Green and Efficient Methods for One-Pot Aerobic Oxidative Synthesis of Benzimidazoles from Alcohols with TEMPO-PEG<sub>4000</sub>-NHC-Cu(II) Complex in Water

<div><p></p><p>In this article, an amphiphilic catalyst TEMPO-PEG<sub>4000</sub>-NHC-Cu(II) [2,2,6,6-tetramethylpiperidine-1-oxyl/polyethylene glycol/<i>N</i>-heterocyclic carbene] complex was synthesized and used as a highly efficient catalyst for one-pot aerobic oxidative synthesis of benzimidazoles from alcohols. The reactions were applicable in water with good yields in the presence of catalyst (5 mol%). Moreover, the catalyst was easily recovered from the reaction mixture and reused with almost consistent activity.</p></div>