]1[C:6]([C:7]([OH:9])=[O:8])=[CH:5][C:4]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)=[N:3]1Methyl 1-methyl-3-phenylpyrazole-5-carboxylate (3 g) was dissolved in a mixed solvent of ethanol (20 ml) and water (20 ml) and sodium hydroxide (0.7 g) was added. The mixture was stirred at a refluxing temperature for 30 min. Ethanol was evaporated and to the residue was added dilute hydrochloric acid. The obtained solid was recrystallized from aqueous methanol solution to give the title compound (0.8 g), melting point: 189° C.
Wird geladen…
