Reusable ammonium salt-tagged NHC–Cu(i) complexes: preparation and catalytic application in the three component click reaction

Abstract

A series of ammonium salt-tagged SIPr–Cu(I) complexes have been conveniently synthesized and characterized by NMR and HRMS. They are highly active toward the three component click reaction of benzyl bromide, NaN₃ and alkyne with water as solvent at rt. Current water soluble NHC–Cu(I) catalyst could be efficiently used at least four times with an 84% isolated yield of the desired triazole in the last run.