The traceless Staudinger ligation for indirect<sup>18</sup>F-radiolabelling
作者:Laurence Carroll、Sophie Boldon、Romain Bejot、Jane E. Moore、Jérôme Declerck、Véronique Gouverneur
DOI:10.1039/c0ob00564a
日期:——
The Staudingerligation of phosphine-substituted thioesters with 18F-fluoroethylazide has been successfully applied to access 18F-labelled molecules in radiochemical yields superior to 95%; the first fluorous variant of a Staudinger radio-ligation has been validated.
Ligation method and reagents to form an amide bond
申请人:——
公开号:US20040087779A1
公开(公告)日:2004-05-06
Methods and reagents for the formation of amide bonds between an activated carboxylic acid derivative and an azide useful in the synthesis of peptides, proteins and derivatized or labeled amino acids, peptide or proteins. The method involves the formation of a phosphinothioester which reacts with an azide resulting in amide formation. The invention provides phosphinothiol reagents which convert activated carboxylic acid derivatives to phosphinothioesters which then react with azides to form an amide bond. The methods and reagents of the invention can be used for stepwise synthesis of peptides on solid supports or for the ligation to two or more amino acids, two or more peptide or two or more protein fragments.
A facile synthetic method for peptide-porphyrin conjugates containing four peptide units on one porphyrin was developed using chemoselective reactions. The key building blocks, 5,10,15,20-tetrakis(3-azidophenyl) porphyrin 1 and 5,10,15,20-tetrakis(5-azido-3-pyridyl) porphyrin 2, were efficiently synthesized and used as substrates for two well-known chemoselective reactions, traceless Staudinger ligation and copper-catalyzed azide alkyne cycloaddition (so-called click chemistry). Both reactions gave the desired compounds, and click chemistry was superior for our purpose. To confirm the value of the established methodology, nine peptide-porphyrin conjugates were synthesized, and their catalase-and peroxidase-like activity in water was evaluated. Our synthetic strategy is expected to be valuable for the preparation of artificial heme protein models. (C) 2010 Elsevier Ltd. All rights reserved.
Application of Staudinger Ligation in PET Imaging
申请人:Kasi Dhanalakshmi
公开号:US20130005972A1
公开(公告)日:2013-01-03
A method for generating a radiolabeled tracer. The method includes providing a phosphine molecule having at least one carbocyclic, aromatic, or pyrrolidinyl ring with an OH substitute. The OH of this phosphines molecule is then condensed with an acid to produce a phosphine ester. Staudinger ligation is then performed to generate the radiolabeled tracer by treating the phosphine ester with a radiolabeled azide having a PET radioisotope moiety.