Abstract
The reaction of γ-bromoacetoacetyl bromide (1) with N-arylhydroxylamines (2) afforded N-(γ-bromoacetoacetyl)-N-arylhydroxylamines (3), which were treated with sodium methoxide to give 2-aryltetrahydro-2H-1, 2-oxazine-3, 5-dione (4). Treatment of 3 with hydroxylamine directly afforded the 5-oxime derivatives of 4 (7), which could be transformed to 4 by mild hydrolysis with dilute mineral acid.
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