Reaction Steps
To a solution of (S)-2-[4-(2-bromo-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (0.260 g, 0.71 mmol) in N,N-dimethylformamide (10 mL) was added 1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-ylamine (prepared as in Example 49, 0.180 g, 0.91 mmol) and benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.663 g, 1.50 mmol). The mixture was stirred at 0° C. and N,N-diisopropylethylamine (0.200 g, 1.55 mmol) was added. The mixture was stirred at room temperature for 5 h and the solvents were evaporated. The residue was treated with ethyl acetate and ammonium chloride solution, and the organic layer separated. The organic layer was washed with brine and dried over sodium sulfate. The solvents were evaporated and the residue was purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 12 g, 20% to 100% ethyl acetate/hexanes) which afforded (S)-2-[4-(2-bromo-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-amide (0.290 g, 75%) as a yellow solid: HR-ES-MS m/z calculated for C25H31BrN4O5 [M+H]+ 547.1551, observed 547.1549, 1H NMR (300 MHz, DMSO-d6) δ ppm 1.00 0.90 (d, J=6.4 Hz, 3 H), 0.94 (d, J=6.4 Hz, 3H), 1.25 (s, 3H), 1.30 (s, 3H), 1.37-1.50 (m, 1H), 1.50-1.65 (m, 1H), 1.69-1.83 (m, 1H), 3.73 (dd, J=8.4, 5.8 Hz, 1H), 4.00 (dd, J=8.4, 6.5 Hz, 1H), 4.11 (t, J=5.8 Hz, 2H), 4.20 (d, J=18.4 Hz, 1H), 4.35 (quin, J=5.8 Hz, 1H), 4.61 (d, J=18.4 Hz, 1H), 4.77 (s, 1H), 4.90 (dd, J=10.6, 4.8 Hz, 1H), 6.44 (d, J=2.1 Hz, 1H), 7.24-7.35 (m, 1H), 7.50 (m, 2H), 7.60 (d, J=2.1 Hz, 1H), 7.79 (d, J=7.8 Hz, 1H), 10.82 (s, 1H).
