[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][C:3]=1[OH:9].C(=O)(O)[O-].[Na+].[C:15](Cl)(=[O:22])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1>CCOC(C)=O.O>[Cl:8][C:5]1[CH:6]=[CH:7][C:2]([NH:1][C:15](=[O:22])[C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)=[C:3]([OH:9])[CH:4]=12-Amino-5-chlorophenol (1.45 g, 10 mmol) was dissolved in EtOAc (30 ml) and water (20 ml). Sodium bicarbonate (1.25 g, 15 mmol) then benzoyl chloride (1.42 g, 10 mmol) were added and the mixture was stirred at room temperature for 1 h. The layers were partitioned and the organic layer was washed with brine, dried and concentrated in vacuo. The residue was triturated with di-ethyl ether to yield the title compound (2.05 g, 82%).
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