反应详情

温度

20 °C

To a solution of methyl 4-amino-3-chloro-6-(2,5-difluoro-4-(trimethylsilyl)phenyl)picolinate (0.210 g, 0.566 mmol) in CH2Cl2 (2.265 mL) at 20° C. was added bromine (0.117 mL, 2.265 mmol). The reaction mixture was stirred at 20° C. overnight. The mixture was then poured into a saturated aqueous solution of Na2S2O3 and extracted with EtOAc (3×). The combined organic layers were dried over Na2SO4, filtered and concentrated. The residue was purified by flash column chromatography (SiO2, hexanes/EtOAc gradient) to provide the title compound as a white solid (0.125 g, 49.1%): mp 165-166° C.; 1H NMR (400 MHz, CDCl3) δ 7.10 (dd, J=8.9, 4.0 Hz, 1H), 7.03 (dd, J=7.6, 5.1 Hz, 1H), 5.43 (s, 2H), 3.96 (s, 3H), 0.33 (d, J=0.7 Hz, 9H); ESIMS m/z 450 ([M+H]+).

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