[OH:1][CH2:2][C:3]1[CH:4]=[CH:5][C:6]([C:9]#[N:10])=[N:7][CH:8]=1.C(N(C(C)C)CC)(C)C.[CH3:20][S:21](Cl)(=[O:23])=[O:22]>C(Cl)Cl>[CH3:20][S:21]([O:1][CH2:2][C:3]1[CH:8]=[N:7][C:6]([C:9]#[N:10])=[CH:5][CH:4]=1)(=[O:23])=[O:22]To a solution of 5-(hydroxymethyl)picolinonitrile (1.59 g, 11.9 mmol) in 80 mL of DCM was added diisopropylethylamine (3.2 mL), followed by a solution of methanesulfonyl chloride (1.49 g, 13.0 mmol) in 20 mL of DCM at 0° C. The solution was stirred at 0° C. for 40 min and washed with 5% citric acid, sat. NaHCO3 (aq.) and brine. After concentration, the residue was purified by silica gel chromatography (elution with 0-30% EtOAc/Hex) to afford (6-cyanopyridin-3-yl)methyl methanesulfonate (2.33 g).
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