title: A new synthesis of pyrimido(4,5-e)-as-triazine 4-oxides by nitrosative cyclization of aldehyde uracil-6-ylhydrazones in the presence of diethyl azodiformate.
mesh_terms: D000447:Aldehydes; D003497:Cyclic N-Oxides / Q000138:chemical synthesis*; D005561:Formates; D006835:Hydrazones; D008722:Methods; D009603:Nitroso Compounds; D011743:Pyrimidines / Q000138:chemical synthesis; D014227:Triazines / Q000138:chemical synthesis*; D014498:Uracil / Q000031:analogs & derivatives*
chemical_list: D000447:Aldehydes; D003497:Cyclic N-Oxides; D005561:Formates; D006835:Hydrazones; D009603:Nitroso Compounds; D011743:Pyrimidines; D014227:Triazines; D014498:Uracil