Diisopropylethylamine → (1R,2R)-2-{4'-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-biphenyl-4-carbonyl}-cyclopentanecarboxylic acid

Participants

Reaction Steps

To a solution of 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (0.25 g, 1 mmol) and bromo-tris-pyrrolidino-phosphonium hexafluorophosphate (0.47 g, 1 mmol) in methylene chloride was added racemic trans-2-(4′-amino-biphenyl-4-carbonyl)-cyclopentanecarboxylic acid (0.20 g, 0.78 mmol) and diisopropylethylamine (0.35 mL, 2 mmol). The mixture was stirred at ambient temperature for 3 h. The reaction mixture was concentrated and the residue was re-dissolved in DMSO and acetonitrile. HPLC reverse phase purification with acetonitrile and water afforded 44 mg of racemic trans-2-{4′-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-biphenyl-4-carbonyl}-cyclopentanecarboxylic acid as a white solid. LCMS calcd for C30H23F3N2O5 (m/e) 548, obsd 549 (M+H).

Provenance & Evidence