Electrochemical diversification of cysteine derivatives and cysteine-containing peptides to phosphorothioates and sulfinates†

This study explores the application of modified cysteine in oligopeptides to overcome challenges in amino acid residue modification, with a focus on cysteine. Novel strategies for the functionalization of biomolecules are presented, with mechanistic investigations indicating the involvement of free radical processes, structural substitution, and nucleophilic displacement. Notably, the gram-scale synthesis of modified cysteine is achieved with high yields, highlighting its potential as a novel anti-fungus agent in biomedical and agrochemical research.