[NH2:1][C:2]1[CH:3]=[C:4]([OH:8])[CH:5]=[CH:6][CH:7]=1.[C:9](Cl)(=[O:13])[CH:10]([CH3:12])[CH3:11]>C(#N)C>[OH:8][C:4]1[CH:3]=[C:2]([NH:1][C:9](=[O:13])[CH:10]([CH3:12])[CH3:11])[CH:7]=[CH:6][CH:5]=13-Aminophenol (1.0 g) was dissolved in acetonitrile (10 ml), the solution was added with isobutyryl chloride (488 mg) under ice cooling, and the mixture was stirred for 1 hour. The reaction mixture was filtered, then the filtrate was concentrated under reduced pressure, and the resulting residue was crystallized from hexane-ethyl acetate to obtain the title compound (392 mg).
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