C[O:2][C:3]([C:5]1[C:6]2[CH:7]=[CH:8][CH:9]=[N:10][C:11]=2[CH:12]=[C:13]([CH3:16])[C:14]=1[NH2:15])=[O:4].[OH-].[Na+]>O1CCOCC1.CO>[NH2:15][C:14]1[C:13]([CH3:16])=[CH:12][C:11]2[N:10]=[CH:9][CH:8]=[CH:7][C:6]=2[C:5]=1[C:3]([OH:4])=[O:2]To a solution of 550 mg (2.54 mmol) of 6-amino-7-methyl-quinoline-5-carboxylic acid methyl ester in 11 mL of dioxane and 0.5 mL of methanol, is added 6.4 mL (6.4 mmol) of an aqueous solution of NaOH 1N. The mixture is stirred at ambient temperature for 16 hours. The solvents are evaporated and water is added to the residue. The product is precipitated at pH 6 by addition of concentrated HCl, filtrated, washed with a minimum of water and dried on high vacuum pump. The yellow crude solid (282 mg) obtained is used directly in the next step; LC/MS: 203/204 (M+H)+.
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