Late-stage specific and selective modifications of peptides and proteins at target residues under ambient conditions are the most facile routes to various bioconjugates. Here, the authors report an orthogonal modification of cysteine residues using alkyl thianthreium salts, which proceeds with excellent chemoselectivity and compatibility under mild conditions, introducing a diverse array of functional structures.
- Guangjun Bao
- Xinyi Song
- Rui Wang
