Potassium Carbonate → 1-(propan-2-yl)-4-(2,3,4-trifluorophenyl)-1H-indole-3-carboxaldehyde

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To a solution of 4-bromo-1-(propan-2-yl)-1H-indole-3-carboxaldehyde (100 mg, 0.376 mmol) and 2,3,4-trifluorophenylboronic acid (79 mg, 0.451 mmol) in dioxane (2 mL) and water (0.5 mL) in a 5 mL microwave reaction vial was added potassium carbonate (156 mg, 1.13 mmol) and dichloro[1,1′-bis(di-t-butylphosphino)ferrocene]palladium (II) (25 mg, 0.038 mmol). The reaction was placed under nitrogen, sealed and heated in a microwave reactor at 140° C. for 15 minutes. The solvent was removed in vacuo and the residue was partitioned with ethyl acetate and aqueous sodium bicarbonate and extracted twice with ethyl acetate. The organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated. The residue was purified on silica gel (COMBI FLASH 24 gm column, gradient of 0-100% ethyl acetate/hexanes) to give the title intermediate (82 mg).

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