反应详情

A A mixture of 24 mg of 5-bromo-1-(2,6-dichlorophenyl)-3,4-dihydro-7-methoxy-2(1H)-quinolinone (INTERMEDIATE 1), 28 mg of 2,4-difluorophenylboronic acid, 3 mg of Pd(Ph3P)4, and 0.15 mL of a 1M aqueous Na2CO3 solution in 2 mL of toluene and 0.2 mL of EtOH in a 10 mL flask equipped with a reflux condenser was evacuated and purged three times with Ar. The mixture was heated to reflux and stirred at this temperature for 3.5 h, then cooled and diluted with 15 mL EtOAc and 10 mL of saturated aqueous NaHCO3. The phases were separated and the organic phase was dried over MgSO4 and concentrated. The resulting residue was purified by preparative thin-layer chromatography, eluting with 3:1 hexanes-EtOAc, to yield 1-(2,6-Dichlorophenyl)-5-(2,4-difluorophenyl)-3,4-dihydro-7-methoxy-2(1H)-quinolinone. Mass spectrum (ESI) 434.0 (M+1). 1H NMR (500 MHz, CDCl3): δ 7.50 (d, J=8.0 Hz, 2H); 7.35 (t, J=8.0 Hz, 1H), 7.32 (m, 1H); 6.96, (m, 2H); 6.52 (d, J=2.5 Hz, 1H); 5.89 (d, J=2.5 Hz, 1H); 3.69 (s, 3H); 2.64-3.00 (m, 4H).

1. customequipped with a reflux condenser
2. customwas evacuated
3. custompurged three times with Ar
4. temperatureThe mixture was heated
5. temperatureto reflux
6. temperaturecooled
7. additiondiluted with 15 mL EtOAc and 10 mL of saturated aqueous NaHCO3
8. customThe phases were separated
9. dry with materialthe organic phase was dried over MgSO4
10. concentrationconcentrated
11. customThe resulting residue was purified by preparative thin-layer chromatography
12. washeluting with 3:1 hexanes-EtOAc