Synthesis and evaluation of NO-release from symmetrically substituted furoxans

A series of symmetrically substituted dibenzoyl furoxans were synthesized and investigated for their potential to release nitric oxide, which plays a key role in the nervous and cardiovascular systems. Cysteine was employed to promote nitric oxide release from furoxan via the formation of an S-nitrosothiol intermediate. Transition metal ion-mediated S-nitrosocysteine decomposition liberates nitric oxide that, in aqueous aerobic solutions, is converted to reactive nitrogen oxide species. The percent nitric oxide released was quantified colorimetrically by the Griess reagent system.