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Cu@U-g-C3N4 Catalyzed Cyclization of o-Phenylenediamines for the Synthesis of Benzimidazoles by Using CO2 and Dimethylamine Borane as a Hydrogen Source

  • Vishal V. Phatake
  • Bhalchandra M. BhanageEmail author
Article
  • 35 Downloads

Abstract

This work reports a green and sustainable route for the synthesis of benzimidazoles via C–N bond formation using carbon dioxide (CO2) as a C1 carbon source. In this work, Cu@U-g-C3N4 catalyst was prepared from urea derived porous graphitic carbon nitride (U-g-C3N4) and CuCl2 and characterized by FT-IR, XRD, XPS, SEM, TPD etc. The Cu@U-g-C3N4 as a heterogeneous recyclable catalyst has been employed first time for the cyclization of o-phenylenediamines (OPD) with CO2 to benzimidazoles using dimethylamine borane (DMAB). The proposed protocol becomes sustainable and efficient due to the use of propylene carbonate/water as a suitable biodegradable, economical and environmentally benign solvent system. The proposed catalytic system showed a wide range of substrate scope for the synthesis of benzimidazoles in good to excellent yields.

Graphical Abstract

Keywords

Cu@U-g-C3N4 Heterogeneous catalyst Carbon dioxide fixation DMAB Amines Green solvent Benzimidazoles 

Notes

Acknowledgements

The author Vishal V. Phatake would like to thanks University Grant Commission (UGC), New Delhi, India for providing a Junior Research Fellowship under UGC-NET JRF scheme.

Compliance with Ethical Standards

Conflict of interest

No conflict of interest, for each contributing author.

Supplementary material

10562_2018_2608_MOESM1_ESM.doc (2.3 mb)
Supplementary material 1 (DOC 2397 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ChemistryInstitute of Chemical Technology (ICT)MumbaiIndia

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