Treatment of 2H-1,3-oxazine-2,4(3H)-diones (1) with potassium cyanide caused a ring transformation to afford 5-imino-1,5-dihydro-2H-pyrrol-2-ones (2).
M. Yogo, K. Hirota and Y. Maki, J. Chem. Soc., Chem. Commun., 1984, 332 DOI: 10.1039/C39840000332
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