[C:1](Cl)(=O)[C:2]([Cl:4])=[O:3].[Br:7][C:8]1[CH:9]=[N:10][CH:11]=[C:12]2[C:17]=1[N:16]=C(C(O)=O)[CH:14]=[CH:13]2>>[Br:7][C:8]1[CH:9]=[N:10][CH:11]=[C:12]2[C:17]=1[N:16]=[C:1]([C:2]([Cl:4])=[O:3])[CH:14]=[CH:13]2Oxalyl chloride (1.5 equiv.) is added drop wise to a slurry of 8-Bromo-[1,6]naphthyridine-2-carboxylic acid (1 equiv., in 20 mL DMF) at 0° C. (ice bath) and stirred for 30 minutes. The reaction mixture is removed from the ice bath, stirred at room temperature for 3 h and then concentrated in vacuo to give a greenish colored solid, which is used immediately without further purification.
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