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.
S. Ahmed, R. Lofthouse and G. Shaw, J. Chem. Soc., Chem. Commun., 1974, 959a DOI: 10.1039/C3974000959A
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