Hydrochloric Acid → HCID 59529431, compound

Participants

Reaction Steps

To a mixture of 4-[(cyclohexyl{2-methyl-5-[4-(trifluoromethyl)phenyl]thiophen-3-yl}methyl)amino]benzoic acid (300 mg) synthesized in Example 280-(4), ethyl β-alaninate hydrochloride (117 mg), 1-hydroxybenzotriazole monohydrate (117 mg) and triethylamine (106 μL) in N,N-dimethylformamide (10 mL) was added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (146 mg), and the mixture was stirred at room temperature for 5 hr. 1N Hydrochloric acid was added to quench the reaction, and the mixture was extracted with ethyl acetate. The extract was washed with 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 colorless oil. To a mixture of the obtained oil, tetrahydrofuran (5 mL) and ethanol (5 mL) was added 1N aqueous sodium hydroxide solution (1 mL), and the mixture was stirred at room temperature for 5 hr, and concentrated under reduced pressure. The residue was dissolved in water (10 mL), and 1N hydrochloric acid (1 mL) was added at 0° C. The resulting precipitate was collected by filtration to give the title compound (212 mg, 61%) as a white solid.

Provenance & Evidence