The p-methoxyphenylsulphonyl group attached at the Nim function of histidine can be quantitatively cleaved by trifluoroacetic acid in the presence of dimethyl sulphide at room temperature within 1 h; the Nim-tosyl group was also cleaved under similar conditions, but at a slower rate.
K. Kitagawa, K. Kitade, Y. Kiso, T. Akita, S. Funakoshi, N. Fujii and H. Yajima, J. Chem. Soc., Chem. Commun., 1979, 955 DOI: 10.1039/C39790000955
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