Synthesis of new spin labels for Cu-free click conjugation
作者:Tamás Kálai、Mark R. Fleissner、József Jekő、Wayne L. Hubbell、Kálmán Hideg
DOI:10.1016/j.tetlet.2011.03.077
日期:2011.5
New pyrroline nitroxides attached to a terminal acetylenic sulfone, a dibenzocyclooctyne or a cyclooctyne carboxylic acid were synthesized and tested in Cu-free click reactions to conjugate these newspinlabels with 4-azido-TEMPO, azidophenylalanine and an azidophenylalanine-containing protein.
Synthesis and functional survey of new Tacrine analogs modified with nitroxides or their precursors
作者:Tamás Kálai、Robin Altman、Izumi Maezawa、Mária Balog、Christophe Morisseau、Jitka Petrlova、Bruce D. Hammock、Lee-Way Jin、James R. Trudell、John C. Voss、Kálmán Hideg
DOI:10.1016/j.ejmech.2014.03.026
日期:2014.4
A series of new Tacrine analogs modified with nitroxides or pre-nitroxides on 9-amino group via methylene or piperazine spacers were synthesized; the nitroxide or its precursors were incorporated into the Tacrine scaffold. The new compounds were tested for their hydroxyl radical and peroxyl radical scavenging ability, acetylcholinesterase inhibitor activity and protection against Aβ-induced cytotoxicity
azide-alkyne 1,3-dipolar cycloadditions (CuAAC) with paramagnetic azide and alkyne building blocks are described. This method provides a route to the synthesis of complex spin-labeled molecules such as amino acids, carbohydrates, drug molecules and biradicals. acetylenes - amino acids - azides - click chemistry - free radicals
Electrochemical and Electrostatic Cleavage of Alkoxyamines
作者:Long Zhang、Eduardo Laborda、Nadim Darwish、Benjamin B. Noble、Jason H. Tyrell、Sandra Pluczyk、Anton P. Le Brun、Gordon G. Wallace、Joaquin Gonzalez、Michelle L. Coote、Simone Ciampi
DOI:10.1021/jacs.7b11628
日期:2018.1.17
sciences. Here we show that the one-electron oxidation of an alkoxyamine leads to a cation radical intermediate that even at room temperature rapidly fragments, releasing a nitroxide and carbocation. Digital simulations of experimental voltammetry and current-time transients suggest that the unimoleculardecomposition which yields the "unmasked" nitroxide (TEMPO) is exceedingly rapid and irreversible. High-level
Conjugation of Nucleosides and Oligonucleotides by [3+2] Cycloaddition
作者:Anup M. Jawalekar、Nico Meeuwenoord、J. (Sjef) G. O. Cremers、Herman S. Overkleeft、Gijs A. van der Marel、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1021/jo702023s
日期:2008.1.1
presented for copper(I)-catalyzed [3+2] cycloaddition of nucleosides and nucleotides in near-quantitative yield. Azido−alkyne cycloaddition was applied for the preparation of a range of adenosine dimers and derivatives with versatile functionality, as well as for the smooth condensation of two oligonucleotide strands. The described technology may find valuable application in the synthesis of oligonucleotide