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Protein & Peptide Letters


ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

A Comprehensive One-Pot Synthesis of Protected Cysteine and Selenocysteine SPPS Derivatives

Author(s): Stevenson Flemer Jr.

Volume 21 , Issue 12 , 2014

Page: [1257 - 1264] Pages: 8

DOI: 10.2174/0929866521666140526094224

Price: $65


A proof-of-principle methodology is presented in which all commercially-available cysteine (Cys) and selenocysteine (Sec) solid phase peptide synthesis (SPPS) derivatives are synthesized in high yield from easily prepared protected dichalcogenide precursors. A Zn-mediated biphasic reduction process applied to a series of four bis-Nα-protected dichalcogenide compounds allows facile conversion to their corresponding thiol and selenol intermediates followed by insitu S- or Se-alkylation with various electrophiles to directly access twenty one known Cys and Sec SPPS derivatives. Most of these derivatives were able to be precipitated in crude form out of petroleum ether in sufficient purity for direct use as peptide building blocks. Subsequent incorporation of these derivatives into peptide models nicely illustrates their viability and applicability toward SPPS.

Keywords: Cysteine protection, selenocysteine protection, peptide synthesis.

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