Sodium Carbonate → 4-Chloro-6-(2,6-diethylphenyl)-2-trifluoromethyl-nicotinic acid methyl ester

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Reaction Steps

A mixture of 4,6-dichloro-2-trifluoromethyl-nicotinic acid methyl ester (1.0 g, 3.7 mmol), 2,6-diethyl-phenyl boronic acid (0.78 g, 4.4 mmol), sodium carbonate (2 M aqueous solution, 4.4 mL, 8.8 mmol), and Pd(PPh3)4 (206 mg, 0.18 mmol) is refluxed in toluene for 48 hours and then cooled to room temperature. The organic layer is separated and the aqueous layer is extracted with ethyl acetate (2×50 mL). The combined organic layers are dried and the solvent removed. The crude product is purified by flash column (hexanes/ethyl acetate 8:1) to give 4-chloro-6-(2,6-diethyl-phenyl)-2-trifluoromethyl-nicotinic acid methyl ester as a white solid. 1H NMR: (CDCl3) 7.58 (s, 1H), 7.25 (t, 1H), 7.20 (d, 2H), 4.02 (s, 2.28 (q, 4H), 1.04 (t, 6H).

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