O.[C:2]([O-:9])(=[O:8])[C:3]([C:5]([O-:7])=[O:6])=O.[Na+].[Na+].Cl.[F:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[NH:20][NH2:21].C(OCC)(=O)C>Cl.O>[F:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[NH:20][N:21]=[C:3]([C:5]([OH:7])=[O:6])[C:2]([OH:9])=[O:8]Sodium mesoxalate monohydrate (2.21 g, 12.3 mmol) was dissolved in 1 M hydrochloric acid (50 ml) to give a colourless cloudy solution. 2-Fluorophenylhydrazine hydrochloride (2.00 g, 12.3 mmol) was added portionwise at room temperature to the stirred mixture. A yellow precipitate formed, the mixture was diluted with water (50 ml) and stirring continued overnight. Ethyl acetate (150 ml) was added, the phases were mixed vigorously until the solids had dissolved. The phases were separated and the aqueous phase was washed with ethyl acetate (50 ml). The combined organic phases were dried over magnesium sulfate, filtered and the solvent removed under vacuum. The title compound was isolated as a yellow powder (2.55 g, 11.7 mmol, 92%). LCMS: m/z 227 [M−H]+.
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