反应详情

A mixture of 2-chloro-N-(2-chloro-3-fluoropyridin-4-yl)-4-cyano-6-fluorobenzimidoyl chloride (0.713 g, 2.05 mmol), thiourea (0.623 g, 8.2 mmol) and pyridine (538 μL, 6.66 mmol) in isopropanol (7 mL) was heated under reflux for 3 hours. The reaction mixture was allowed to cool to ambient temperature before adding triethylamine (1.7 mL, 12.3 mmol). The resulting mixture was heated under reflux for a further 3 hours and allowed to cool. The mixture was concentrated under reduced pressure and the residue was partitioned between DCM and water. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The crude residue was purified by silica gel flash chromatography (0-10% EtOAc in pentane) to give the desired compound as an off-white solid (0.356 g, 53% yield). 1H NMR (300 MHz, CDCl3): δ 8.55 (d, J=5.6 Hz, 1H), 8.01 (d, J=5.6 Hz, 1H), 7.72 (t, J=1.4 Hz, 1H), 7.52 (dd, J=8.3, 1.5 Hz, 1H). LCMS (Method D): RT=3.86 min, m/z: 324 [M+H+].

1. temperaturewas heated
2. temperatureunder reflux for 3 hours
3. temperatureThe resulting mixture was heated
4. temperatureunder reflux for a further 3 hours
5. temperatureto cool
6. concentrationThe mixture was concentrated under reduced pressure
7. customthe residue was partitioned between DCM and water
8. dry with materialThe organic layer was dried over Na2SO4
9. concentrationconcentrated under reduced pressure
10. customThe crude residue was purified by silica gel flash chromatography (0-10% EtOAc in pentane)