Green and Efficient Methods for One-Pot Aerobic Oxidative Synthesis of Benzimidazoles from Alcohols with TEMPO-PEG4000-NHC-Cu(II) Complex in Water

Author： Wang Zhao-gang   Cao Xiao-hua   Yang Yao   Lu Ming  

Publisher： Taylor & Francis Ltd

E-ISSN： 1532-2432|45|12|1476-1483

ISSN： 0039-7911

Source： Synthetic Communications, Vol.45, Iss.12, 2015-06, pp. : 1476-1483

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Abstract

In this article, an amphiphilic catalyst TEMPO-PEG4000-NHC-Cu(II) [2,2,6,6-tetramethylpiperidine-1-oxyl/polyethylene glycol/N-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.

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