Reacción #2028903

Ecuación de reacción

THF

4-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-carboaldehyde

THF

methoxymethyltriphenylphosphonium chloride

Potassium t-butoxide

→

4-ethoxy-2,2′,3,3′-tetrafluoro-4′-(2-methoxyvinyl)biphenyl

Rendimiento 94.5%

Disolventes

water

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwas added dropwise
2. 2
   workup.WAITthe stirring was continued for 1 hour
3. 3
   TemperaturaThe reaction mixture was warmed to room temperature
4. 4
   Otroto give two layers
5. 5
   ExtracciónThe water layer was extracted with toluene (100 ml) three times
6. 6
   Lavadothe combined organic layer was washed with water
7. 7
   Secadodried over anhydrous magnesium sulfate
8. 8
   workup.DISTILLATIONThe solvent was distilled off under reduced pressure
9. 9
   OtroThe residue was purified by silica gel chromatography (silica gel: 20 g, eluent: toluene)

Procedimiento

THF (150 ml) was added to methoxymethyltriphenylphosphonium chloride (26.8 g) in a reaction vessel under an atmosphere of nitrogen and the solution was cooled to −20° C. Potassium t-butoxide (10.1 g) was added, and the stirring was continued for 1 hour. A THF (100 ml) solution of 4-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-carboaldehyde (7) (17.9 g) prepared in the fifth step was added dropwise, and the stirring was continued for 1 hour. The reaction mixture was warmed to room temperature and water (200 ml) was added to give two layers. The water layer was extracted with toluene (100 ml) three times, and the combined organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (silica gel: 20 g, eluent: toluene) to give 4-ethoxy-2,2′,3,3′-tetrafluoro-4′-(2-methoxyvinyl)biphenyl (8) (18.5 g) in 94.5% yield.

Fuente