[CH3:1][N:2]1[CH:6]=[C:5]([C:7]2[N:12]=[CH:11][C:10]([C:13]([OH:15])=O)=[CH:9][CH:8]=2)[CH:4]=[N:3]1.S(Cl)([Cl:18])=O>>[CH3:1][N:2]1[CH:6]=[C:5]([C:7]2[N:12]=[CH:11][C:10]([C:13]([Cl:18])=[O:15])=[CH:9][CH:8]=2)[CH:4]=[N:3]1A suspension of 6-(1-methyl-1H-pyrazol-4-yl)pyridine-3-carboxylic acid (0.48 g) in thionyl chloride (5.0 ml) was stirred at room temperature for 2 hours. The volatile material was removed under reduced pressure to afford 6-(1-methyl-1H-pyrazol-4-yl)pyridine-3-carbonyl chloride as a solid, which was utilized without further purification.
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