[OH:1][C:2]1[CH:7]=[C:6]([N+:8]([O-:10])=[O:9])[CH:5]=[CH:4][C:3]=1[NH:11][C:12](=[O:14])[CH3:13].C(=O)([O-])[O-].[K+].[K+].CN(C)C=O.[CH3:26][O:27][CH2:28][CH2:29]Br>COCCBr.O>[CH3:26][O:27][CH2:28][CH2:29][O:1][C:2]1[CH:7]=[C:6]([N+:8]([O-:10])=[O:9])[CH:5]=[CH:4][C:3]=1[NH:11][C:12](=[O:14])[CH3:13]
The mixture of N-(2-hydroxy-4-nitrophenyl)acetamide (93 g, 0.47 mol, 1.00 equiv), potassium carbonate (184 g, 1.33 mol, 2.81 equiv) and dimethylformamide (465 ml) was stirred at 60° C. as 2-bromoethyl methyl ether (90 g, 0.647 mol, 1.36 equiv) was added over 15 minutes. After 1 hour, additional 2-bromoethyl methyl ether (4 g, 0.028 mol, 0.059 equiv) was added and the mixture was stirred at 60° C. for another hour. The mixture was cooled to room temperature and poured into 1 L of water. After 30 minutes, the product was formed and collected by filtration and washed with water and heptane. The product was dried in a vacuum oven at 60° C. to give the title compound 97 g. MS (ESI) m/z: 255 (M+1).
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