An automated synthesis system, which is suitable for repetitive syntheses using similar reaction procedures, was used to synthesize systematically a library of all possible dipeptides (25) and tripeptides (125) from 5 protected amino acids. The apparatus has also been applied to the automated synthesis of 10 fragment tripeptide derivatives that are constituents of the hormone PACAP-27. The measured molecular optical rotation values of the library of 125 tripeptides were found to correlate well with calculated values obtained by summation of the molecular optical rotation values for the constituent amino acids.
[EN] MACROCYCLIZATION OF PEPTIDOMIMETICS<br/>[FR] MACROCYCLISATION DE PEPTIDOMIMÉTIQUES
申请人:UNIV WARWICK
公开号:WO2019186174A1
公开(公告)日:2019-10-03
The invention provides an improved method of macrocyclization of peptidomimetics, as measured by isolated yields and product distribution, which comprises substitution of one or more of the backbone amide C=O bonds with a turn-inducing motif. The method is general with enhancements seen across a range of ring sizes (e.g. tri-, tetra-, penta- and hexapeptides). Specifically, the invention provides a peptidomimetic macrocycle comprising a carbonyl bioisosteric turn-inducing element having the structure: (I) wherein X is a heteroatom; and wherein R1 to R6 are each independently selected from alkyl, aryl, heteroaryl and H.
Highly Sterically Hindered Peptide Bond Formation between α,α-Disubstituted α-Amino Acids and <i>N</i>-Alkyl Cysteines Using α,α-Disubstituted α-Amidonitrile
作者:Xiaoling Wang、Jing Li、Yujiro Hayashi
DOI:10.1021/jacs.2c02993
日期:2022.6.15
sterically hindered peptides, research on peptides bearing an amide bond between an α,α-disubstituted α-aminoacid and an N-alkyl α-aminoacid remains underexplored because of the lack of an efficient synthetic approach. Herein, we describe a high-yielding synthetic method to access such extremely sterically hindered peptide bonds between amino acids. The reaction takes place between a peptide with an α,α-disubstituted