Stannane, tributyl-(1Z)-1-propen-1-yl- → (Z)-methyl 4-amino-6-chloro-5-fluoro-3-(prop-1-en-1-yl)picolinate

Participants

Reaction Steps

Methyl 4-amino-6-chloro-5-fluoro-3-iodopicolinate (0.4 g, 1.210 mmol), (E)-tributyl(prop-1-en-1-yl)stannane (0.481 g, 1.452 mmol), and bis(triphenylphosphine)palladium(II) chloride (0.085 g, 0.121 mmol) in dichloroethane (2.42 mL) were irradiated at 120° C. for 30 min in a microwave reactor. Celite was then added to the reaction mixture and the solvent was removed under vacuum. The crude product was first purified by flash column chromatography (SiO2, hexane/EtOAc gradient) then by reverse phase HPLC to afford the title compound as an orange oil: 1H NMR (400 MHz, CDCl3) δ 6.39 (dq, J=11.1, 1.7 Hz, 1H), 6.07 (dq, J=11.2, 6.9 Hz, 1H), 4.64 (s, 2H), 3.89 (s, 3H), 1.55 (dd, J=6.9, 1.7 Hz, 3H); 19F NMR (376 MHz, CDCl3) δ −139.48; EIMS m/z 245 ([M+H]+).

Provenance & Evidence