To a solution of (3R)-3-(cyclopentylmethyl)-4-oxo-4-{5-[(2-pyrimidinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoic acid (183 mg, 0.49 mmol) in dichloromethane (DCM) (10 mL) was added N-methylmorpholine (0.14 mL, 1.27 mmol), O-(tetrahydro-2H-pyran-2-yl)hydroxylamine (69 mg, 0.59 mmol), EDC (112 mg, 0.59 mmol) and 3H-[1,2,3]triazolo[4,5-b]pyridin-3-ol (67 mg, 0.49 mmol) at 0° C. The reaction mixture was allowed to warm to room temperature and was stirred for 2 hours. The reaction mixture was then washed with water (5 mL) and NaHCO3 solution (5 mL×3), and concentrated to provide the crude product as a mixture of diastereomers. This mixture was purified by Gilson HPLC (Sunfire Column 19×50 mm, flowrate 25 mL/min, 10 min, 5-70% MeCN:H2O) to afford (5S)-1-{(2R)-2-(cyclopentylmethyl)-4-oxo-4-[(tetrahydro-2H-pyran-2-yloxy)amino]butanoyl}-N-2-pyrimidinyl-4,5-dihydro-1H-pyrazole-5-carboxamide (80 mg, 34% yield). MS: 473 ([M+H]+).
