Volume 17, Issue 3 e1900493
Full Paper

Organocatalyzed Solvent Free and Efficient Synthesis of 2,4,5-Trisubstituted Imidazoles as Potential Acetylcholinesterase Inhibitors for Alzheimer's Disease

Sania Pervaiz

Sania Pervaiz

Department of Chemistry, Government College, University, Lahore, 54000 Pakistan

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Sadaf Mutahir

Corresponding Author

Sadaf Mutahir

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 P. R. China

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Islam Ullah

Corresponding Author

Islam Ullah

Department of Chemistry, Government College, University, Lahore, 54000 Pakistan

Department of Chemistry, Faculty of Sciences, University of Sialkot, Sialkot, 51040 Pakistan

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Muhammad Ashraf

Muhammad Ashraf

Department of Chemistry and Department of Biochemistry and Biotechnology, The Islamia University of Bahawalpur, Bahawalpur, 63100 Pakistan

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Xiao Liu

Xiao Liu

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 P. R. China

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Sidrah Tariq

Sidrah Tariq

Department of Chemistry, Government College, University, Lahore, 54000 Pakistan

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Bao-Jing Zhou

Bao-Jing Zhou

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 P. R. China

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Muhammad Asim Khan

Corresponding Author

Muhammad Asim Khan

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 P. R. China

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First published: 22 January 2020
Citations: 16

Abstract

The catalytic potential of pyridine-2-carboxlic acid has been evaluated for efficient, green and solvent free synthesis of 2,4,5-trisubstituted imidazole derivatives 3a3m. The compounds 3a3m were synthesized by one pot condensation reaction of substituted aromatic aldehydes, benzil, and ammonium acetate in good to excellent yields (74–96 %). To explore the potential of these compounds against Alzheimer's disease, their inhibitory activities against acetylcholinesterase (AChE) were evaluated. In this series of compounds, compound 3m, bearing one ethoxy and a hydroxy group on the phenyl ring on 2,4,5-trisubstituted imidazoles, proved to be a potent AChE inhibitor (102.56±0.14). Structure–activity relationship (SAR) of these compounds was developed. Molecular dockings were carried out for the compounds 3m, 3e, 3k, 3c, 3a, 3d, 3j, and 3f in order to further investigate the binding mechanism. The inhibitor molecule was molecularly docked with acetylcholinesterase to further study its binding mechanism. The amino group of the compound 3m forms an H-bond with the oxygen atom of the residue (i. e., THR121) which has a bond length of 3.051 Å.

Graphical Abstract

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