4.6 Article

A post-synthetically modified metal-organic framework for copper catalyzed denitrative C-N coupling of nitroarenes under heterogeneous conditions

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NEW JOURNAL OF CHEMISTRY
卷 45, 期 12, 页码 5568-5575

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj05711h

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  1. CSIR, New Delhi
  2. Council of Scientific and Industrial Research (CSIR), New Delhi [01(2944)/18/EMR-II]
  3. Department of Science and Technology, Govt. of India

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This study reports the Ullmann C-N coupling reaction of nitroarenes using a copper containing metal-organic framework (MOF) catalyst under heterogenous conditions for the first time. The protocol suppresses by-product formation in catalytic reactions, and the catalyst was designed and synthesized through a two-step post-synthesis functionalization process.
Here we report, for the first time, the Ullmann C-N coupling reaction of nitroarenes which is achieved by using a copper containing metal-organic framework (MOF) catalyst under heterogenous conditions. The ready availability of nitroarenes and their low cost have made them ideal replacements for haloarenes as electrophilic coupling partners. Notably, the reaction protocol suppresses the by-product formation in the catalytic reaction. The catalyst has been designed and synthesized by two step post-synthesis functionalization of a MOF, viz. dabco MOF-1 with a -NH2 functional group (DMOF-NH2). In the post-synthetic treatment, salicylaldehyde has been used for organic modification first and then copper(ii) was successfully incorporated onto the inner surface of the porous material. The hybrid porous solid thus obtained has been employed in the catalytic C-N coupling reaction of nitroarenes with a wide variety of amines under heterogeneous conditions, which displayed very high turnover frequencies (TOF) in catalytic reactions attesting its efficacy towards the N-arylation reaction.

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