Imidazole

Imidazole
Names
	IUPAC name 1H-Imidazole
	Other names 1,3-diazole; glyoxaline (archaic) ; 1,3-diazacyclopenta-2,4-diene
Identifiers
CAS Number	288-32-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:16069 ;
ChEMBL	ChEMBL540 ;
ChemSpider	773 ;
ECHA InfoCard	100.005.473
EC Number	206-019-2
KEGG	C01589 ;
PubChem CID	795;
RTECS number	NI3325000
	InChI InChI=1S/C3H4N2/c1-2-5-3-4-1/h1-3H,(H,4,5) Key: RAXXELZNTBOGNW-UHFFFAOYSA-N ; InChI=1/C3H4N2/c1-2-5-3-4-1/h1-3H,(H,4,5) Key: RAXXELZNTBOGNW-UHFFFAOYAS;
	SMILES c1cnc[nH]1;
Properties
Chemical formula	C3H4N2
Molar mass	68.077 g/mol
Appearance	white or pale yellow solid
Density	1.23 g/cm3, solid
Melting point	89 to 91 °C (192 to 196 °F; 362 to 364 K)
Boiling point	256 °C (493 °F; 529 K)
Solubility in water	633 g/L
Acidity (pKa)	6.95 (for the conjugate acid)
UV-vis (λmax)	206 nm
Structure
Crystal structure	monoclinic
Coordination geometry	planar 5-membered ring
Dipole moment	3.61 D
Hazards
Main hazards	Corrosive
Safety data sheet	External MSDS
R-phrases (outdated)	R20 R22 R34 R41
S-phrases (outdated)	S26 S36 S37 S39 S45
Flash point	146 °C (295 °F; 419 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Imidazole is an organic compound with the formula C₃N₂H₄. It is a white or colourless solid that is soluble in water, producing a mildly alkaline solution. In chemistry, it is an aromatic heterocycle, classified as a diazole, and having non-adjacent nitrogen atoms.

Many natural products, especially alkaloids, contain the imidazole ring. These imidazoles share the 1,3-C₃N₂ ring but feature varied substituents. This ring system is present in important biological building blocks, such as histidine and the related hormone histamine. Many drugs contain an imidazole ring, such as certain antifungal drugs, the nitroimidazole series of antibiotics, and the sedative midazolam.^[2]^[3]^[4]^[5]^[6]

When fused to a pyrimidine ring, it forms purine, which is the most widely occurring nitrogen-containing heterocycle in nature.^[7]

The name "imidazole" was coined in 1887 by the German chemist Arthur Rudolf Hantzsch (1857–1935).^[8]

Structure and properties[edit]

Imidazole is a planar 5-membered ring. It exists in two equivalent tautomeric forms, because the positive charge can be located on either of the two nitrogen atoms. Imidazole is a highly polar compound, as evidenced by its electric dipole moment of 3.67 D.^[9] It is highly soluble in water. The compound is classified as aromatic due to the presence of a sextet of π-electrons, consisting of a pair of electrons from the protonated nitrogen atom and one from each of the remaining four atoms of the ring. Some resonance structures of imidazole are shown below:

Amphoterism[edit]

Imidazole is amphoteric. That is, it can function as both an acid and as a base. As an acid, the pK_a of imidazole is 14.5, making it less acidic than carboxylic acids, phenols, and imides, but slightly more acidic than alcohols. The acidic proton is located on N-1. As a base, the pK_a of the conjugate acid (cited as pK_BH⁺ to avoid confusion between the two) is approximately 7, making imidazole approximately sixty times more basic than pyridine. The basic site is N3. Protonation gives the imidazolium cation, which is symmetrical.

Preparation[edit]

Imidazole was first reported in 1858 by the German-British chemist Heinrich Debus, although various imidazole derivatives had been discovered as early as the 1840s. It was shown that glyoxal, formaldehyde, and ammonia condense to form imidazole (glyoxaline, as it was originally named).^[10] This synthesis, while producing relatively low yields, is still used for generating C-substituted imidazoles.

In one microwave modification, the reactants are benzil, benzaldehyde and ammonia in glacial acetic acid, forming 2,4,5-triphenylimidazole ("lophine").^[11]

Imidazole can be synthesized by numerous methods besides the Debus method. Many of these syntheses can also be applied to substituted imidazoles by varying the functional groups on the reactants. These methods are commonly categorized by the number of reacting components.

One component

The (1,5) or (3,4) bond can be formed by the reaction of an imidate and an α-aminoaldehyde or α-aminoacetal. The example below applies to imidazole when R₁ = R₂ = hydrogen.

Two component

The (1,2) and (2,3) bonds can be formed by treating a 1,2-diaminoalkane, at high temperatures, with an alcohol, aldehyde, or carboxylic acid. A dehydrogenating catalyst, such as platinum on alumina, is required.

The (1,2) and (3,4) bonds can also be formed from N-substituted α-aminoketones and formamide with heat. The product will be a 1,4-disubstituted imidazole, but here since R₁ = R₂ = hydrogen, imidazole itself is the product. The yield of this reaction is moderate, but it seems to be the most effective method of making the 1,4 substitution.

Three component

This method proceeds in good yields for substituted imidazoles. An adaptation of the Debus method, it is called the Debus-Radziszewski imidazole synthesis. The starting materials are substituted glyoxal, aldehyde, amine, and ammonia or an ammonium salt.^[12]

Formation from other heterocycles

Imidazole can be synthesized by the photolysis of 1-vinyltetrazole. This reaction will give substantial yields only if the 1-vinyltetrazole is made efficiently from an organotin compound, such as 2-tributylstannyltetrazole. The reaction, shown below, produces imidazole when R₁ = R₂ = R₃ = hydrogen.

Imidazole can also be formed in a vapor-phase reaction. The reaction occurs with formamide, ethylenediamine, and hydrogen over platinum on alumina, and it must take place between 340 and 480 °C. This forms a very pure imidazole product.

Van Leusen reaction^[13]

The Van Leusen reaction can also be employed to form imidazoles starting from TosMIC and an aldimine. The Van Leusen Imidazole Synthesis allows the preparation of imidazoles from aldimines by reaction with tosylmethyl isocyanide (TosMIC). The reaction has later been expanded to a two-step synthesis in which the aldimine is generated in situ: the Van Leusen Three-Component Reaction (vL-3CR).

Biological significance and applications[edit]

Imidazole is incorporated into many important biological molecules. The most pervasive is the amino acid histidine, which has an imidazole side-chain. Histidine is present in many proteins and enzymes and plays a vital part in the structure and binding functions of hemoglobin. Imidazole-based histidine compounds play a very important role in intracellular buffering.^[14] Histidine can be decarboxylated to histamine, which is also a common biological compound. Histamine can cause urticaria (hives) when it is produced during allergic reaction. The relationship between histidine and histamine is shown below:

One of the applications of imidazole is in the purification of His-tagged proteins in immobilised metal affinity chromatography (IMAC). Imidazole is used to elute tagged proteins bound to nickel ions attached to the surface of beads in the chromatography column. An excess of imidazole is passed through the column, which displaces the His-tag from nickel coordination, freeing the His-tagged proteins.

Imidazole has become an important part of many pharmaceuticals. Synthetic imidazoles are present in many fungicides and antifungal, antiprotozoal, and antihypertensive medications. Imidazole is part of the theophylline molecule, found in tea leaves and coffee beans, that stimulates the central nervous system. It is present in the anticancer medication mercaptopurine, which combats leukemia by interfering with DNA activities.

A number of substituted imidazoles, including clotrimazole, are selective inhibitors of nitric oxide synthase, which makes them interesting drug targets in inflammation, neurodegenerative diseases and tumors of the nervous system.^[15]^[16] Other biological activities of the imidazole pharmacophore relate to the downregulation of intracellular Ca²⁺ and K⁺ fluxes, and interference with translation initiation.^[17]

Pharmaceutical derivatives[edit]

The substituted imidazole derivatives are valuable in treatment of many systemic fungal infections.^[18] Imidazoles belong to the class of azole antifungals, which includes ketoconazole, miconazole, and clotrimazole.

For comparison, another group of azoles is the triazoles, which includes fluconazole, itraconazole, and voriconazole. The difference between the imidazoles and the triazoles involves the mechanism of inhibition of the cytochrome P450 enzyme. The N3 of the imidazole compound binds to the heme iron atom of ferric cytochrome P450, whereas the N4 of the triazoles bind to the heme group. The triazoles have been shown to have a higher specificity for the cytochrome P450 than imidazoles, thereby making them more potent than the imidazoles.^[19]

Some imidazole derivatives show effects on insects, for example sulconazole nitrate exhibits a strong anti-feeding effect on the keratin-digesting Australian carpet beetle larvae Anthrenocerus australis, as does econazole nitrate with the common clothes moth Tineola bisselliella.^[20]

Industrial applications[edit]

Imidazole has been used extensively as a corrosion inhibitor on certain transition metals, such as copper. Preventing copper corrosion is important, especially in aqueous systems, where the conductivity of the copper decreases due to corrosion. Imidazoles can also be used as organic structure directing agents to synthesize zeollites.

Many compounds of industrial and technological importance contain imidazole derivatives. The thermostable polybenzimidazole (PBI) contains imidazole fused to a benzene ring and linked to a benzene, and acts as a fire retardant. Imidazole can also be found in various compounds that are used for photography and electronics.

Salts of imidazole[edit]

Simple imidazolium cation

Salts of imidazole where the imidazole ring is in the cation are known as imidazolium salts (for example, imidazolium chloride). These salts are formed from the protonation or substitution at nitrogen of imidazole. These salts have been used as ionic liquids and precursors to stable carbenes. Salts where a deprotonated imidazole is an anion are also well known; these salts are known as imidazolates (for example, sodium imidazolate, NaC₃H₃N₂).

Related heterocycles[edit]

Benzimidazole, an analog with a fused benzene ring
Dihydroimidazole or imidazoline, an analog where 4,5-double bond is saturated
Pyrrole, an analog with only one nitrogen atom in position 1
Oxazole, an analog with the nitrogen atom in position 1 replaced by oxygen
Thiazole, an analog with the nitrogen atom in position 1 replaced by sulfur
Pyrazole, an analog with two adjacent nitrogen atoms
Triazoles, analogs with three nitrogen atoms

References[edit]

^ Walba, H.; Isensee, R. W. (1961). "Acidity constants of some arylimidazoles and their cations". J. Org. Chem. 26 (8): 2789–2791. doi:10.1021/jo01066a039.
^ Karitzky, A. R.; Rees (1984). Comprehensive Heterocyclic Chemistry. 5. pp. 469–498.
^ Grimmett, M. Ross (1997). Imidazole and Benzimidazole Synthesis. Academic Press.
^ Brown, E. G. (1998). Ring Nitrogen and Key Biomolecules. Kluwer Academic Press.
^ Pozharskii, A. F.; et al. (1997). Heterocycles in Life and Society. John Wiley & Sons.
^ Gilchrist, T. L. (1985). Heterocyclic Chemistry. Bath Press. ISBN 978-0-582-01421-3.
^ Rosemeyer, H. (2004). "The Chemodiversity of Purine as a Constituent of Natural Products". Chemistry & Biodiversity. 1 (3): 361. doi:10.1002/cbdv.200490033.
^ Hantzsch, A. and Weber, J. H. (1887) "Ueber Verbindungen des Thiazols (Pyridins der Thiophenreihe)" (On compounds of thiazole (pyridines of the thiophene series), Berichte der deutschen chemischen Gesellschaft, 20 : 3118–3132, see p. 3119. See also: Hantzsch, A. (1888) "Allegemeine Bemerkungen über Azole" (General observations about azoles), Annalen der Chemie, 249 : 1–6. Hantzsch proposed a reform of the nomenclature of azole compounds, including a proposal to call the heterocyclic ring C₃H₃(NH)N "imidazole" ; see pp. 2 and 4.
^ Christen, Dines; Griffiths, John H.; Sheridan, John (1981). "The Microwave Spectrum of Imidazole; Complete Structure and the Electron Distribution from Nuclear Quadrupole Coupling Tensors and Dipole Moment Orientation". Zeitschrift für Naturforschung A. 36 (12): 1378–1385. Bibcode:1981ZNatA..36.1378C. doi:10.1515/zna-1981-1220.
^ Debus, Heinrich (1858). "Ueber die Einwirkung des Ammoniaks auf Glyoxal" [On the reaction of ammonia upon glyoxal]. Annalen der Chemie und Pharmacie. 107 (2): 199–208. doi:10.1002/jlac.18581070209. From p. 205: "Die gereinigte Substanz stellt das oxalsaure Salz einer Basis dar, die ich mit Glyoxalin bezeichenen werde." (The purified substance constitutes the oxalic salt of a base, which I will designate as "glyoxaline".)
^ Crouch, R. David; Howard, Jessica L.; Zile, Jennifer L.; Barker, Kathryn H. (2006). "Microwave-Mediated Synthesis of Lophine: Developing a Mechanism To Explain a Product". J. Chem. Educ. 83 (11): 1658. Bibcode:2006JChEd..83.1658C. doi:10.1021/ed083p1658.
^ US patent 6,177,575, Arduengo, A. J., "Process for Manufacture of Imidazoles", issued 2001-01-23
^ Van Leusen, Albert M.; Wildeman, Jurjen; Oldenziel, Otto H. (1977). "Chemistry of sulfonylmethyl isocyanides. 12. Base-induced cycloaddition of sulfonylmethyl isocyanides to carbon, nitrogen double bonds. Synthesis of 1,5-disubstituted and 1,4,5-trisubstituted imidazoles from aldimines and imidoyl chlorides". Journal of Organic Chemistry. 42 (7): 1153–1159. Bibcode:1977JOrgC..42.1153A. doi:10.1021/jo00427a012.
^ Hochachka, P. W.; Somero, G. N. (2002). Biochemical Adaptation: Mechanisms and Process in Physiological Evolution. New York: Oxford University Press.
^ Castaño, T.; Encinas, A.; Pérez, C.; Castro, A.; Campillo, N. E.; Gil, C. (2008). "Design, synthesis, and evaluation of potential inhibitors of nitric oxide synthase" (Submitted manuscript). Bioorg. Med. Chem. 16 (11): 6193–6206. doi:10.1016/j.bmc.2008.04.036. PMID 18477512.
^ Bogle, R. G.; Whitley, G. S.; Soo, S. C.; Johnstone, A. P.; Vallance, P. (1994). "Effect of anti-fungal imidazoles on mRNA levels and enzyme activity of inducible nitric oxide synthase". Br. J. Pharmacol. 111 (4): 1257–1261. doi:10.1111/j.1476-5381.1994.tb14881.x. PMC 1910171 . PMID 7518297.
^ Khalid, M. H.; Tokunaga, Y.; Caputy, A. J.; Walters, E. (2005). "Inhibition of tumor growth and prolonged survival of rats with intracranial gliomas following administration of clotrimazole". J. Neurosurg. 103 (1): 79–86. doi:10.3171/jns.2005.103.1.0079. PMID 16121977.
^ Leon Shargel. Comprehensive Pharmacy Review (6th ed.). p. 930.
^ Davis, Jennifer L.; Papich, Mark G.; Heit, Mark C. (2009). "Chapter 39: Antifungal and Antiviral Drugs". In Riviere, Jim E.; Papich, Mark G. Veterinary Pharmacology and Therapeutics (9th ed.). Wiley-Blackwell. pp. 1019–1020. ISBN 978-0-8138-2061-3.
^ Sunderland, M. R.; Cruickshank, R. H.; Leighs, S. J. (2014). "The efficacy of antifungal azole and antiprotozoal compounds in protection of wool from keratin-digesting insect larvae". Textile Res. J. 84 (9): 924–931. doi:10.1177/0040517513515312.