Hydrochloric Acid → ethyl 3-[({4-[(1-{5-chloro-1-[3-(trifluoromethyl)phenyl]-1H-indol-2-yl}heptyl)amino]phenyl}carbonyl)amino]propanoate

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To a mixture of 4-[(1-{5-chloro-1-[3-(trifluoromethyl)phenyl]-1H-indol-2-yl}heptyl)amino]benzoic acid (250 mg) synthesized above, β-alanine ethyl ester hydrochloride (109 mg), 1-hydroxybenzotriazole monohydrate (109 mg), triethylamine (198 μL) and N,N-dimethylformamide (10 mL) was added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (136 mg), and the mixture was stirred at room temperature for 3 days. 1N Hydrochloric acid was added to quench the reaction, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (50% ethyl acetate/hexane) to give the title object compound (272 mg, 92%) as a pale-yellow oil.

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