Br[C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[CH:4][N:3]=1.[F:9][C:10]1[CH:15]=[C:14]([F:16])[CH:13]=[CH:12][C:11]=1B(O)O.C(=O)([O-])[O-].[K+].[K+].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>O.C(O[Pd]OC(=O)C)(=O)C.CO.C(#N)C>[Br:8][C:5]1[CH:6]=[CH:7][C:2]([C:13]2[CH:12]=[CH:11][C:10]([F:9])=[CH:15][C:14]=2[F:16])=[N:3][CH:4]=1
One 1.0 L round bottom flask was charged with 2,5-dibromopyridine (10.45 g, 44.1 mmol); (2,4-difluorophenyl) boronic acid (7.66 g, 48.5 mmol); potassium carbonate (12.19 g, 88 mmole); diacetoxypalladium (0.495 g, 2.206 mmol); triphenylphosphine (1.157 g, 4.41 mmol); and acetonitrile (348 ml) and MeOH (174 ml). The reaction mixture was heated to 40° C. for 40 hours. The reaction mixture was diluted with deionized water and extracted with ethyl acetate. The organic portion was combined and subjected to column chromatography (SiO2 gel, 10% EtOAc in heptane) to yield the desired compound, 5-bromo-2-(2,4-difluorophenyl)pyridine (10 g; 84%).
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