Water → (E)-4-amino-6-(4-chloro-3-fluorophenyl)-5-fluoro-3-(2-(trimethylsilyl)vinyl)picolinic acid

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Reaction Steps

(E)-methyl 4-amino-6-(4-chloro-3-fluorophenyl)-5-fluoro-3-(2-(trimethylsilyl)vinyl)picolinate (169 mg, 0.426 mmol) was dissolved in methanol (2 mL), THF (2 mL) and Water (1 mL). Lithium hydroxide hydrate (93 mg, 2.216 mmol) was added. The reaction mixture was stirred at room temperature overnight. The reaction mixture was concentrated to dryness under vaccum. The resulting residue was partitioned between 1 N HCl and ethyl acetate. The aqueous phase was extracted three more times with ethyl acetate. The organic phases were combined, dried over magnesium sulfate, filtered, and concentrated under vacuum to provide the title compound as an off-white solid (146 mg, 0.381 mmol, 90% yield): 1H NMR (400 MHz, DMSO-d6) δ 0.17 (s, 9H), 6.26 (d, J=19.4 Hz, 1H), 6.49 (s, 2H), 6.93 (d, J=19.5 Hz, 1H), 7.68-7.83 (m, 2H), 7.88 (dd, J=10.9, 1.8 Hz, 1H); 19F NMR (376 MHz, DMSO-d6) δ −145.32 , −116.04 . ESIMS m/z 384 ([M+H]+).

Provenance & Evidence