反应详情

A solution of (S)-4-methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrazol-3-yl]-amide (0.025 g, 0.05 mmol) in tetrahydrofuran (5 mL) was treated with 1M aqueous hydrochloric acid (1 mL) and the resulting mixture was stirred at room temperature overnight. The mixture was partioned between ethyl acetate and water. The aqueous phase was made basic with 1N aqueous sodium hydroxide and extracted with ethyl acetate twice. The combined organic phase was concentrated in vacuo and the residue purified by flash column chromatography (silica gel, 0% to 40% tetrahydrofuran/ethyl acetate) which afforded (S)-4-methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid [1-((R)-2,3-dihydroxy-propyl)-1H-pyrazol-3-yl]-amide (0.013 g, 56%) as a white solid: HR-ES-MS m/z calculated for C24H30N6O5 [M+H]+ 483.2351, observed 483.235; 1H NMR (300 MHz, CDCl3) δ ppm 0.97 (d, J=6.6 Hz, 3H), 1.00 (d, J=6.6 Hz, 3H), 1.59 (br. s., 1H), 1.69-1.97 (m, 2H), 2.72 (br. s., 2H), 3.56 (dd, J=11.8, 4.8 Hz, 1H), 3.68 (dd, J=11.8, 3.3 Hz, 1H), 4.06-4.16 (m, 5H), 4.20 (d, J=18.4 Hz, 1H), 4.48 (d, J=18.4 Hz, 1H), 4.88 (t, J=7.8 Hz, 1H), 5.03 (s, 1H), 6.66 (d, J=2.1 Hz, 1H), 6.94 (d, J=7.2 Hz, 1H), 7.29-7.43 (m, 4H), 7.96 (s, 1H), 9.39 (br. s., 1H).

1. extractionextracted with ethyl acetate twice
2. concentrationThe combined organic phase was concentrated in vacuo
3. customthe residue purified by flash column chromatography (silica gel, 0% to 40% tetrahydrofuran/ethyl acetate) which