A solution of (S)-2-[4-(2-chloro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (200 mg, 0.57 mmol) in dichloromethane (10 mL) was treated with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (96 mg, 0.62 mmol) and 1-hydroxybenzotriazole (80 mg, 0.60 mmol). The reaction mixture was stirred at 25° C. for 2 h followed by the addition of 1-(3-amino-pyrazol-1-yl)-2-methyl-propan-2-ol (prepared in U.S. Pat. Appl. US2008021032 Example 80, 105 mg, 0.68 mmol). The reaction mixture was stirred for 18 h at 25° C., under nitrogen. The reaction mixture was diluted with dichloromethane, washed with 2N aqueous hydrochloric acid, saturated sodium bicarbonate solution, a saturated sodium chloride solution and dried over magnesium sulfate. The organic layer was concentrated, and the crude product was purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 12 g; 0% to 100% ethyl acetate/hexanes) to afford (S)-2-[4-(2-Chloro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid [1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-amide (198 mg, 71%) as an off-white solid: LR-ES-MS m/z calculated for C24H31ClN4O5 [M]− 490, observed [M+H]+ 491; 1H NMR (300 MHz, DMSO-d6) δ ppm 0.90 (d, J=6.6 Hz, 3H), 0.93 (d, J=6.6 Hz, 3H), 1.05 (s, 3H), 1.06 (s, 3H), 1.43 (br. s., 1H), 1.48-1.65 (m, 1H), 1.68-1.84 (m, 1H), 3.89 (br. s., 2H), 3.90 (s, 3H), 4.19 (d, J=18.6 Hz, 1H), 4.60 (d, J=18.6 Hz, 1H), 4.68 (s, 1H), 4.80 (s, 1H), 4.89 (dd, J=10.9, 4.8 Hz, 1H), 6.44 (d, J=2.1 Hz, 1H), 7.09 (dd, J=8.5, 1.3 Hz, 1H), 7.13 (dd, J=8.5, 1.3 Hz, 1H), 7.41 (t, J=8.5 Hz, 1H), 7.54 (d, J=2.1 Hz, 1H), 10.81 (s, 1H).
