Potassium Phosphate, Tribasic → (S)-2-[4-(3-cyclopropyl-2-fluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid ethyl ester

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To a mixture of (S)-2-[4-(3-bromo-2-fluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid ethyl ester (prepared as in Example 128, 1.2 g, 2.9 mmol), palladium(II) acetate (0.035 g, 0.15 mmol), tricyclohexylphosphine (0.084 g, 0.30 mmol), and tripotassium phosphate (2.0 g, 9.0 mmol) in toluene (8 mL) was added cyclopropylboronic acid (0.325 g, 3.8 mmol) and water (0.2 mL) and the resulting mixture was sparged with nitrogen and transferred to an Emry Optimizer microwave reaction vessel and heated at 130° C., for 2.5 h. The mixture was taken up in ethyl acetate and dilute hydrochloric acid and separated. The organic phase was washed with a saturated sodium bicarbonate solution, a saturated sodium chloride solution and dried over sodium sulfate. The mixture was filtered and evaporated and the residue purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 80 g, 0% to 50% ethyl acetate/hexanes) which afforded (S)-2-[4-(3-cyclopropyl-2-fluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid ethyl ester (0.80 g, 74%) as a pale yellow solid.

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