Br[C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][N:3]=1.ClCCl.[CH3:12][N:13](C)C=O>C(OCC)(=O)C.[C-]#N.[Zn+2].[C-]#N.[Zn].Cl[Pd]Cl.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2]>[CH3:8][C:5]1[CH:6]=[CH:7][C:2]([C:12]#[N:13])=[N:3][CH:4]=1
A mixture of 2-bromo-5-methylpyridine (2.001 g, 11.63 mmol), zinc cyanide (830 mg, 7 mmol), zinc (dust, 35 mg, 0.53 mmol), [1,1′-bis(diphenylphosphino)ferrocene] dichloropalladium(II), complex with dichloromethane (1:1) (192.5 mg, 0.24 mmol) in N,N-dimethylformamide (10 mL) was heated at reflux for 16 hours. After cooling, the reaction was diluted with ethyl acetate and extracted with water and brine. The organic solution was filtered through a plug of silica gel, washing dichloromethane. Removal of the solvent in vacuo, afforded 770 mg (56%) of 5-methyl-2-cyano-pyridine.
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