N-Alkyl cysteine-assisted thioesterification of peptides
摘要:
A new method for the preparation of peptide thioester by the post-solid phase peptide synthesis (SPPS) approach was developed. A series of N-alkyl cysteine derivatives were prepared and used as the C-terminus residue of the peptides prepared by the Fmoc SPPS. The synthetic peptides released from resin by TFA were readily converted to the peptide thioester in aqueous 3-mercaptopropionic acid (MPA) without significant side reactions. (c) 2006 Elsevier Ltd. All rights reserved.
Sustainable and efficient manufacturing methods for N-methylated peptides remain underexplored despite growing interest in therapeutic N-methylated peptides within the pharmaceutical industry. A methodology for the coupling of C-terminally unprotected N-methylamino acids mediated by an isostearic acid halide (ISTAX) and silylating reagent has been developed. This approach allows for the coupling of
[EN] BETA-HAIRPIN PEPTIDOMIMETICS<br/>[FR] PEPTIDOMIMÉTIQUES EN ÉPINGLE À CHEVEUX BÊTA
申请人:POLYPHOR AG
公开号:WO2016150576A1
公开(公告)日:2016-09-29
Beta-hairpin peptidomimetics of the general formula (I), and pharmaceutically acceptable salts thereof, with P, T, Q., and optionally L being elements as defined in the description and the claims, have Gram-negative antimicrobial activity to e.g. inhibit the growth or to kill microorganisms such as Klebsiellapneumoniae and/or Acinetobacter baumannii and/or Escherichia coli and/or Pseudomonas aeruginosa. They ca n be used as medicaments to treat or prevent infections or as disinfectants for foodstuffs, cosmetics, medicaments or other nutrient-containing materials. These peptidomimetics can be manufactured by a process which is based on a mixed solid- and solution phase synthetic strategy.
Solid-Phase Synthesis of Triostin A Using a Symmetrical Bis(diphenylmethyl) Linker System
作者:Ganesh A. Sable、Dongyeol Lim
DOI:10.1021/acs.joc.5b01055
日期:2015.8.7
was improved through exploration of two different solid-phase synthetic approaches under similar strategy. Mainly, this strategy was developed to enable the ease and rapid preparation of libraries of symmetric bicyclic depsipeptides. It also addresses several synthetic problems with our synthesis, including diketopiperazine (DKP) formation, poor cyclization yields and preparation of noncommercial N-methyl
Selective Bi-directional Amide Bond Cleavage of<i>N</i>-Methylcysteinyl Peptide
作者:Yibo Qiu、Xinya Hemu、Ding Xiang Liu、James P. Tam
DOI:10.1002/ejoc.201402261
日期:2014.7
A selective bi-directional peptidebondcleavage mediated by N-methylcysteine (MeCys) in Xaa-MeCys-Yaa peptides (Xaa and Yaa, non-cysteine residues) leading to thioesters and thiolactones is described. Rate and product analyses showed that an Nα-amide bondcleavage occurred at the Xaa-MeCys bond by an N–S acyl shift to generate an Xaa-S-(MeCys-Yaa) thioester at pH 1–5, whereas under strongly acidic
Biomimetic synthesis of cyclic peptides using novel thioester surrogates
作者:Xinya Hemu、Misako Taichi、Yibo Qiu、Ding‐Xiang Liu、James P. Tam
DOI:10.1002/bip.22308
日期:2013.9
Acyl shifts involving N‐S and S‐S rearrangements are reactions central to the breaking of a peptide bond and forming of thioester intermediates in an intein‐catalyzed protein splicing that ultimately leads to the formation of a new peptide bond by an uncatalyzed S‐Nacyl shift reaction. To mimic these three acyl shift reactions in forming thioesters and the subsequent peptide ligation, here we describe