Trimethoxyphenylthio as a Highly Labile Replacement for tert-Butylthio Cysteine Protection in Fmoc Solid Phase Synthesis
摘要:
Trimethoxyphenylthio (S-Tmp) is described as a novel cysteine protecting group in Fmoc solid phase peptide synthesis replacing the difficult to remove tert-butylthio. S-Tmp and dimethoxyphenylthio (S-Dmp) were successfully used for cysteine protection in a variety of peptides. Moreover, both groups can be removed in 5 min with mild reducing agents. S-Tmp is recommended for cysteine protection, as it yields crude peptides of high purity.
Biocompatible and Selective Generation of Bicyclic Peptides**
作者:Sven Ullrich、Josemon George、Alexandra E. Coram、Richard Morewood、Christoph Nitsche
DOI:10.1002/anie.202208400
日期:2022.10.24
Bicyclicpeptides are increasingly popular in drug discovery; however, only few strategies for their synthesis exist. Dicyanopyridine-featured amino acids provide a biocompatible, selective, and catalyst-free pathway to access bicyclicpeptides, which are characterized by superior preorganization and high target affinity.