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Recent Advances in the Exploration of Imidazole: A Review

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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, explore properties 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), 1 H, 13 C NMR, and LC-MS. The present review paper also covers the latest method of synthesis for imidazole derivatives.
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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
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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]
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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
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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].
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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.
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Article
Full-text available
A series of periodic mesoporous organosilica supported benzotriazolium ionic liquids were synthesized and tested as effective and practical heterogeneous catalysts in the condensation reaction of diphenylethanedione, aromatic aldehydes and ammonium acetate. The catalyst [email protected](1.0) showed brilliant catalytic activity for the synthesis of 2,4,5-trisubstituted imidazoles with good to high yields. We also found that the catalytic activity could be significantly influenced by the loading levels and functional anions of the benzotriazolium-cation ionic liquid, probably due to an intensification of intramolecular synergistic effect. Furthermore, the multifunctional catalyst [email protected](1.0) could be easily recovered by filtration and recycled for six times with no significant loss in activity, indicating its excellent stability and reusability. This method provides an efficient and environmentally-friendly procedure for the production of 2,4,5-trisubstituted imidazoles.
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Imidazole represents a special class of heterocyclic compounds that possesses several industrial and biological activities. Imidazole and its derivatives are extensively employed as corrosion inhibitors for different metals in different electrolytes. Most of the imidazole based compounds behaved as mixed and interface type corrosion inhibitors and their adsorption mechanism obeyed the Langmuir adsorption isotherm model. Generally, imidazole and its derivatives interact with metallic surface using electron rich centers. Present article also describes collection of major studies that described the anticorrosive effect of imidazole and its derivatives.
Article
In this paper we report the photophysical and electrical characteristics of our synthesized imidazole derivative namely l-alkyl-2-(arylazo) imidazole (AAI) organized in Langmuir-Blodgett (LB) films towards the development of organic Schottky barrier diode (SBD). Presence of long alkyl chain in the molecule make it suitable for LB technology and may favour aggregations of the molecules in LB films under barrier compression. The interfacial properties of the formation of Langmuir monolayer of AAI at air-water interface have been studied by surface pressure versus area per molecule (π-A) isotherm and compressibility modulus. Hysteresis study of the isotherm confirmed the formation of stable monolayer of AAI molecular assemblies at air-water interface. The aggregation of AAI molecules in LB films is confirmed by Ultraviolet–visible (UV–vis) absorption, fluorescence emission spectroscopy and Atomic force microscopic (AFM) methods. AAI molecules also formed network type morphology in LB films due to their closure association and aggregations or cluster of molecules which were evidenced by AFM technique. The compression induced aggregations of AAI is reflected as broadened nature of monomeric absorption band along with the emergence of a new absorption band at longer wavelength side for LB film deposited at surface pressure of 25 mN/m. The optical absorption bands of AAI and the corresponding transitions between different electronic states have been simulated by density functional theoretical (DFT) analysis and is compared with the experimental results. Nonlinear behaviour of the current-voltage characteristics and various relevant electrical parameters of the LB film device at the interface of metal electrode (gold) satisfy the necessary conditions showing the properties of a Schottky barrier diode.
Article
N-(arylmethylene)-benzimidazole/imidazole-borane compounds (7-10) based on ferrocene/benzene were synthesized in a cost-effective way by reacting N-(arylmethylene)-benzimidazole/imidazoles with ammonium sulfate ((NH4)2SO4) and sodium borohydride (NaBH4). The structures of compounds 7-9 were determined by X-ray crystallography. Four compounds displayed high thermal decomposition temperatures (182-256°C) according to the thermogravimetry (TG) measurements. Interestingly, these compounds showed promising applications as potential propellant due to their spontaneous combustion upon contact concentrated HNO3 (≥ 95 %) and catalytic effect on the thermal degradation of ammonium perchlorate (AP).
Article
A series of fluorescent emitters based on Imidazole-Alkyl spacer-Carbazole were designed and synthesized by connecting donor and acceptor moieties through alkyl spacer. In these design strategy we have chosen carbazole as electron rich and imidazole as electron deficient with deferent functional black (phenyl and phenyl substituted) at the N1 position of imidazole moiety. All the fluorophores were structurally confirmed by spectroscopic methods (NMR, MASS, and FTIR). The photophysical, electrochemical and electroluminescence properties were thoroughlyexamined. All the fluorophores showed good thermal stability and near-UV emission with high photoluminescence quantum yield (PLQY)of ~59% in the solid state. All the synthesized compounds feature Commission International de L'Eclairage (CIE) coordinates of y < 0.08 for a particular doping concentration, which is very close to the National Television Standards Committee (NTSC) standard blue (0.14, 0.08). Solution-processed organic light emitting diode (OLED) device consisting of molecule BIPOCz displays a maximum external quantum efficiency EQE of 1.9% with CIE coordinates of (0.17, 0.07). All these results reveal that this work provides novel approaches for realizing ultra-deep-blue emission with high performance.
Article
A tertiary phosphine, [2-{PPh2C3H2N2}C5H4N] (2), containing both imidazole and pyridine moieties was synthesized by the reaction of 2-(1H-imidazol-1-yl)pyridine (1) with nBuLi followed by the addition of PPh2Cl. Reactions of 2 with group 6 metal carbonyls and group 10 metal salts resulted in chelate complexes [{2{PPh2C3H2N2}C5H4N}{M(CO)4}] (3, M = Mo; 4, M = W) and [{2-{PPh2C3H2N2}C5H4N}{MCl2}] (5, M = Pd; 6, M = Pt). However, 1:1 reactions of 2 with CuX (X = Cl, Br, I) yielded dinuclear complexes [{2-{PPh2C3H2N2}C5H4N}{CuX}]2 (7, X = Cl; 8, X = Br; 9, X = I) containing [Cu(μ-X)]2 rhombus units, whereas the reaction between 2 and [Cu(NCMe)4]BF4 produced a spirocyclic complex, [{2-{PPh2C3H2N2}C5H4N}2Cu]BF4 (10). The molecular structures of complexes 4, 6 and 8 were determined using X-ray diffraction studies. Upon coordination, the bite angle of the ligand varies from 78.76(6)° (4) to 96.16(2)° (8) due to inherent flexibility associated with the ligand framework as well as the geometries preferred by the metal atoms.
Article
Because of the fast increase in deaths due to Corona Viral Infection in majority region in the world, the detection of drugs potent of this infection is a major need. With this idea, docking study was executed on eighteen imidazole derivatives based on 7-chloro-4-aminoquinoline against novel Coronavirus (SARS-CoV-2). In this study, we carried out a docking study of these molecules in the active site of SARS-CoV-2 main protease. The result indicate that Molecules N° 3, 7 and 14 have more binding energy with SARS-CoV-2 main protease recently crystallized (pdb code 6LU7) in comparison with the other imidazole derivatives and the two drug; Chloroquine and hydroxychloroquine. Because of the best energy of interaction, these three molecules could have the most potential antiviral treatment of COVID-19 than the other studied compounds. The structures with best affinity in the binding site of the protease have more than 3 cycles and electronegative atoms in the structure. This may increase the binding affinity of these molecules because of formation of π-bonds, halogen interactions and/or Hydrogen bond interactions between compounds and the enzyme. So, compounds with more cycles and electronegative atoms could have a potent inhibition of SARS-CoV-2 main protease.
Article
The synthesis, reactions and biological properties of imidazoles and benzimidazole make up the bulk of the ring chemistry. In this study, the reaction between different types of aromatic aldehydes and ammonium acetate with diphenylethanedione, in ethanol solvent, using the Co(II) Salen [email protected] catalyst which is produced from Co (II) complex which is supported onto the KCC-1 was studied. The results showed that the products were synthesized in good to excellent yields. The products were identified with IR and NMR spectroscopy. Also, the catalyst was identified by FT-IR, TGA, TEM, and XRD. Finally, The catalyst was reused several times without lack of catalytic activity.
Article
The liver-expressed antimicrobial peptide-2 (LEAP-2) is an important component of the innate immune defense system and plays an important role in resisting the invasion of pathogenic microorganisms. In this study, LEAP-2 from golden pompano (Trachinotus ovatus) was characterized and its expression in response to Photobacterium damselae was investigated. The full-length LEAP-2 cDNA was 1758 bp, which comprised a 5′-UTR of 250 bp, an ORF of 321 bp, and a 3′-UTR of 1187 bp, encoding 106 amino acids. LEAP-2 consisted of a conserved saposin B domain and four conserved cysteines that formed two pairs of disulphide bonds. The genomic organization of LEAP-2 was also determined and shown to consisted of three introns and two exons. The predicted promoter region of ToLEAP-2 contained several putative transcription factor binding sites. Quantitative real-time (qRT-PCR) analysis indicated that LEAP-2 was ubiquitously expressed in all examined tissues, with higher mRNA levels observed in the muscle, liver, spleen, and kidney. After P. damselae stimulation, the expression level of LEAP-2 mRNA was significantly upregulated in various tissues of golden pompano. In addition, SDS-PAGE showed that the molecular mass of recombinant LEAP-2 expressed in pET-32a was approximately 23 kDa. The purified recombinant protein showed antibacterial activity against Gram-positive and Gram-negative bacteria. Luciferase reporters were constructed for five deletion fragments of different lengths from the promoter region (−1575 bp to +251 bp), and the results showed that L3 (−659 bp to +251 bp) presented the highest activity, and it was therefore defined as the core region of the LEAP-2 promoter. The seven predicted transcription factor binding sites were deleted by using PCR technology, and the results showed that the mutation of the USF transcription factor binding site caused the activity to significantly decrease. The results indicate that golden pompano LEAP-2 potentially exhibits antimicrobial effects in fish innate immunity.
Article
Background Our previous reports demonstrated the prospects of a new series of imidazoles as a source of alternative anti-parasite treatments, thus warranting further studies that include toxicity profiling. Objective In this study, we evaluated three imidazoles: bis-imidazole (compound 1), phenyl-substituted 1H-imidazole (compound 2), and thiopene-imidazole (compound 3) for cellular toxicity and possible mechanisms. Methods The three (3) compounds were assessed for in vitro cytotoxic action. Additionally, we probed likely mechanistic actions of these imidazoles. Findings showed dose-dependent cellular toxicity by these imidazoles. Results In the presence of antioxidant (Trolox), cytotoxicity was improved for compounds 2 and 3 but not for compound 1. Meantime, compound 7 promoted reactive oxygen species (ROS) production, which was abated in the presence of a standard antioxidant (Trolox). Additionally, the three (3) imidazoles impaired mitochondrial membrane potential (MMP). While MMP was not restored after treatment removal, the addition of antioxidant (Trolox) improved MMP for compounds 2 and 3 treatment. Additionally, compound 1 elevated expression of hypoxia-inducing factor 1-alpha (HIF-1α). This may not be unconnected with the capacity of compound 1 to cause oxidative stress. Conclusion We show evidence that supports the cytotoxic action of imidazoles involves likely impairment to redox balance and mitochondrial membrane potential. The findings help our understanding of the mechanistic action of these imidazoles in living cells, and altogether may boost their prospects as new and alternative anti-protozoans.