Synthesis of Substituted 2-Amino-6H-1,3-oxazin-6-ones

Derivatives of the unknown 2-amino-6H-1,3-oxazin-6-one 2 have been synthesized for the first time in two steps and in excellent yields, starting from N-cyanocarbonimidates 3a – c and cyanoacetates. The structures of 2a – c are assigned by NMR-spectroscopic methods and corroborated by an X-ray structure analysis of 2c .