Reacción #2028908

Ecuación de reacción

Dichloromethane

3-(4′-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-yl)-6-(4-propylcyclohexyl)tetrahydropyran-2-ol

Triethylsilane

→

5-(4′-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-yl)-2-(4-propylcyclohexyl)tetrahydropyran

Rendimiento 36.1%

Disolventes

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroprepared in the tenth step
2. 2
   Otroto give two layers
3. 3
   LavadoThe organic layer was washed with water
4. 4
   Secadodried over anhydrous magnesium sulfate
5. 5
   workup.DISTILLATIONThe solvent was distilled off under reduced pressure
6. 6
   OtroThe residue was purified by silica gel chromatography (silica gel: 200 g, eluent: heptane/ethyl acetate=80/20 by volume)
7. 7
   Otroby recrystallization (heptane/ethyl acetate=90/10 by volume)

Procedimiento

Dichloromethane (30 ml) was added to 3-(4′-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-yl)-6-(4-propylcyclohexyl)tetrahydropyran-2-ol (12) (2.29 g) prepared in the tenth step. Triethylsilane (1.93 g) and a boron trifluoride-diethyl ether complex (2.37 g) were added dropwise to the solution at −30° C. After 3 hours of stirring, water (30 ml) was added to give two layers. The organic layer was washed with water, dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (silica gel: 200 g, eluent: heptane/ethyl acetate=80/20 by volume) and then by recrystallization (heptane/ethyl acetate=90/10 by volume) to give 5-(4′-ethoxy-2,2′,3,3′-tetrafluorobiphenyl-4-yl)-2-(4-propylcyclohexyl)tetrahydropyran (13) (0.8 g) in 36% yield.

Fuente