Реакция #2028912

Уравнение реакции

Dichloromethane

6-propyl-3-(2,2′,3,3′-tetrafluoro-4′-(6-pentyltetrahydro-2H-pyran-3-yl)biphenyl-4-yl)tetrahydro-2H-pyran-2-ol

→

2-pentyl-5-(2,2′,3,3′-tetrafluoro-4′-(6-propyltetrahydro-2H-pyran-3-yl)biphenyl-4-yl)tetrahydro-2H-pyran

Выход 25.8%

Растворители

water

Условия реакции

Обработка

1. 1
   Другоеprepared in the second step
2. 2
   workup.ADDITIONTiethylsilane (0.27 g) and a boron trifluoride-diethyl ether complex (0.49 g) were added dropwise to the solution at −30° C
3. 3
   Другоеto give two layers
4. 4
   ПромывкаThe organic layer was washed with water
5. 5
   Сушкаdried over anhydrous magnesium sulfate
6. 6
   workup.DISTILLATIONThe solvent was distilled off under reduced pressure
7. 7
   ДругоеThe residue was purified by silica gel chromatography (silica gel: 20 g, eluent: heptane/ethyl acetate=50/50 by volume)
8. 8
   Другоеby recrystallization (heptane/ethyl acetate=90/10 by volume)

Методика

Dichloromethane (10 ml) was added to 6-propyl-3-(2,2′,3,3′-tetrafluoro-4′-(6-pentyltetrahydro-2H-pyran-3-yl)biphenyl-4-yl)tetrahydro-2H-pyran-2-ol (21) (1.2 g) prepared in the second step. Tiethylsilane (0.27 g) and a boron trifluoride-diethyl ether complex (0.49 g) were added dropwise to the solution at −30° C. After 3 hours of stirring, water (10 ml) was added to give two layers. The organic layer was washed with water and 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: heptane/ethyl acetate=50/50 by volume), and then by recrystallization (heptane/ethyl acetate=90/10 by volume) to give 2-pentyl-5-(2,2′,3,3′-tetrafluoro-4′-(6-propyltetrahydro-2H-pyran-3-yl)biphenyl-4-yl)tetrahydro-2H-pyran (22) (0.3 g) in 25.8% yield.

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