Reacción #78441

Ecuación de reacción

6-bromo-4-(3-ethoxy-phenyl)-1H-quinolin-2-one

trimethyloxonium tetrafluoroborate

NaOH

→

23A

Rendimiento 58.2%

6-Bromo-4-(3-ethoxy-phenyl)-2-methoxy-quinoline

Rendimiento 58.2%

Disolventes

dichloroethane

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaAfter cooling to 0° C.
2. 2
   workup.STIRRINGThe reaction mixture was stirred for another six hours at ambient temperature
3. 3
   OtroIt was then partitioned between dichloromethane and water
4. 4
   LavadoThe organic layer was washed brine
5. 5
   Secadodried over MgSO4
6. 6
   Filtraciónfiltered
7. 7
   Concentraciónconcentrated under vacuum
8. 8
   Otroto give an off-white solid
9. 9
   OtroThe solid was chromatographed on flash silica gel eluting with dichoromethane

Procedimiento

To a suspension of 6-bromo-4-(3-ethoxy-phenyl)-1H-quinolin-2-one (7.4 g, 21.5 mmol) in 60 ml dichloroethane was added trimethyloxonium tetrafluoroborate (BF4OMe3, 3.66 g, 24.7 mmol). The resulting mixture was stirred at ambient temperature overnight. After cooling to 0° C., was added 60 ml of 10% aqueous NaOH dropwise. The reaction mixture was stirred for another six hours at ambient temperature. It was then partitioned between dichloromethane and water. The organic layer was washed brine, dried over MgSO4, filtered and concentrated under vacuum to give an off-white solid. The solid was chromatographed on flash silica gel eluting with dichoromethane to yield the titled compound of 23A as a white solid (4.48 g, 58% yield).

Fuente