Ethanol → HCID 23505941, compound

Participants

Reaction Steps

To a solution of 3bromo-4-trifluoromethoxybenzaldehyde (10.0 g, 37.2 mmol), (3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl) boronic acid (11 g, 44.68 mmol, 1.2 eq) in a mixture of toluene (100 mL), ethanol (20 mL) and water (15 mL) was added potassium carbonate (10.28 g, 74.4 mmol, 2 eq). The solution was degassed with argon for 40 minutes. Tetrakis(triphenylphosphine)palladium(0) (0.86 g, 0.74 mmol, 0.02 eq) was added and the mixture heated at reflux under argon for 22 hours. The solution was cooled to room temperature, diluted with ethyl acetate and washed successively with water and brine, dried over. MgSO4, filtered and evaporated. The residue was chromatographed on silica gel (silica: 70-230 mesh, 60A, 400 g, eluant: ethyl acetate/hexane, 5:95) to give 4-trifluoromethoxy-3-(3,5,5,8,7-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl) benzaldehyde (11.1 g, 76%). 1H NMR (300 MHz; CDCl3): 1.25 (s, 6H); 1.32 (s, 6H); 1.70.(s, 4H); 2.08 (s, 3H); 7.06 (s, 1H); 7.18 (s, 1H); 7.48 (dd, J1=8.4 Hz, J2=1.5 Hz, 1H); 7.84 (d, J=2.0 Hz, 1H); 7.88 (dd, J1=2.0 Hz, J2=8.5 Hz 1H), 9.91 (s, 1H).

Provenance & Evidence