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Cu(OTf)2‐mediated cross‐coupling of nitriles and N‐heterocycles with arylboronic acids to generate nitrilium and pyridinium products

Authors :
Bell, Nicola L.
Xu, Chao
Fyfe, James W.B.
Vantourout, Julien C.
Brals, Jeremy
Chabbra, Sonia
Bode, Bela E.
Cordes, David B.
Slawin, Alexandra M.Z.
McGuire, Thomas M.
Watson, Allan J.B.
Publication Year :
2021
Publisher :
Wiley, 2021.

Abstract

Metal-catalyzed C–N cross-coupling generally forms C−N bonds by reductive elimination from metal complexes bearing covalent C- and N-ligands. We have identified a Cu-mediated C–N cross-coupling that uses a dative N-ligand in the bond-forming event, which, in contrast to conventional methods, generates reactive cationic products. Mechanistic studies suggest the process operates via transmetalation of an aryl organoboron to a CuII complex bearing neutral N-ligands, such as nitriles or N-heterocycles. Subsequent generation of a putative CuIII complex enables the oxidative C–N coupling to take place, delivering nitrilium intermediates and pyridinium products. The reaction is general for a range of N(sp) and N(sp2) precursors and can be applied to drug synthesis and late-stage N-arylation, and the limitations in the methodology are mechanistically evidenced.

Details

Language :
English
ISSN :
14337851
Database :
OpenAIRE
Accession number :
edsair.core.ac.uk....4bd2eac1981788931bb703f3b6eb54ca