The tosyl group attached at the guanidino function of arginine can be efficiently cleaved by a thioanisole–trifluoromethanesulphonic acid system, which can deprotect O-2,6-dichlorobenzyltyrosine without the formation of O-to-C rearrangement products; the NG-mesitylene-2-sulphonyl group was also cleaved by a thioanisole–trifluoroacetic acid system.
Y. Kiso, M. Satomi, K. Ukawa and T. Akita, J. Chem. Soc., Chem. Commun., 1980, 1063 DOI: 10.1039/C39800001063
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