反应详情

温度

60 °C

To a solution of (E)-methyl 4-amino-6-chloro-5-fluoro-3-(2-(trimethylsilyl)vinyl)picolinate (176 mg, 0.581 mmol) in DMF (2.3 mL) was added N-chlorosuccinimide (116 mg, 0.872 mmol). The reaction mixture was stirred at 60° C. After 4 h, the observed conversion was ˜50%. At this point, the reaction mixture was poured into water (30 mL) and extracted with EtOAc (3×). The combined organic layers were dried over Na2SO4, filtered, and concentrated. The crude product was purified by flash column chromatography (SiO2, hexane/EtOAc gradient) to afford the title compound (75 mg, 0.283 mmol, 48.7% yield) as an orange solid: mp 128-130° C.; 1H NMR (400 MHz, CDCl3) δ 6.97 (d, J=14.1 Hz, 1H), 6.45 (d, J=14.1 Hz, 1H), 4.73 (s, 2H), 3.93 (s, 3H); 19F NMR (376 MHz, CDCl3) δ −138.17; ESIMS m/z 265 ([M]+).

1. extractionextracted with EtOAc (3×)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe crude product was purified by flash column chromatography (SiO2, hexane/EtOAc gradient)