Acetohydroxamic Acid → (3-Amino-benzo[d]isoxazol-5-yl)-acetic acid ethyl ester

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To a solution of (3-cyano-4-fluoro-phenyl)-acetic acid ethyl ester (Preparation 127, 400 mg, 1.93 mmol) and acetohydroxamic acid (362 mg, 4.83 mmol) in DMF (40 mL) and water (15 mL) was added potassium carbonate (1.6 g, 11.58 mmol) and the reaction mixture stirred at room temperature for 12 hours. The reaction mixture was diluted with water (100 mL) and the resulting white precipitate and collected by filtration. The crude material was purified by silica gel column chromatography eluting with a gradient of dichloromethane:methanol 100:0 to 97:3 to afford the title compound as an off-white solid in 59% yield, 250 mg.

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