反应详情

Sodium hydroxide (63 mg) was added to a solution of methyl 3-[5-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-1-methyl-1H-indol-2-yl]propanoate (D116) (72 mg) in THF (5 mL), isopropanol (5 mL) and water (2.5 mL). The reaction mixture was stirred at room temperature overnight. The mixture was neutralized with 2 M HCl till pH ˜6.0. The solvent was concentrated, and the residue was dissolved in water. The precipitated solid was purified by Mass Directed Auto Prep to afford 3-[5-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-1-methyl-1H-indol-2-yl]propanoic acid (E91) (12 mg). δH (DMSO-d6, 400 MHz): 1.39 (6H, d), 2.71 (2H, t), 3.03 (2H, t), 3.75 (3H, s), 5.46 (1H, m), 6.40 (1H, s), 7.60 (1H, d), 7.82 (1H, dd), 8.24 (1H, d), 8.56 (1H, d), 8.93 (1H, d), 12.33 (1H, s); MS (ES): C22H21ClN4O4 requires 440; found 441.1 (M+H+).

1. concentrationThe solvent was concentrated
2. dissolutionthe residue was dissolved in water
3. customThe precipitated solid was purified by Mass Directed Auto Prep