Reaction #2446070

Reaction equation

Toluene

p-toluenesulfonic acid monohydrate

1-(4-ethoxy-2,3-difluorophenyl)-4-(3-propylcyclopentyl)cyclohexanol

→

1-ethoxy-2,3-difluoro-4-(4-(3-propylcyclopentyl)cyclohex-1-enyl)benzene

Yield 82.0%

Solvents

water

Conditions

Workup

1. 1
   Otherobtained in the first step, in a reaction vessel
2. 2
   Otherequipped with a Dean-Stark apparatus under an atmosphere of nitrogen
3. 3
   TemperatureThe mixture was refluxed for 1.5 hour
4. 4
   Otherwas removed with a Dean-Stark apparatus
5. 5
   Washthe reaction solution was washed with water
6. 6
   Dryingdried over anhydrous magnesium sulfate
7. 7
   workup.DISTILLATIONthe solvent was distilled off under reduced pressure
8. 8
   OtherThe residue was purified by silica gel chromatography (eluent: ethyl acetate/n-heptane= 1/10 by volume)

Procedure

Toluene (50 ml) and p-toluenesulfonic acid monohydrate (0.15 g) were added to 1-(4-ethoxy-2,3-difluorophenyl)-4-(3-propylcyclopentyl)cyclohexanol (5.0 g) obtained in the first step, in a reaction vessel equipped with a Dean-Stark apparatus under an atmosphere of nitrogen. The mixture was refluxed for 1.5 hour, while forming water was removed with a Dean-Stark apparatus. After the mixture had been cooled to room temperature, the reaction solution was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (eluent: ethyl acetate/n-heptane= 1/10 by volume) to give 1-ethoxy-2,3-difluoro-4-(4-(3-propylcyclopentyl)cyclohex-1-enyl)benzene (3.9 g).

Source