[CH:1]([C:3]1[CH:4]=[CH:5][C:6]([O:13][CH3:14])=[C:7]([CH:12]=1)[C:8]([O:10][CH3:11])=[O:9])=O.Cl.[NH2:16][OH:17].C([O-])(=O)C.[Na+]>C(O)C.O>[OH:17][N:16]=[CH:1][C:3]1[CH:4]=[CH:5][C:6]([O:13][CH3:14])=[C:7]([CH:12]=1)[C:8]([O:10][CH3:11])=[O:9]Methyl 5-formyl-2-methoxybenzoate 1.0 g, 5.15 mmol), hydroxylamine hydrochloride (1.8 g, 25.75 mmol) and sodium acetate (2.1 g, 25.75 mmol) were combined in a ethanol/water mixture (1:1, 40 mL) and stirred at 50° C. for 1 h. After cooling to room temperature, the reaction mixture was poured in to ice water and extracted with methylene chloride (2×). The combined organic layers were washed with brine (2×), dried over sodium sulfate and concentrated to afford 1.04 g (97%) which was used without purification. LC/MS (HPLC method 3): tR=1.63 min, 210.06 (MH)+.
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