反应详情

A solution of (S)-2-[4-(3-ethoxy-2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid [5-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-pyrazin-2-yl]-amide (prepared in Example 152, 0.251 g, 0.46 mmol) in tetrahydrofuran (25 mL) was treated with 1N aqueous hydrochloric acid (10 mL). The reaction mixture was stirred for 20 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 flash chromatography (Teledyne Isco RediSep Flash Column 12 g; 10% to 100% (9:1 dichloromethane:methanol)/hexanes) to afford (S)-2-[4-(3-ethoxy-2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid [5-((S)-1,2-dihydroxy-ethyl)-pyrazin-2-yl]-amide (0.210 g, 90%) as a fluffy white solid: HR-ES-MS m/z calculated for C24H28F2N4O6, [M+H]+ 507.2050 observed 507.2051; 1H NMR (300 MHz, DMSO-d6) δ ppm 0.92 (d, J=6.9 Hz, 3H), 0.95 (d, J=6.9 Hz, 3H), 1.35 (t, J=6.9 Hz, 3H), 1.40-1.56 (m, 1H), 1.56-1.73 (m, 1H), 1.75-1.93 (m, 1H), 3.42-3.62 (m, 1H), 3.61-3.74 (m, 1H), 4.13 (q, J=6.9 Hz, 2H), 4.31 (d, J=18.7 Hz, 1H), 4.51-4.69 (m, 2H), 4.73 (t, J=5.7 Hz, 1H). 5.02 (dd, J=10.6, 4.2 Hz, 1H), 5.08 (s, 1H), 5.55 (d, J=5.1 Hz, 1H), 7.12-7.23 (m, 1H), 7.23-7.33 (m, 1H), 8.45 (s, 1H), 9.17 (s, 1H), 11.16 (s, 1H).

1. washwashed with saturated sodium bicarbonate
2. dry with materiala saturated sodium chloride solution and dried over magnesium sulfate
3. filtrationThe mixture was filtered
4. customevaporated
5. customthe residue purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 12 g; 10% to 100% (9:1 dichloromethane:methanol)/hexanes)