Metal‐Free and NBS‐Mediated Direct Thiol‐Disulfide Exchange Reaction to Access Unsymmetrical Disulfides

Abstract A metal‐free and N ‐Bromosuccinimide (NBS)‐mediated direct thiol‐disulfide exchange reaction at room temperature is developed. A variety of unsymmetrical disulfides have been prepared with good to excellent yields. Efficient late‐stage modification of amino acids and drugs demonstrates the utility of this strategy. In addition, easy to operate, broad substrate scope and good functional group tolerance further demonstrate that this reaction provides an essential complementary route to access unsymmetrical disulfides.