反应详情

4-Amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)picolinic acid (prepared by the methods described in U.S. Pat. No. 7,314,849 B2; 828 mg, 2 5 mmol) was dissolved in DMF (4 mL). Sodium hydride (NaH, 60% disperson in mineral oil; 154 mg, 3.85 mmol) was added portion wise. To the mixture was added 2,4-dichloro-1-(chloromethyl)benzene (586 mg, 3.0 mmol). The reaction mixture was allowed to stir for 24 hours (h). Water was added to the reaction mixture, and the aqueous phase was extracted with EtOAc (×3). The combined organic extracts were washed with brine, dried with Na2SO4, filtered, and concentrated. Purification by normal phase chromatography gave a white solid (440 mg, 35%): mp 165-168° C., 1H NMR (400 MHz, CDCl3) δ 7.68 (dd, J=8.6, 7.8 Hz, 1H), 7.54 (d, J=8.3 Hz, 1H), 7.43 (d, J=2.1 Hz, 1H), 7.28 (d, J=2.1 Hz, 1H), 7.23 (d, J=1.8 Hz, 1H), 7.21 (d, J=1.6 Hz, 1H), 5.50 (s, 2H), 4.83 (s, 2H), 3.97 (d, J=0.8 Hz, 3H); ESIMS m/z 489 ([M−H]).

1. extractionthe aqueous phase was extracted with EtOAc (×3)
2. washThe combined organic extracts were washed with brine
3. dry with materialdried with Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by normal phase chromatography