The synthesis of a <sup>99m</sup>Tc-labeled tetravalent targeting probe upon isonitrile coordination to <sup>99m</sup>Tc<sup>I</sup> for enhanced target uptake in saturable systems
A Peptide Backbone Stapling Strategy Enabled by the Multicomponent Incorporation of Amide N‐Substituents
作者:Manuel G. Ricardo、Javiel F. Marrrero、Oscar Valdés、Daniel G. Rivera、Ludger A. Wessjohann
DOI:10.1002/chem.201805318
日期:2019.1.14
N‐modification of peptides on solid‐phase is presented as a powerful and general method to enable peptidestapling at the backbone instead of the side chains. This work shows that a variety of functionalized N‐substituents suitable for backbone stapling can be readily introduced by means of on‐resin Ugi multicomponent reactions conducted during solid‐phase peptide synthesis. Diverse macrocyclization chemistries
Evaluation and comparison of
<sup>99m</sup>
Tc‐labeled
<scp>d</scp>
‐glucosamine derivatives with different
<sup>99m</sup>
Tc cores as potential tumor imaging agents
[99mTc(I)(CO)3]+ core and [99mTc(I)]+ core to produce stable 99mTc complexes, therefore developing a 99mTc‐labeled isocyanide complex for single‐photon emission computed tomography (SPECT) imaging is considered to be of great interest. In order to develop potentialtumorimagingagents with satisfied tumor uptake and suitable pharmacokinetic properties in vivo, a novel d‐glucosamine isocyanide derivative, 4‐isocyano‐N‐(2
The 99mTc-labeled conjugates of the vasopressin (AVP) peptide and of its analogue d(CH2)5[d-Tyr(Et2)-Ile4-Eda9]AVP (AVP(an)) have been synthesized using the technetium complexes with tetradentate tripodal chelator (the tris(2-mercaptoethyl)amine (NS3)) and the monodentate isocyanide ligand (CN-peptide). The conjugates exhibit high stability in the presence of 100 times the molar excess of standard
radiopharmaceuticals, an EGFR inhibitor such as 4-aminoquinazoline derivatives along with a radionuclide such as technetium-99m (99mTc) could be ideal. Thus, we report herein the synthesis, characterization, and biological evaluation of new “4 + 1” mixed-ligand ReIII- and 99mTcIII-complexes of the general formula [99mTc][Tc(NS3)(CN-R)] bearing tris(2-mercaptoethyl)-amine (NS3) as the tetradentate tripodal