[CH2:1]([NH2:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Br:9][C:10]1[C:19](Br)=[C:18]2[C:13]([CH:14]=[CH:15][C:16]([O:21][CH3:22])=[N:17]2)=[N:12][CH:11]=1.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>CN(C)C=O>[CH2:1]([NH:8][C:19]1[C:18]2[C:13](=[CH:14][CH:15]=[C:16]([O:21][CH3:22])[N:17]=2)[N:12]=[CH:11][C:10]=1[Br:9])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Benzylamine (67 mg, 0.63 mmol, 2.0 eq) is added at room temperature to a stirred solution of 7,8-dibromo-2-methoxy-[1,5]naphthyridine (100 mg, 0.31 mmol, 1.0 eq) in N,N-dimethylformamide (10 mL), followed by potassium carbonate (87 mg, 0.63 mmol, 2.0 eq). After 2 hours stirring at 120° C., solvent is removed and the residue is extracted with ethyl acetate (3×10 mL) and water (10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give the crude product that is purified by column chromatography (silica gel, eluent: petroleum ether:ethyl acetate, 5:1, v/v) to afford benzyl-(3-bromo-6-methoxy-[1,5]naphthyridin-4-yl)-amine as a light yellow solid (50 mg, 46% yield).
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