Boc-Cys(S-Pyr)-OH and Z-Cys(S-Pyr)-OH were prepared by addition of their cysteine derivatives to 3 equiv of 2,2'-dipyridyldisulfide in one portion. 2-Mercaptopyridine was removed by addition of 0.1 M Cu(NO3)2 to the solution. Both derivatives are white solids and can be used to ...
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Preparations of Boc‐Cys(S‐Pyr)‐OH and Z‐Cys(S‐Pyr)‐OH and their applications in orthogonal coupling of unprotected peptide segmentsdoi:10.1111/j.1399-3011.1998.tb00426.xHaihong HuangRobert I. CareyJ Pept Res