Abstract
A highly efficient and simple Fmoc-based preparation of peptide αthioesters is presented. After Fmoc/ t-butyl solid-phase synthesis on 2-chlorotrityl resin the C-terminal carboxylic group of the protected peptide is directly converted to the corresponding thioester. The method leads to very high yields, shows a low level of epimerization and can be easily applied also for the preparation of long peptide αthioesters as demonstrated for the 41 amino acid N-terminal fragment of pro-neuropeptide Y (proNPY 1–40).
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