Racemisation during esterification of N-protected amino-acids by dicyclohexylcarbodi-imide–4-dimethylaminopyridine (DCC–DMAP) can be avoided by use of the 2-nitrophenylsulphenyl(Nps) protecting group.
B. Neises, T. Andries and W. Steglich, J. Chem. Soc., Chem. Commun., 1982, 1132 DOI: 10.1039/C39820001132
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