Reacción #2175431

Ecuación de reacción

ammonia

Lithium aluminum hydride

1-(4′-Ethoxy-2,2′,3,3′-tetrafluoro-1,1′-biphenyl-4-yl)-cyclohexan-4-one

ethyl acetate

→

trans-4-(4′-ethoxy-2,2′,3,3′-tetrafluoro-1,1′-biphenyl-4-yl)-cyclohexanol

Disolventes

THF

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwas added dropwide to the suspension in the temperature range of −20° C. to −10° C.
2. 2
   Temperaturacooling
3. 3
   Otrodeposits were removed by filtration through Celite
4. 4
   ExtracciónThe filtrate was extracted with ethyl acetate
5. 5
   LavadoThe combined organic phase was washed successively with water and brine
6. 6
   Secadodried over anhydrous magnesium sulfate
7. 7
   workup.DISTILLATIONThe solvent was distilled off under reduced pressure
8. 8
   Otrothe residue was purified by recrystallization from heptane

Procedimiento

Lithium aluminum hydride (0.31 g) was suspended in THF (100 ml). 1-(4′-Ethoxy-2,2′,3,3′-tetrafluoro-1,1′-biphenyl-4-yl)-cyclohexan-4-one (s-27) (5.0 g) dissolved in THF (20 ml) was added dropwide to the suspension in the temperature range of −20° C. to −10° C., and the stirring was continued in this temperature range for another 2 hours. After the completion of the reaction had been confirmed by means of GC analysis, ethyl acetate and then a saturated aqueous solution of ammonia were added to the reaction mixture under ice-cooling and deposits were removed by filtration through Celite. The filtrate was extracted with ethyl acetate. The combined organic phase was washed successively with water and brine, and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by recrystallization from heptane to give trans-4-(4′-ethoxy-2,2′,3,3′-tetrafluoro-1,1′-biphenyl-4-yl)-cyclohexanol (s-28) (12.1 g). The yield based on the compound (s-27) was 89.1%.

Fuente