نتایج جستجو برای: transamidation

تعداد نتایج: 189  

Journal: :The Journal of pharmacology and experimental therapeutics 2008
Y Dai N L Dudek T B Patel N A Muma

Transglutaminase (TGase)-induced activation of small G proteins via 5-hydroxytryptamine (HT)(2A) receptor signaling leads to platelet aggregation (Cell 115:851-862, 2003). We hypothesize that stimulation of 5-HT(2A) receptors in neurons activates TGase, resulting in transamidation of serotonin to a small G protein, Rac1, thereby constitutively activating Rac1. Using immunoprecipitation and immu...

Journal: :Chemical science 2017
Jacob E Dander Emma L Baker Neil K Garg

Transamidation, or the conversion of one amide to another, is a long-standing challenge in organic synthesis. Although notable progress has been made in the transamidation of primary amides, the transamidation of secondary amides has remained underdeveloped, especially when considering aliphatic substrates. Herein, we report a two-step approach to achieve the transamidation of secondary aliphat...

2016
Emma L. Baker Michael M. Yamano Yujing Zhou Sarah M. Anthony Neil K. Garg

A long-standing challenge in synthetic chemistry is the development of the transamidation reaction. This process, which involves the conversion of one amide to another, is typically plagued by unfavourable kinetic and thermodynamic factors. Although some advances have been made with regard to the transamidation of primary amide substrates, secondary amide transamidation has remained elusive. He...

2017
Lin Zhou Yvonne M C Kooy-Winkelaar Robert A Cordfunke Irina Dragan Allan Thompson Jan Wouter Drijfhout Peter A van Veelen Hongbing Chen Frits Koning

Wheat gluten confers superior baking quality to wheat based products but elicits a pro-inflammatory immune response in patients with celiac disease. Transamidation of gluten by microbial transglutaminase (mTG) and tissue transglutaminase (tTG) reduces the immunogenicity of gluten; however, little information is available on the minimal modification sufficient to eliminate gliadin immunogenicity...

Journal: :Chemical Papers 2023

Abstract In recent years, transamidation has been an essential topic in the formation of amide bonds over conventional route due to chemoselectivity and greenside products. So many groups have disclosed new transformation techniques. Transamidation is typically classified into two categories based on activation: activated unactivated amide. We conducted a review pertinent literature that discus...

Journal: :Polymer Chemistry 2023

The effect of neighbouring fluorine atom activation on transamidation is demonstrated through molecular kinetic/DFT studies and vitrimer applications.

Journal: :Journal of the American Chemical Society 2008
Justin M Hoerter Karin M Otte Samuel H Gellman Qiang Cui Shannon S Stahl

Cleavage of the C-N bond of carboxamides generally requires harsh conditions. This study reveals that tris(amido)Al(III) catalysts, such as Al2(NMe2)6, promote facile equilibrium-controlled transamidation of tertiary carboxamides with secondary amines. The mechanism of these reactions was investigated by kinetic, spectroscopic, and density functional theory (DFT) computational methods. The cata...

Journal: :Journal of the American Chemical Society 2007
Denis A Kissounko Justin M Hoerter Ilia A Guzei Qiang Cui Samuel H Gellman Shannon S Stahl

Titanium(IV)-mediated reactions between primary amines and secondary carboxamides exhibit different outcomes, amidine formation versus transamidation, depending on the identity of the TiIV complex used and the reaction conditions employed. The present study probes the origin of this divergent behavior. We find that stoichiometric TiIV, either Cp*TiIV complexes or Ti(NMe2)4, promotes formation o...

2014
Nathalie Ollivier Annick Blanpain Emmanuelle Boll Laurent Raibaut Hervé Drobecq Oleg Melnyk

Selenopeptides can be transamidated by cysteinyl peptides in water using mild conditions (pH 5.5, 37 °C) in the presence of an arylthiol catalyst. Similar conditions also catalyze the metathesis of selenopeptides. The usefulness of the selenophosphine derived from TCEP (TCEP═Se) for inhibiting the TCEP-induced deselenization of selenocysteine residue is also reported.

2016
Salvatore Moscaritolo Lucia Treppiccione Antonio Ottombrino Mauro Rossi

Celiac disease (CD) is an immune-mediated disorder caused by the ingestion of wheat gluten. A lifelong, gluten-free diet is required to alleviate symptoms and to normalize the intestinal mucosa. We previously found that transamidation reaction by microbial transglutaminase (mTG) was effective in down-regulating the gliadin-specific immune response in CD patients. In this study, the two-step tra...

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