New procedure for the synthesis of cystine-peptides by oxidation of S-substituted cysteine-peptides with thallium(III) trifluoroacetate

Abstract

Thallium(III) trifluroacetate cleaves various S-protecting groups of cysteine in trifluoroacetic acid forming cystine; as examples, three model peptides, oxytocin, urotensin II, and a human calcitonin gene-related peptide, were prepared by direct oxidative conversion of the respective S-substituted cysteine-peptides.