Structural Chemistry

, Volume 28, Issue 3, pp 675–686 | Cite as

A theoretical study on the efficiency and role of guanidines-based organic superbases on carbon dioxide utilization in quinazoline-2,4(1H, 3H)-diones synthesis

  • Hossein Sabet-Sarvestani
  • Hossein Eshghi
  • Mohammad Izadyar
Original Research


Superbases DBU, DBN, TMG and MTBD are efficient catalysts which have been used in the solvent-free conversion of carbon dioxide and 2-aminobenzonitrile to quinazoline-2,4(1H, 3H)-diones. For the final product, four tautomeric forms have been considered which the stability of the preferred tautomer has been studied by NBO analysis. In this research, two different mechanisms have been proposed for the catalytic behavior of the superbases which can act as a base or a nucleophile in the reaction. Theoretical studies show that two primary steps are the rate-determining step (RDS) of the mechanism. QTAIM analysis and local nucleophilicity index were used for investigation of the molecular aspects of the RDSs. Finally, it has been confirmed the basic role of the applied superbases is more important than nucleophilicity and DBU is the best candidate as an efficient catalyst for this reaction.


Organic superbases Quinazoline-2,4(1H, 3H)-diones Carbon dioxide Catalyst 



Research Council of Ferdowsi University of Mashhad is gratefully acknowledged for the financial support of this project (Grant No 2/40883). Also, we hereby acknowledge that some parts of this computation were performed in the HPC center of Ferdowsi University of Mashhad.

Supplementary material

11224_2016_842_MOESM1_ESM.docx (136 kb)
Supplementary tables and Cartesian coordinates of the molecules. This material is available free of charge via… (DOCX 135 kb)


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of SciencesFerdowsi University of MashhadMashhadIran

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