Potassium Carbonate → 4-Methoxy-2-fluoro-3-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)benzaldehyde

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A mixture of 2-fluoro-4-methoxy-3-trifluoromethanesulfonyl benzaldehyde (1.21 g, 4.01 mmol), (3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl) boronic acid (1.08 g, 4.41 mmol) and potassium carbonate (2.22 g, 16.04 mmol) in 1,2-dimethoxyethane (30 mL) and water (2 mL) was degassed with argon for 30 minutes. Tetrakis(triphenylphosphine)palladium(0) (0.23 g, 0.2 mmol) was added and the mixture heated at reflux under argon for 16 hours. The solution was cooled to room temperature, diluted with ethyl acetate and washed successively with water and brine, dried over anhydrous magnesium sulfate, filtered and evaporated. The residue was chromatographed on silica gel (Biotage, eluent: ethyl acetate/hexane, 0.5:8.5) to give 0.87 g of 4-methoxy-2-fluoro-3-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl) benzaldehyde (62%). 1H NMR (500 MHz; CDCl3): δ 1.26 (s, 6 H), 1.32 (s, 6 H), 1.69 (s, 4 H), 2.07 (s, 3 H), 3.85 (s, 3 H), 7.07 (d, J=8.8 Hz, 1 H), 7.07 (s, 1 H), 7.19 (s, 1 H), 7.90 (t, J=8.8 Hz, 1 H), 10.25 (s, 1 H).

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