Methyl 4-amino-5-fluoro-6-vinylpicolinate → Methyl 4-amino-6-ethyl-5-fluoropicolinate

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Reaction Steps

Pd/C (0.976 g, 0.459 mmol) was added to a 500 mL Parr bottle and methyl 4-amino-5-fluoro-6-vinylpicolinate (0.9 g, 4.59 mmol) dissolved in ethanol (50 ml) was added. The Parr bottle was placed on a Parr shaker, purged with nitrogen gas three times, and pressurized to 43 psi with hydrogen gas. The reaction mixture was shaken on the Parr Shaker for 45 min The catalyst was removed via filtration through celite. The celite was washed with ethyl acetate. The filtrates were combined and concentrated under vacuum to provide the title compoud as a white solid (820 mg, 4.14 mmol, 90% yield); 1H NMR (400 MHz, DMSO-d6) δ 1.17 (t, J=7.6 Hz, 3H), 2.68 (qd, J=7.6, 2.7 Hz, 2H), 3.80 (s, 3H), 6.39 (s, 2H), 7.34 (d, J=6.7 Hz, 1H; 19F NMR (376 MHz, DMSO-d6) δ −147.65; ESIMS m/z 199 ([M+H]+), 197 ([M−H]−).

Provenance & Evidence