Abstract
2,3-Dihydro-6-methyl-1,3-oxazine-2,4-dione has been prepared from NN-dimethylurea with either diketen or ethyl acetoacetate and the analogous 6-phenyl oxazine derivative from NN-dimethylurea and ethyl benzoyl acetate in acetic acid–acetic anhydride solution; structures of the oxazines were confirmed by 13C n.m.r. spectra and by subsequent conversion with ammonia or amines into substituted uracils.
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More From: Journal of the Chemical Society, Chemical Communications
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