A solution of methyl 6-chloro-5-{4-[3-(morpholin-4-yl)propoxy]phenyl}-1H-indole-3-carboxylate (24 mg, 0.056 mmol) in methanol (0.5 mL) and 1 M sodium hydroxide (0.17 mL, 0.17 mmol) was heated at 75° C. for 24 hours. The reaction was acidified with 1 M HCl to pH=2 then diluted with ethyl acetate. The layers were separated and the aqueous layer was back-extracted twice with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified using reverse-phase chromatography to give the title compound as the formic acid salt. MS (ES+) 415.129 (M+H)+ Retention time: 2.2 min; Waters Atlantis dC18 5 μm 4.6×50 mm, 95% H2O/5% MeCN linear to 5% H2O/95% MeCN over 4.0 min, HOLD at 5% H2O/95% MeCN to 5.0 min. (0.05% TFA) Flow: 2.0 mL/min.
