α‐Bromoketones undergo selenium dioxide oxidation to yield reactive 2‐oxo‐2‐arylacetyl bromides that are trapped by aryl‐1,2‐diamines, 1,2‐aminophenol or 1,2‐aminothiophenol to give quinoxalinones, benzoxazinones, and benzothiazinones, respectively, in good yield.
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Nagaraj et al. (2013) studied this question.
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