The nitrosative cyclization of the aldehyde uracil-6-ylhydrazones in the presence of diethyl azodiformate gives the corresponding pyrimido[5,4-e]-as-triazine 4-oxides; several toxoflavin and fervenulin 4-oxides were prepared by this method. The compounds showed characteristic u.v. spectra.
F. Yoneda, T. Nagamatsu and K. Shinomura, J. Chem. Soc., Perkin Trans. 1, 1976, 713 DOI: 10.1039/P19760000713
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