Synthesis of as-triazino[5,6-b]quinoline,a new heterocyclic ring system

The first representatives of a new ring system, 3-oxo-2,3,4,10-tetrahydro-as-triazino[5,6-b]quinoline and some of its derivatives were synthesized by cyclization of the appropriate (2-aminobenzyl)-triazines. These substances are in equilibrium with the tautomer 1,2,3,4-tetrahydro form.