[CH3:1][O:2][C:3]1[N:8]=[C:7]([C:9]([OH:11])=O)[CH:6]=[CH:5][CH:4]=1.C(Cl)(=O)C([Cl:15])=O>C(Cl)Cl>[CH3:1][O:2][C:3]1[N:8]=[C:7]([C:9]([Cl:15])=[O:11])[CH:6]=[CH:5][CH:4]=1To a mixture of 5.00 g (32.7 mmol) 6-methoxy-pyridine-2-carboxylic acid in 100 mL DCM was added 40.8 mL (81.6 mmol) 2 M oxalyl chloride solution in DCM and stirred at 40° C. for 2 h. The solvent was removed by distillation.
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