In vitro Study of Furazano[3,4-b]quinoxaline 1-Oxides as Potential Releasing Agents

Furazano[3,4-b]quinoxaline 1-oxides indicate significant chemical reactivity and release NO fragments in their electron impact mass spectra. A series of fused furazan N-oxide derivatives were synthesized and tested in vitro as potential NO releasing agents in the presence of L- cysteine used as a thiol cofactor. The synthesized compounds were determined using cysteine as cofactor and Griess reagent. The yield in nitrite for each compound was expressed as % NO2- (mol/mol). Compound 4c showed the higher NO releasing ability among the tested furazan N-oxide derivatives. A new class of NO-donors, Furazano[3,4-b]quinoxaline 1-Oxides hybrids was developed by joining NOdonor furoxan moiety to substituted quinoxaline 1-Oxides. It seems that lipophilicity and stereochemistry of the X substitution influences the NO donating behavior.