A photochemical acyl thiol-ene reaction can be used to rapidly cyclise fully unprotected peptides bearing both a thioacid and alkene to form peptide thiolactones. This strategy represents the first reported synthesis of peptide thiolactones under radical-mediated conditions.
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http://dx.doi.org/10.1039/d4cc02442g | DOI Listing |
Macromol Rapid Commun
November 2024
Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281-S4, Ghent, 9000, Belgium.
Aromatic esters are amongst the oldest known chemical motifs that allow for thermal (re)processing of thermosetting polymers. Moreover, phenyl esters are generally known as activated esters that do not require a catalyst to undergo acyl transfer reactions. Even though dynamic aromatic esters find applications in commercialized thermoset formulations, all-aromatic esters have found limited use so far in the design of covalent adaptable networks (CAN) as a result of their high glass transition temperature (T) and specific curing process.
View Article and Find Full Text PDFChem Commun (Camb)
July 2024
Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
A photochemical acyl thiol-ene reaction can be used to rapidly cyclise fully unprotected peptides bearing both a thioacid and alkene to form peptide thiolactones. This strategy represents the first reported synthesis of peptide thiolactones under radical-mediated conditions.
View Article and Find Full Text PDFJ Am Chem Soc
March 2023
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
The development of a mild, atom- and step-economical catalytic strategy that effectively generates value-added molecules directly from readily available commodity chemicals is a central goal of organic synthesis. In this context, the thiol-ene click chemistry for carbon-sulfur (C-S) bond construction has found widespread applications in the synthesis of pharmaceuticals and functional materials. In contrast, the selective carbonyl thiyl radical addition to carbon-carbon multiple bonds remains underdeveloped.
View Article and Find Full Text PDFACS Med Chem Lett
October 2022
Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai 200092, China.
The orexigenic peptide ghrelin exerts important functions in energy metabolism and has therapeutic potential to treat certain diseases. Native ghrelin carries an essential -fatty acyl moiety; however, this post-translational modification is susceptible to hydrolysis by certain esterases in circulation, representing a major route of its in vivo inactivation. In the present study, we developed a novel approach to prepare various esterase-resistant ghrelin analogs via photoinduced thiol-ene click chemistry.
View Article and Find Full Text PDFOrg Biomol Chem
April 2021
School of Chemical Sciences, The University of Auckland, 23 Symonds St., Auckland 1010, New Zealand. and School of Biological Sciences, The University of Auckland, 3A Symonds St., Auckland 1010, New Zealand and MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand and Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds St., Auckland 1010, New Zealand.
In this work we report the synthesis of mono lipidated peptides containing a 3-mercaptopropionate linker in the N-terminus by means of a photoinitiated thiol-ene reaction (S-lipidation). We evaluate the self-assembling and hydrogelation properties of a library of mono S-lipidated peptides containing lipid chains of various lengths and demonstrate that hydrogelation was driven by a balance between the lipid chain's hydrophobicity and the peptide's facial hydrophobicity. We further postulate that a simple calculation using estimated values of log D could be used as a predictor of hydrogelation when designing similar systems.
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