Entry for the Table of Contents Modular, supramolecular catalysts based on the coiled coil peptide scaffold and designed to mimic nonribosomal peptide synthetases are demonstrated to catalyze the formation of diketopiperazine and linear dipeptides for several aminoacyl substrates. We further demonstrate that the nature of the active site residues in the peptide catalysts can be used to effect directed intermodular aminoacyl transfer processes and govern the relative yields of diketopiperazine, linear dipeptide, and hydrolyzed substrate.
Fmoc-Based Synthesis of Peptide Thioacids for Azide Ligations <i>via</i> 2-Cyanoethyl Thioesters
作者:Richard Raz、Jörg Rademann
DOI:10.1021/ol302247h
日期:2012.10.5
preparation of peptide thioacids from 2-cyanoethyl peptide thioesters has been accomplished. S-2-Cyanoethyl peptide thioesters were obtained cleanly without the need for purification from resin-bound tert-butyl peptide thioesters using 3-mercaptopropionitrile as a nucleophile. Elimination of the 2-cyanoethyl group proceeded rapidly (t1/2 < 8 min) under mild conditions and furnished peptide thioacids up
Solution- and solid-phase Staudinger-mediated cyclizations were assessed to efficiently prepare hetero-2,5-diketopiperazines from their protected azido dipeptide thioesters under microwave irradiation. Short reaction time, good yields and ease of purification are the main assets of this methodology.