In vitro antioxidant potential study of some synthetic quinoxalines.

In continuation of our study the in vitro antioxidant activity of some novel quinoxaline derivatives was investigated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) method with respect to ascorbic acid. To determine the antioxidant activity, a number of substituted indoxyls (3A-G), cyclic ketones (2A-G), and quinoxalines (1A-G) were synthesized by both microwave and conventional heating methods. The present findings revealed that some quinoxalines and their precursors (1D, 1F, 1G and 2E) exhibited a marked scavenging effect on DPPH radical.