Reaction Steps
To a solution of (S)-2-{4-[3-(2-hydroxy-2-methyl-propyl)-phenoxy]-2-oxo-2,5-dihydro-pyrrol-1-yl}-4-methyl-pentanoic acid (prepared as in Example 235, 0.159 g, 0.44 mmol) in N,N-dimethylformamide (5 mL) was added 1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-ylamine (prepared as in Example 49, 0.129 g, 0.65 mmol), N,N-diisopropylethylamine (0.312 g, 2.41 mmol) and benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.778 g, 1.76 mmol) at 0° C. The mixture was allowed to slowly warm up to room temperature and stirred for 48 h. The solvents were then concentrated in vacuo. The residue was dissolved in ethyl acetate and the mixture formed was washed with aqueous saturated ammonium chloride and brine, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was initially purified by flash column chromatography (silica gel 10% to 100% ethyl acetate/hexanes). Then followed by reverse phase HPLC (C18, 20×150 mm column and 45-100% water/acetonitrile gradient at a flow rate of 30 mL/min) to afford (S)-2-{4-[3-(2-hydroxy-2-methyl-propyl)-phenoxy]-2-oxo-2,5-dihydro-pyrrol-1-yl}-4-methyl-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrazol-3-yl]-amide (0.181 g, 76%) as a white solid: HR-ES-MS m/z calculated for C29H40N4O6 [M+H]+ 541.3021, observed 541.3017; 1H NMR (300 MHz, DMSO-d6) δ ppm 0.89 (d, J=6.3 Hz, 3H), 0.93 (d, J=6.3 Hz, 3H), 1.05 (s, 6H), 1.24 (s, 3H), 1.29 (s, 3H), 1.36-1.64 (m, 2H), 1.63-1.80 (m, 1H), 2.67 (s, 2H), 3.73 (dd, J=8.4, 5.9 Hz, 1H), 4.00 (dd, J=8.4, 6.3 Hz, 1H), 4.03-4.14 (m, 2H), 4.17 (d, J=18.4 Hz, 1H), 4.28-4.37 (m, 1H), 4.36 (s, 1H), 4.55 (d, J=18.4 Hz, 1H), 4.82 (s, 1H), 4.87 (dd, J=10.7, 4.7 Hz, 1H), 6.43 (d, J=2.1 Hz, 1H), 7.03-7.17 (m, 3H), 7.24-7.41 (m, 1H), 7.59 (d, J=2.1 Hz, 1H), 10.77 (s, 1H).
