Investigation on metal and halogen dependent cyclization of schiff base or reduced schiff base precursor into fluorescent pyrido 1 2 a quinoxalin 11 ylium derivatives

Abstract

Quinoxalines are an important class of heterocyclic compounds used as dyes pharmaceuticals and the moiety is present in a number of antibiotics 1 Previously the synthesis of a new tricyclic quinoxaline derivative pyrido 1 2 a quinoxalin 11 ylium perchlorate P1 ClO4 formed by Cu II mediated cyclization of a simple Schiff base precursor was published by Koner and Ray 2 Structurally only three other tricyclic heterocycles with similar structure are known Figure 1 The 3 5 benzo e pyrido 2