Ethanol → (2R,4R)-5-(3'-Chlorobiphenyl-4-yl)-2-hydroxy-4-[(5-oxo-1-phenyl-4,5-dihydro-1H-[1,2,4]triazole-3-carbonyl)amino]pentanoic Acid

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Reaction Steps

5-Oxo-1-phenyl-4,5-dihydro-1H-[1,2,4]triazole-3-carboxylic acid (42.3 mg, 206 μmol) and HCTU (128 mg, 310 μmol) were combined in DMF, and stirred for 10 minutes at room temperature. DIPEA (72 μL, 413 μmol) and (2R,4R)-4-amino-5-(3′-chlorobiphenyl-4-yl)-2-hydroxypentanoic acid ethyl ester (50 mg, 0.1 mmol) were added, and the resulting mixture was stirred at room temperature overnight. The mixture was combined with EtOH (402 μL, 6.9 mmol) and 1 M LiOH in water (1.1 mL, 1.1 mmol). The mixture was stirred at room temperature for 1 hour, evaporated under reduced pressure, and purified by preparative HPLC to yield the title compound (1.8 mg) as a TFA salt. MS m/z [M+H]+ calc'd for C26H23ClN4O5, 507.14. found 507.2.

Provenance & Evidence