Acetone → (2R,4R)-5-(5'-Chloro-2'-fluorobiphenyl-4-yl)-2-hydroxy-4-{[1-((S)-2-methoxycarbonylamino-3-methylbutyryloxymethoxy)-1H-[1,2,3]triazole-4-carbonyl]amino}pentanoic Acid

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(S)-2-Methoxycarbonylamino-3-methylbutyric acid chloromethyl ester (37.4 mg, 167 μmol) was added to a solution of (2R,4R)-5-(5′-chloro-2′-fluorobiphenyl-4-yl)-2-hydroxy-4-[(1-hydroxy-1H-1,2,3-triazole-4-carbonyl)amino]pentanoic acid (30.0 mg, 66.8 mol) in acetone (0.5 mL, 6.8 mmol). Et3N (18.6 μL, 134 μmol) was added and the resulting mixture was stirred at 65° C. for 2 hours. The mixture was then concentrated in vacuo to yield a yellow liquid. The crude liquid was purified (preparative scale C18 column chromatography, small column, using 30-90% MeCN in water with 0.05% TFA) to yield the title compound as a white solid (8.2 mg). MS m/z [M+H]+ calc'd for C28H31ClFN5O9, 636.18. found 636.1.

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