Ethyl Acetate → 2-(Bromomethyl)-3-(2-chlorophenyl)-5-nitroquinoxaline

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To a solution of 3-bromo-1-(2-chlorophenyl)propane-1,2-dione (Prepared in Example 81, 4.2971 g, 16.4325 mmol) in ethyl acetate (109.55 mL, 16.433 mmol) was added 3-nitro-1,2-phenylenediamine (2.5165 g, 16.433 mmol) at room temperature and the resulting red mixture was stirred at room temperature. After 26 h of stirring at room temperature, the mixture was concentrated under reduced pressure to give 2-(bromomethyl)-3-(2-chlorophenyl)-5-nitroquinoxaline including its regioisomer as a red syrup: LC-MS (ESI) m/z 378.0 and 379.9 [M+H]+. The crude product as a red syrup was carried on crude without purification for the next step.

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