Cystine reacts reversibly with tyrosine and dopa in hydrobromic acid to give 3-cystein-S-yltyrosine (6) and cystein-S-yldopas (3)–(5) in an electrophilic reaction involving HO2CCH(NH2)CH2S+, the sulphenyl ion from cysteine.
S. Ito and G. Prota, J. Chem. Soc., Chem. Commun., 1977, 251 DOI: 10.1039/C39770000251
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