A new simple method for establishing a crosslink between tryptophan and cysteine leading to tryptathionine (1), involving the reaction of 3a-hydroxy-1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole-2-carboxylic acid (2) with cysteine in 25% trifluoroacetic acid, is described.
W. E. Savige and A. Fontana, J. Chem. Soc., Chem. Commun., 1976, 600 DOI: 10.1039/C39760000600
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