反応 #2175432

反応方程式

ammonia

Lithium aluminum hydride

4-(4′-Hexyloxy-2,3,-difluorophenyl)-cyclohexanone

ethyl acetate

→

trans-4-(4′-hexyloxy-2,3,-difluorophenyl)-cyclohexanol

収率 81.0%

溶媒

THF

THF

反応条件

後処理

1. 1
   workup.ADDITIONwas added dropwise to the suspension in the temperature range of −20° C. to −10° C.
2. 2
   温度cooling
3. 3
   その他deposits were removed by filtration through Celite
4. 4
   抽出The filtrate was extracted with ethyl acetate
5. 5
   洗浄The combined organic phase was washed successively with water and brine
6. 6
   乾燥dried over anhydrous magnesium sulfate
7. 7
   workup.DISTILLATIONThe solvent was distilled off under reduced pressure
8. 8
   その他the residue was purified by recrystallization from heptane

実験手順

Lithium aluminum hydride (1.47 g) was suspended in THF (200 ml). 4-(4′-Hexyloxy-2,3,-difluorophenyl)-cyclohexanone (s-14) (20.0 g) dissolved in THF (50 ml) was added dropwise 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′-hexyloxy-2,3,-difluorophenyl)-cyclohexanol (s-29) (16.3 g). The yield based on the compound (s-27) was 81.0%.

出典