Cl[CH2:2][C:3]1[C:4]([CH3:9])=[N:5][CH:6]=[CH:7][CH:8]=1.[C-:10]#[N:11].[Na+].O.C(OCC)(=O)C>CS(C)=O>[C:10]([CH2:2][C:3]1[C:4]([CH3:9])=[N:5][CH:6]=[CH:7][CH:8]=1)#[N:11]The mixture of 3-chloromethyl-2-methylpyridine (9.2 g) and sodium cyanide (9.55 g) in dimethyl sulfoxide (80 ml) was stirred for 30 minutes at 80° C. The reaction mixture was poured into a mixture of water (200 ml) and ethyl acetate (1 l). Organic layer was separated, washed with brine and dried over magnesium sulfate. Concentration of the solvent gave a residue, which was chromatographed on silica gel (300 ml) eluting with a mixture of hexane and ethyl acetate (1:4, V/V) to give 3-cyanomethyl-2-methylpyridine (7.6 g).
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