反应详情

Sodium hydroxide (24 mg) was added to a solution of ethyl 3-[5-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-1H-indol-2-yl]propanoate (D115) (54 mg) in THF (1 mL), isopropanol (1 mL) and water (0.5 mL). The reaction mixture was stirred at room temperature until LCMS showed no starting material. The mixture was neutralized with 2 M HCl till pH ˜6.0. The crude product 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)-1H-indol-2-yl]propanoic acid (E90) (19 mg). δH (DMSO-d6, 400 MHz): 1.39 (6H, d), 2.70 (2H, t), 2.99 (2H, t), 5.46 (1H, m), 6.34 (1H, s), 7.45 (1H, d), 7.76 (1H, dd), 8.22 (1H, s), 8.55 (1H, d), 8.93 (1H, d), 11.35 (1H, s), 12.26 (1H, s); MS (ES): C21H19ClN4O4 requires 426; found 427.1 (M+H+).

1. customThe crude product was purified by Mass Directed Auto Prep