be deprotected with concomitant formation of a disulphide bond connecting the two Cys residues. A mechanistic study on the disulphide formation led to a general protocol for deprotection of the S-Acm group by CuSO4 and a 1,2-aminothiol under aerobic conditions. Application of this new deprotection reaction allowed for the synthesis of Apamin, a peptide with two-disulphides in a one-pot/stepwise disulphide-bridging
Theoretical and experimental work has been conducted about possibleprebioticsyntheses of cysteine. Activated derivatives of this amino acid are able to oligomerize and polymerize to afford various poly‐thiazolines and cysteine‐rich chains.