Tetrahydrofuran → 3-{[(4-{[(5-Chloro-3-methylfuro[3,2-b]pyridin-2-yl)(cyclohexyl)methyl]amino}phenyl)carbonyl]amino}propanoic acid

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To a mixture of ethyl 3-{[(4-{[(5-chloro-3-methylfuro[3,2-b]pyridin-2-yl)(cyclohexyl)methyl]amino}phenyl)carbonyl]amino}propanoate (383 mg) synthesized above, tetrahydrofuran (5 mL) and ethanol (5 mL) was added 1N aqueous sodium hydroxide solution (2.00 mL), and the mixture was stirred at room temperature for 2 hr, and concentrated under reduced pressure. The residue was dissolved in water (10 mL), and 1N hydrochloric acid (2.00 mL) was added at 0° C. The resulting precipitate was collected by filtration to give the title object compound (328 mg, 93%) as a white solid.

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