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Preparation of 6-[(dimethylamino)carbonyl]-3-pyridine carboxylic acid. To a 2° C. slurry of dimethyl 2,5-pyridinedicarboxylate (50 g, 0.256 mol) in THF (700 mL) was added magnesium chloride (26.8 g, 0.282 mol). After stirring for 15 min, dimethylamine (2 M in THF, 256 mL, 0.512 mol) was added dropwise over 40 min. The mixture was stirred for 30 min at 2° C. and then at room temperature for 1 h. To the mixture was added water (100 mL) and 1 N HCl (300 mL). The mixture was extracted with ethyl acetate (4×400 mL). The combined organic layers were dried (MgSO4) and concentrated in vacuo to provide 53 g (100%) of methyl 6-[(dimethylamino)carbonyl]-3-pyridine carboxylate a pale yellow solid.

1. stirringThe mixture was stirred for 30 min at 2° C.
2. waitat room temperature for 1 h
3. extractionThe mixture was extracted with ethyl acetate (4×400 mL)
4. dry with materialThe combined organic layers were dried (MgSO4)
5. concentrationconcentrated in vacuo