Reaction Steps
A solution of (S)-2-[4-(2,6-difluoro-3-methoxy-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 (prepared in Example 118, 0.163 g, 0.30 mmol) in tetrahydrofuran (15 mL) was treated with 2N aqueous hydrochloric acid (7.5 mL). The reaction mixture was stirred for 3.5 h at room temperature. The reaction mixture was diluted with ethyl acetate, washed with saturated sodium bicarbonate, a saturated sodium chloride solution and dried over magnesium sulfate. The mixture was filtered and evaporated and the residue purified by ISCO column chromatography (Teledyne Isco RediSep Flash Column 12 g, 30% to 100%, (9:1 dichloromethane:methanol)/hexanes) which afforded (S)-2-[4-(2,6-difluoro-3-methoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid [1-((R)-2,3-dihydroxy-propyl)-1H-pyrazol-3-yl]-amide (0.135 g, 90%) as an off-white solid: HR-ES-MS m/z calculated for C23H28F2N4O6, [M+H]+ 495.205 observed 495.205; 1H NMR (300 MHz, DMSO-d6) δ ppm 0.90 (d, J=6.4 Hz, 3H), 0.93 (d, J=6.4 Hz, 3H), 1.43 (br. s., 1H), 1.49-1.67 (m, 1H), 1.67-1.87 (m, 1H), 3.18-3.32 (m, 2H), 3.69-3.86 (m, 2H), 3.87 (s, 3H), 4.09 (dd, J=13.6, 2.7 Hz, 1H), 4.27 (d, J=18.7 Hz, 1H), 4.63 (d, J=18.7 Hz, 1H), 4.71 (t, J=4.8 Hz, 1H), 4.81-4.91 (m, 1H), 4.94 (d, J=4.8 Hz, 1H), 5.06 (s, 1H), 6.40 (br. s., 1H), 7.09-7.24 (m, 1H), 7.24-7.38 (m, 1H), 7.53 (br. s., 1H), 10.79 (br. s., 1H).
