Acetic Acid → 2-(2-Thioxo-2,3-dihydro-benzooxazol-5-yl)-propionic acid

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Reaction Steps

To a stirred solution of 2-(2-Thioxo-2,3-dihydro-benzooxazol-5-yl)-propionic acid ethyl ester (124 mg) in 90% aq. EtOH was added NaOH (102 mg) at room temperature. After stirred for 20 h at 45, the reaction mixture was cooled to room temperature, diluted with water. The resulting aqueous layer was acidified with acetic acid and then extracted with dichloromethane. The combined organic layer was dried over magnesium sulfate, filtered and concentrated in vacuo. (105 mg, 95.4%)

Provenance & Evidence