The products formed from the reaction of aromatic aldehydes and ammonium acetate with pentane-2,4-dione are 5-acetyl-2,4-diaryl-6-methyl-1,2,3,4-tetrahydropyrimidines; when 1-phenyl-2-phenylsulfonylethan-1-one is used instead of pentane-2,4-dione, 3-aryl-3-arylmethyleneamino-1 -phenyl-2phenylsulfonylpropan-1-ones are formed. There is no evidence of oxazine formation.
C. N. O'Callaghan and T. B. H. McMurry, J. Chem. Soc., Perkin Trans. 1, 1993, 755 DOI: 10.1039/P19930000755
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