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Synthesis, Antimicrobial and Cholinesterase Enzymes Inhibitory Activities of Indeno Imidazoles and X-Ray Crystal Structure of 3a,8a-Dihydroxy-1,3-diphenyl-1,3,3a,8a-tetrahydro-indeno[1,2-d]imidazole-2,8-dione

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Abstract

Two indeno imidazoles have been synthesized by the reaction of ninhydrin with diphenylurea and diphenylthiourea. The structures have been determined by spectral analysis. The supramolecular behavior of 3a,8a-Dihydroxy-1,3-diphenyl-1,3,3a,8a-tetrahydro-indeno[1,2-d]imidazole-2,8-dione (1) was thoroughly analyzed and reported using X-ray single crystal technique and concepts. The presence of oxygen and nitrogen atoms led to very interesting supramolecular motifs interactions such as nitrogen–oxygen, nitrogen–nitrogen, oxygen–oxygen, nitrogen–hydrogen, and oxygen–hydrogen. 3a,8a-dihydroxy-1,3-diphenyl-2-thioxo-2,3,3a,8a-tetrahydro-1H-indeno[1,2-d]imidazol-8-one 2 showed good antibacterial activity against B. subtilis and P. aeruginosa, while 3a,8a-dihydroxy-1,3-diphenyl-1,3,3a,8a-tetrahydro-indeno[1,2-d]imidazole-2,8-dione 1 only showed antibacterial activity against P. aeruginosa. Both of 1 and 2 were inactive against C. albicans. Derivative 2 demonstrated good cholinesterase enzyme activity unlike derivative 1 which has weak inhibitory activity against these enzymes. Furthermore, 2 was found to be a selective butyrylcholinesterase enzyme inhibitor that has potential use for prevention of further neurodegeneration as well for symptomatic treatment of Alzheimer patients.

Graphical Abstract

The non-covalent interactions involved in the crystal structure of 3a,8a-Dihydroxy-1,3-diphenyl-1,3,3a,8a-tetrahydro-indeno[1,2-d]imidazole-2,8-dione (1) were investigated and reported in terms of crystal engineering and supramolecular chemistry. Different motifs of N···H and O···H interactions as well as N···O, N···N, and O···O are adopted by the crystal structure and led to a strong crystal packing.

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Acknowledgments

We would like to acknowledge Universiti Sains Malaysia (USM) for the Postdoctoral Fellowship to Dr. Raza Murad Ghalib. We would also like to thank Ms Liew Wai Lam, Ms Claira Arul Aruldass and Mr Mani Maran Marimuthu for their contribution in the present study.

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Correspondence to Raza Murad Ghalib.

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Ghalib, R.M., Hashim, R., Alshahateet, S.F. et al. Synthesis, Antimicrobial and Cholinesterase Enzymes Inhibitory Activities of Indeno Imidazoles and X-Ray Crystal Structure of 3a,8a-Dihydroxy-1,3-diphenyl-1,3,3a,8a-tetrahydro-indeno[1,2-d]imidazole-2,8-dione. J Chem Crystallogr 42, 783–789 (2012). https://doi.org/10.1007/s10870-012-0288-7

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