[CH2:1]([O:3][C:4](=[O:17])[CH:5]([C:9]([C:11]1[CH:16]=[CH:15][N:14]=[CH:13][CH:12]=1)=O)[C:6](=O)[CH3:7])[CH3:2].Cl.[NH2:19][NH2:20].Cl.C([O-])(O)=O.[Na+]>C(O)C.O.O1CCOCC1>[CH2:1]([O:3][C:4]([C:5]1[C:9]([C:11]2[CH:16]=[CH:15][N:14]=[CH:13][CH:12]=2)=[N:19][NH:20][C:6]=1[CH3:7])=[O:17])[CH3:2]To a solution of 3-oxo-2-(pyridine-4-carbonyl)-butyric acid ethyl ester (1 g, 4.25 mmol) in 10 ml ethanol, were added a solution of hydrazine hydrochloride (291 mg, 4.25 mmol) in 4 ml water and, then 0.1 ml of 4M HCl in dioxane. The yellow solution was stirred 1 h at room temperature, poured on a saturated solution of NaHCO3 and extracted twice with EtOAc. The organic phases were washed with brine, dried over magnesium sulfate, and evaporated to afford the title compound as light yellow solid (815 mg, 83%). MS: 232.1 (MH+).
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