Experimental study demonstrates direct oxidative conversion of S-protected cysteine peptides to cystines using thallium(III) trifluoroacetate, suggesting a simplified route for cyclic peptide...
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.
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Fujii et al. (1987) studied this question.
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