[NH2:1][C:2]1[C:7]([NH2:8])=[CH:6][CH:5]=[C:4]([Br:9])[N:3]=1.[C:10](OCC)(OCC)(OCC)[CH3:11].C(=O)([O-])[O-].[K+].[K+]>C(O)(=O)C.ClCCl>[Br:9][C:4]1[N:3]=[C:2]2[N:1]=[C:10]([CH3:11])[NH:8][C:7]2=[CH:6][CH:5]=12,3-Diamino-6-bromopyridine (8.16 g) and triethyl orthoacetate (12.0 ml) were mixed in acetic acid (41 ml), and the mixture was refluxed under heating for 29 hr. The mixture was allowed to cool and the solvent was evaporated to give a crude product (10 g). This was dissolved in a sufficient amount of dichloromethane. Anhydrous potassium carbonate and active carbon were added and the mixture was stirred at room temperature. The insoluble matter was filtered off and the solvent was evaporated to give the objective compound (7.59 g) as a pale-yellow powder.
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