Paudler, William W. published the artcileBromination of some pyridine and diazine N-oxides, SDS of cas: 31401-45-3, the publication is Journal of Organic Chemistry (1983), 48(7), 1064-9, database is CAplus.
Selected monosubstituted pyridines, pyrazines, pyrimidines, and their N-oxides, having an electron-donating substituent, were successfully brominated under very mild conditions. The N-oxide function itself is not sufficient to cause these π-deficient systems to undergo electrophilic aromatic halogenation. Only strongly electron-donating substituents (amino groups) activate the heterocyclic nucleus toward bromination. These substituents direct the electrophilic substitution ortho/para to them with or without the N-oxide group present. Pyridine and diazines with moderately activating substituents such as alkoxy groups are brominated only when their ortho/para activation is augmented by the activation of the N-oxide function. Failure to brominate 5-methoxypyrimidine 1-oxide may well reflect the greater π deficiency of the pyrimidine ring.
Journal of Organic Chemistry published new progress about 31401-45-3. 31401-45-3 belongs to pyrimidines, auxiliary class Pyrimidine,Amine, name is N,N-Dimethylpyrimidin-4-amine, and the molecular formula is C6H9N3, SDS of cas: 31401-45-3.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia