1,2,4-triazines and condensed derivatives—XVI : 1-oxo-1,2-dihydro- and 1-oxo-1,2,6,7-tetrahydro[1,2,4]triazino[1,6-c]-quinazolin-5-ium salts. Synthesis and some reactions

Methylation of the type 1 and 2 triazinoquinazoliumolates yields the oxotriazinoquinazolinium salts of types 7 and 8, respectively. 4a similarly furnishes 9. Acid induced degradations and NaBH₄ reductions of compounds 7–9, their conversions into the corresponding pseudobases (10, 11) as well as methods of synthesis of the novel oxotriazinoquinazoliniumolates (16) are described.