[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Br:8])[CH:7]=1.C(=O)([O-])[O-].[Cs+].[Cs+].CN1CCCC1=O.[NH:22]1[CH:26]=[CH:25][N:24]=[N:23]1>C(OCC)(=O)C.O>[Br:8][C:6]1[CH:5]=[N:4][CH:3]=[C:2]([N:23]2[N:24]=[CH:25][CH:26]=[N:22]2)[CH:7]=1.[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([N:22]2[CH:26]=[CH:25][N:24]=[N:23]2)[CH:7]=13,5-dibromopyridine (400 mg) and cesium carbonate (550 mg) were added to an N-methylpyrrolidone (4 ml) solution containing 1H-1,2,3-triazole (117 mg), followed by stirring at 100° C. for 21 hours. The reaction mixture was cooled to room temperature, and water and ethyl acetate were added. The organic layer was collected, washed with water and then with saturated saline, and dried over anhydrous magnesium sulfate, and the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel chromatography (hexane:ethyl acetate=10:0 to 2:3), and a white solid of 3-bromo-5-(2H-1,2,3-triazol-2-yl)pyridine (55 mg) and a white solid of 3-bromo-5-(1H-1,2,3-triazol-1-yl)pyridine (48 mg) were thus obtained.
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