Cyclohexane → (4-Bromo-2-trifluoromethoxy-phenyl)-acetaldehyde

Participants

Reaction Steps

To a suspension of (methoxymethyl) triphenylphosphonium chloride (5.29 g, 14.9 mol) in Et2O (50 mL) was added 1.8 M phenyl lithium in 30% Et2O in cyclohexane (8.58 mL, 15.5 mmol). The mixture was stirred at ambient temperature for 10 min. To the reaction mixture was added 4-bromo-2-trifluoromethoxy-benzaldehyde (4 g, 14.9 mmol) in Et2O (18 mL). The mixture was stirred at ambient temperature for 4 hr, filtrated, and concentrated. To the above residue was added 10% H2SO4 in AcOH (40 mL). The mixture was stirred at ambient temperature for 90 min. The solution was poured into H2O, and the aqueous layer was extracted with CHCl3 (three times). The combined organic layer was washed with saturated aqueous NaHCO3, washed with brine, dried over MgSO4, filtered, concentrated, and purified by flash chromatography (silica gel, 9% EtOAc in hexane) to give (4-bromo-2-trifluoromethoxy-phenyl)-acetaldehyde (1.25 g, 30%) as a pale brown oil.

Provenance & Evidence