Dichloromethane → (R)-3-{N-(5'-Chloro-2'-fluorobiphenyl-4-ylmethyl)-N'-[3-(2-fluorophenyl)isoxazole-5-carbonyl]hydrazino}-2-hydroxypropionic acid 2,2,3,3,3-pentafluoropropyl Ester

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A mixture of (R)-3-{N-(5′-chloro-2′-fluorobiphenyl-4-ylmethyl)-N′-[3-(2-fluorophenyl)isoxazole-5-carbonyl]hydrazino}-2-hydroxypropionic acid (30.0 mg, 57 μmol), EDC HCl (65.4 mg, 341 μmol), and HOBt hydrate (52.2 mg, 341 μmol) in DCM (0.5 mL, 8 mmol) was stirred at room temperature for 10 minutes. 2,2,3,3,3-Pentafluoro-1-propanol (45.3 μL, 455 μmol) was added and the resulting mixture was stirred at room temperature for 1 hour then concentrated. The residue was dissolved in AcOH (2 mL), filtered, and purified by reverse phase prep HPLC to yield the title compound (4.8 mg, purity 90.2%) as a TFA salt. MS m/z [M+H]+ calc'd for C29H21ClF7N3O5, 660.11. found 660.3.

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