Tetrahydrofuran → 1-{[6-(2-Methylcarbamoyl-pyridin-4-yloxy)-benzooxazol-2-ylamino]-methyl}-cyclohexanecarboxylic acid

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Reaction Steps

1-{[6-(2-Methylcarbamoyl-pyridin-4-yloxy)-benzooxazol-2-ylamino]methyl}-cyclohexanecarboxylic acid ethyl ester (1 eq) was dissolved in 3 M sodium hydroxide (20 eq); THF and methanol were added to homogenize the solution. The mixture was allowed to react at room temperature overnight. The solvents were removed. The crude product was brought to a pH of 4 with 1 N HCl, then to pH of 7 with saturated aqueous sodium bicarbonate. This solution was saturated with solid sodium chloride then extracted three times with ethyl acetate. The combined organic extracts were washed once with brine, dried with anhydrous sodium sulfate, filtered and concentrated. The product was purified by silica gel column in isopropanol and dichloromethane (50%) MH+=425.1.

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