[CH3:1][O:2][C:3](=[O:13])[C:4]1[C:9]([CH3:10])=[CH:8][C:7]([Cl:11])=[N:6][C:5]=1Cl.C[O-].[Na+].[C:17](O)(=[O:19])C>C(Cl)Cl>[CH3:1][O:2][C:3](=[O:13])[C:4]1[C:9]([CH3:10])=[CH:8][C:7]([Cl:11])=[N:6][C:5]=1[O:19][CH3:17]To a solution of 6.50 g (29.5 mmol) of 2,6-dichloro-4-methyl-nicotinic acid methyl ester in 75 ml of CH2Cl2 was added at 0° C. 6.56 ml (35.4 mmol) of a sodium methoxide solution (5.4 molar in MeOH). After 16 hours, the reaction mixture was warmed up to RT and stirred again 16 hours at this temperature and subsequently poured into crashed ice; then, the pH was adjusted to 4-5 with 2N acetic acid and the reaction mixture was extracted twice with CH2Cl2; the organic phases were washed with water, dried over magnesium sulfate, filtered and evaporated. The residue was purified by flash column chromatography (heptane/EtOAc 1.0 to 98:2) to give 5.79 g (91%) of the title compound as colorless solid. MS: 216.1 (MH+, 1Cl).
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