Methyl 3-[(dipropylamino)carbonyl]-5-(4-methyl-1,3-oxazol-2-yl)benzoate → 3-[(Dipropylamino)carbonyl]-5-(4-methyl-1,3-oxazol-2-yl)benzoic acid

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Reaction Steps

A solution of methyl 3-[(dipropylamino)carbonyl]-5-(4-methyl-1,3-oxazol-2-yl)benzoate (118 mg, 0.34 mmol) in methanol (1 mL) and potassium hydroxide (1 mL of a 1.0 M solution in water, 1 mmol) was stirred at room temperature for 45 min. The solvent was removed under reduced pressure, the residue was dissolved in water, extracted with ethyl acetate, the aqueous layer was acidified to pH 4 with 1 N hydrochloric acid, extracted with chloroform (3×100 mL), and the combined organics were concentrated under reduced pressure to afford 3-[(dipropylamino)carbonyl]-5-(4-methyl-1,3-oxazol-2-yl)benzoic acid (110 mg): 1H NMR (300 MHz, CD3OD) δ 8.66 (d, J=1 Hz, 1H), 8.17 (d, J=1 Hz, 1H), 8.07 (d, J=1 Hz, 1H), 7.75 (d, J=1 Hz, 1H), 3.51 (t, J=7 Hz, 2H), 3.25 (t, J=7 Hz, 2H), 2.23 (s, 3H), 1.74 (d, J=7 Hz, 2H), 1.60 (d, J=7 Hz, 2H), 1.01 (t, J=7 Hz, 3H), 0.76 (t, J=7 Hz, 3H).

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