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International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
Volume 8, Issue 12, December-2020, Impact Factor: 7.429, Available online at: www.ijaresm.com
IJARESM Publication, India >>>> www.ijaresm.com
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Recent Advances in the Exploration of Imidazole: A
Review
Sandeep Chauhan1, Navneet Singh2
1Department of Chemistry, School of Chemical Engineering and Physical Sciences,Lovely ProfessionalUniversity, Punjab,
India
2*Professor, Department of Chemistry, School of Chemical Engineering and Physical Science, Lovely Professional
University, Punjab, India
-----------------------------------------------------------------------*****************------------------------------------------------------------------
ABSTRACT
Imidazoles are important fine chemical raw materials and they possess notable biological and pharmaceutical
activity.Imidazole’s derivatives can be synthesized by a different reaction. Imidazole has been a focus of attention
among the research community due to its sundry nature. In this work we report recent advances in Imidazole
research, exploreproperties like flame-retardant curing agent, promote stem cell differentiation and repair focal
brain injury, high performance inverted solar cells, for lithium-ion conduction, for development of a Schottky
barrier diode, electrocatalytic CO2 reduction, the effect on biological activities and neural functions, targeting
dengue and yellow fever virus, against SARS-CoV-2, for deep-blue organic light-emitting diodes, cause cellular
toxicity by impairing redox balance, as a colorimetric and fluorometric sensor for selective, showing high proton
conductivity and improved physicochemical properties and inhibitory activity against the Metallo-β-lactamase IMP-
1. The activities associated with imidazole include anti-mycobacterial, antiparasitic, antiprotozoal, and
antihelminthic. and a human neuroblastoma cell line and a hepatocellular carcinoma cell line by usingthe imidazole
pyrroloquinoline (IPQ). Characterization of the structure of imidazole can be done by a different technique like
element analysis (CHS) and spectral analysis including Fourier-transform infrared spectroscopy (FTIR), 1H, 13C
NMR, and LC-MS. The present review paper also covers the latest method of synthesis for imidazole derivatives.
Keywords:Imidazole, antioxidant, SARS, antimicrobial, antibacterial, antiviral.
I. INTRODUCTION
The primitive knowledge explores that Imidazole is an organic compound (C3H4N2) containing two nitrogen atoms in the
five-membered heterocyclic rings at positions 1 and 3. Imidazole represents a special class of heterocyclic compounds that
possesses several industrial and biological activities[1].The imidazole derivatives are mainly used in medicine and
pesticide[2].The recent activities further explore thatImidazole showscharacteristics like low curing temperature and fast
curing rate which has gained rapid development in recent years [3]. Drugs inclusive of the imidazole basic structure have a
broad scope in clinical medicine.In addition to that the other activities include antibacterial [4], anticancer [5], anti-
tubercular[6], antifungal [7], anti-analgesic[8],anti-HIV[9], antioxidant[10], antidepressant[11] and antihypertensive
activity[12]. The antimicrobial activity has been performed against gram-positive bacteria (Staphylococcus aureus, Bacillus
subtilis) and Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa)[13].GelMA-imid hydrogel showed great
application potential for the physiological recovery of traumatic brain injury (TBI)[14]. The imidazole not only controls the
perovskite crystal growth generating increased domain size but also incorporates at the grain boundaries leading to
passivation of defects, due to the interaction between the PbI2 of Lewis acid and the imidazole of Lewis base[15].Imidazole
group can coordinate to Lewis acid as used in organic synthesis.Imidazole molecule also plays a role in the battery
cells,Imidazole is more electron-rich than imidazolium group. The imidazole group would affect the transportation of
lithium-ion in the solid polymer[16]. Imidazole derivative is known to have a high density of π-conjugated electron clouds
and is expected to show interesting electrical behavior.Imidazole derivative l-alkyl-2-(arylazo) imidazole (AAI) having
long alkyl chain is found to have photochemical and electrical characteristic[17],and as homogeneous electrocatalyst in
aqueous media for CO2 reduction[18].Imidazoles are found to be highly efficient in several environmental conditions
including nitric acid, sulphuric acid, hydrochloric acid, sodium chloride, atmospheric conditions, and sodium
hydroxide[19]. The ability of the Imidazole to be used as photosensitizers for UV light are also appreciable[20].
International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
Volume 8, Issue 12, December-2020, Impact Factor: 7.429, Available online at: www.ijaresm.com
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Page 1476
A. Pharmacological activities of Imidazole derivatives:The literature review further elaborates a few more
activities as cited in table I.
Table I
Imidazole derivative
Name
Pharmacological activity
References
Methyl-1- allyl-2-(4-
fluorophenyl)-5-phenyl-1H-
imidazole-4-acetate
Suppresses leukocyte
infiltration and exudation in
LPS-induced acute lung
injury
[21]
Imidazole
pyrroloquinoline(IPQ)
IPQ showed a weak
protective effect on the cells.
IPQ showed cognitive
effects in mice experiments.
[22]
5-(nitro/ bromo)-styryl-2-
benzimidazole
Antibacterial activity against
Staphylococcus aureus,
Escherichia coli.
[23]
2-methylamino
benzimidazole
Analgesic and anti-
inflammatory activity
[23]
Fluorescent aromatic-fused
imidazole
Antibacterial activity against
methicillin-resistant
Staphylococcus aureus
(MRSA).
[24]
1-methyl-4-nitro-1H-
imidazole
Antimicrobial activity
against pathogenic bacterial
and fungal species.
[25]
International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
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R=
7-chloro-4-aminoquinoline.
Against novel Coronavirus
(SARS-CoV-2).
[26]
[Cu(TCA)4](IMZ)2
Activity against Salmonella
typhi and an effective
activity against C. Albicans.
[27]
2,4,5-Trisubstituted imidazoles
Biological activity against
Alzheimer’s disease
[28]
B. Method of synthesis for imidazole derivatives: Recent advances in the area of Imidazole synthesis have been
reported through the following schemes.
Tagareet. al. prepared novel imidazole-alkyl spacer-carbazole-based fluorophores for deep-blue organic light-emitting
diodes as per scheme I [29].
Scheme I
Allahresaniet. al.reportedthe Catalytic activity of Co(II) Salen@KCC-1 on the synthesis of 2,4,5-triphenyl1H-imidazoles
and benzimidazoles as per scheme II [30].
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Scheme II
Liu et.al.synthesized and characterized N-(arylmethylene)-benzimidazole/imidazole-borane compounds as per scheme III
[31].
Scheme III
Tan et. al. prepared novel and efficient multifunctional periodic mesoporous organosilica supported benzotriazole ionic
liquids for the reusable synthesis of 2,4,5- trisubstituted imidazoles as per scheme IV [32].
Scheme IV
International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
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Adeyemi et. al.reportednew Imidazoles causing cellular toxicity by impairing redox balance, mitochondrial membrane
potential, and modulation of HIF-1a expression as per scheme V [33].
Scheme V
Ulahannanet. al.synthesized imidazole derivatives and carried out DFT studies of the structure - NLO activity evaluation of
2-(4-methoxyphenyl)-1,4,5-triphenyl-2,5-dihydro-1H-imidazole as per scheme VI [34].
Scheme VI
Bhaskar et. al. prepared rationally designed imidazole derivatives as a colorimetric and fluorometric sensor for selective,
qualitative, and quantitative cyanide ion detection in real-time samples as per scheme VII [35].
Scheme VII
Tang et. al.synthesized polyfunctionalimidazoles from vinyl azides and amidine along with NHBoc as a leaving group as
per scheme VIII [36].
Scheme VIII
Ibisogluet. al. prepared a new cyclotriphosphazene ligand containing imidazole rings and its one-dimensional copper(II)
coordination polymer as per scheme IX [37].
International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
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Scheme IX
Kumar et.al.synthesized metal complexes of a tertiary phosphine, 2-(2-(diphenylphosphaneyl)-1H-imidazole-1-yl)pyridine
containing pyridyl and imidazole moieties as per scheme X [38].
Scheme X
Obledo-Benicioet. al.reportedstructural analysis of intramolecular 1,5-type O/O and S/O interactions in diethyl 2-oxo and
diethyl 2-thioxo-1H benzo[d] imidazole-1,3(2H)-dicarboxylate: Experimental and theoretical study as per scheme XI [39].
Scheme XI
Slassi et. al. prepared crystal structure, DFT calculations, Hirshfeld surfaces, and antibacterial activities of Schiff base
based on imidazole as per scheme XII [40].
Scheme XII
Arjomandiet. al.synthesizedand investigated inhibitory activities of imidazole derivatives against the Metallo-β-lactamase
IMP-1 as per scheme XIII [41].
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Scheme XIII
Takashima et. al. reported the selective synthesis of 1,4,5-trisubstituted imidazoles from a-amino ketones prepared by N-
heterocyclic-carbene-catalyzed arylation as per scheme XIV [42].
Scheme XIV
Rha et. al. reported an effective phthalazine-imidazole-based chemosensor for detecting Cu2+, Co2+, and S2− via the color
change as per scheme XV [43].
Scheme XV
CONCLUSION
Recent activities as reported in Imidazole research are included in this review articles which demonstrated its footprint in
almost every field, from the solar cell to focal brain injury, from light-emitting diode to SARS-COV-2. Its association with
the most demanding field of today’s generation, make it a special and demanding molecule. The novel method of synthesis
as reported by the research community in the present work further endorse the potential of Imidazole which can be
harnessedfor medicine, industrial, biological,and other activities.
ACKNOWLEDGMENT
The authors are very thankful to the Lovely Professional University for providing the necessary resources for this research
work. Conflict of Interest
The authors declare no conflict of interest.
International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
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Page 1483
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International Journal of All Research Education and Scientific Methods (IJARESM), ISSN: 2455-6211
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