Tetrahydrofuran → 4-{[Cyclohexyl(3-methylthieno[3,2-b]pyridin-2-yl)methyl]amino}benzoic acid

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Reaction Steps

To a mixture of methyl 4-{[cyclohexyl(3-methylthieno[3,2-b]pyridin-2-yl)methyl]amino}benzoate (1.31 g) synthesized above, tetrahydrofuran (10 mL) and ethanol (10 mL) was added 1N aqueous sodium hydroxide solution (10 mL), and the mixture was stirred overnight with heating under reflux. 1N Aqueous sodium hydroxide solution (5 mL) was additionally added, and the mixture was further stirred with heating under reflux for 7 hr, and concentrated under reduced pressure. The residue was dissolved in water (20 mL), and 1N hydrochloric acid (15 mL) was added at 0° C. The resulting precipitate was collected by filtration, and the obtained brown solid was dissolved in ethyl acetate. The solution was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was washed with diisopropyl ether to give the title object compound (804 mg, 64%) as a brown solid.

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