Toluene → 4'-(4-Cyclopropyl-2-ethoxy-5-formylimidazol-1-ylmethyl)-3'-fluoro-biphenyl-2-carboxylic acid t-butyl ester

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Reaction Steps

4′-(4-Bromo-2-ethoxy-5-formylimidazol-1-ylmethyl)-3′-fluorobiphenyl-2-carboxylic acid t-butyl ester (2.6 g, 5.24 mmol), cyclopropylboronic acid (900 mg, 10.5 mmol) 1.0 M tricyclohexylphosphine in toluene (524 μL, 524 μmol), potassium phosphate (3.9 g, 18.4 mmol), and palladium acetate (118 mg, 524 mmol) were combined and dissolved in toluene (95.0 mL, 892 mmol). The mixture was stirred at room temperature under nitrogen for 20 minutes. Water (5.1 mL, 183 mmol) and potassium carbonate (2.5 g, 18.4 mmol) were then added and the mixture heated at 100° C. for 3 hours. Water (100 mL) was added and the layers separated. The organics were washed with water (50 mL) and saturated aqueous NaCl (50 mL), dried over Na2SO4, and the solvent evaporated. The product was purified by flash chromatography (0-40% EtOAc in hexanes to yield compound A (1.2 g).

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