3,5-difluoro-4-(trifluoromethoxy)phenol

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: (E)-4-(2-(trans-4-(trans-4-pentylcyclohexyl)cyclohexyl)vinyl)benzoic acid in an amount of 1,3 g (3.7 mmol), 0.8 g (3.7 mmol) of 3,5-difluoro-4-trifluoromethoxyphenol, 0.1 g (1.1 mmol) of DMAP, and 30 ml of dichloromethane were mixed. To this mixture was added dropwise 5 ml of solution of 1.0 g (4.8 mmol) of DCC in dichloromethane while being cooled with ice in 5 min, and stirred as it was for 12 hours. Separated crystals were filtered off, and 80 ml of toluene was added to the filtrate, washed with 2N-NaOH five times and with water thrice, and then dried over anhydrous magnesium sulfate. The solvent was distilled off under a reduced pressure. The residue thus obtained was subjected to silica gel column chromatography (eluent: toluene) to obtain 1.7 g of a crude (E)-3,5-difluoro-4-trifluoromethoxyphenyl 4-(2-(trans-4-(trans-4-propylcyclohexyl)cyclohexyl)vinyl)benzoate. while being cooled with ice in 5 min Separated crystals were filtered off 80 ml of toluene was added to the filtrate washed with 2N-NaOH five times and with water thrice dried over anhydrous magnesium sulfate The solvent was distilled off under a reduced pressure The residue thus obtained