A selective stepwise arylation of S−H and N−H bonds in unprotected peptides by air- and moisture- stable PtIV complexes is reported. These compounds showed high reactivity and selectivity toward the N terminal NH2 group over other N−H bonds in complex biologically relevant substrates.
A mild chemoselective method for S-arylation of cysteine has been developed in an open-flask procedure under metal-free conditions using arenediazoniumsalts in methanol.