A Ring Opening-Annulation Reaction of Anthra[1,2- d ][1,2,3]triazine-4,7,12(3 H )-trione in the Presence of Pyridines as an Efficient Approach to the Construction of Naphtho[2,3- H ]pyrido(quinolino)[2,1- b ]quinazoline System.

The [1,2,3]triazin-4(3 H )-one ring is a synthetically important molecular platform for a variety of chemical transformations. Despite this, currently, there has been little research on the reaction of the thermal opening of the [1,2,3]triazin-4(3 H )-one nucleus. In this work, we describe the synthetic potential of anthra[1,2- d ][1,2,3]triazine-4,7,12(3 H )-trione in the reaction of the thermal opening of a cycle following the [4+2]-cycloaddition reaction with a number of pyridine derivatives and quinoline. It is shown that this method is effective for the synthesis of the 6 H -naphtho[2,3- H ]pyrido(quinolino)[2,1- b ]quinazoline-6,9,14-trione system. We also investigate the influence of the position of substituents in the structure of pyridine on the formation characteristics of the target products.