Quinoline

Last updated
Quinoline [1]
Quinoline chemical structure.svg
C=black, H=white, N=blue Quinoline-3D-balls-2.png
C=black, H=white, N=blue
C=black, H=white, N=blue Quinoline-3D-spacefill.png
C=black, H=white, N=blue
Names
Preferred IUPAC name
Quinoline [2]
Systematic IUPAC name
  • 1-Benzopyridine
  • Benzo[b]pyridine
  • 2-Azabicyclo[4.4.0]deca-1(6),2,4,7,9-pentaene
  • 2-Azabicyclo[4.4.0]deca-1,3,5,7,9-pentaene
  • Benzo[b]azine
  • Benzo[b]azabenzene
Other names
  • 1-Azanaphthalene
  • 1-Benzazine
  • Benzazine
  • Benzazabenzene
  • Benzopyridine
  • 1-Benzine
  • Quinolin
  • Chinoline
  • Chinoleine
  • Chinolin
  • Leucol
  • Leukol
  • Leucoline
Identifiers
3D model (JSmol)
3DMet
107477
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.865 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 202-051-6
27201
KEGG
MeSH Quinolines
PubChem CID
RTECS number
  • VA9275000
UNII
UN number 2656
  • InChI=1S/C9H7N/c1-2-6-9-8(4-1)5-3-7-10-9/h1-7H Yes check.svgY
    Key: SMWDFEZZVXVKRB-UHFFFAOYSA-N Yes check.svgY
  • InChI=1/C9H7N/c1-2-6-9-8(4-1)5-3-7-10-9/h1-7H
    Key: SMWDFEZZVXVKRB-UHFFFAOYAU
  • n1cccc2ccccc12
  • C1=CC=C2C(=C1)C=CC=N2
Properties
C9H7N
Molar mass 129.16 g/mol
AppearanceColorless oily liquid
Density 1.093 g/mL
Melting point −15 °C (5 °F; 258 K)
Boiling point 237 °C (459 °F; 510 K) , 760 mmHg; 108–110 °C (226–230 °F), 11 mmHg
Slightly soluble
Solubility Soluble in alcohol, ether, and carbon disulfide
Acidity (pKa)4.85 (conjugated acid) [3]
−86.0·10−6 cm3/mol
Thermochemistry
174.9 kJ·mol−1
Hazards
GHS labelling:
GHS-pictogram-exclam.svg GHS-pictogram-silhouette.svg GHS-pictogram-pollu.svg
Danger
H302, H312, H315, H319, H341, H350, H411
P201, P202, P264, P270, P273, P280, P281, P301+P312, P302+P352, P305+P351+P338, P308+P313, P312, P321, P322, P330, P332+P313, P337+P313, P362, P363, P391, P405, P501
NFPA 704 (fire diamond)
NFPA 704.svgHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
1
0
Flash point 101 °C (214 °F; 374 K)
400 °C (752 °F; 673 K)
Lethal dose or concentration (LD, LC):
331 mg/kg
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Yes check.svgY  verify  (what is  Yes check.svgYX mark.svgN ?)

Quinoline is a heterocyclic aromatic organic compound with the chemical formula C9H7N. It is a colorless hygroscopic liquid with a strong odor. Aged samples, especially if exposed to light, become yellow and later brown. Quinoline is only slightly soluble in cold water but dissolves readily in hot water and most organic solvents. [4] Quinoline itself has few applications, but many of its derivatives are useful in diverse applications. A prominent example is quinine, an alkaloid found in plants. Over 200 biologically active quinoline and quinazoline alkaloids are identified. [5] [6] 4-Hydroxy-2-alkylquinolines (HAQs) are involved in antibiotic resistance.

Contents

Occurrence and isolation

Quinoline was first extracted from coal tar in 1834 by German chemist Friedlieb Ferdinand Runge; [4] he called quinoline leukol ("white oil" in Greek). [7] Coal tar remains the principal source of commercial quinoline. [8] In 1842, French chemist Charles Gerhardt obtained a compound by dry distilling quinine, strychnine, or cinchonine with potassium hydroxide; [4] he called the compound Chinoilin or Chinolein. [9] Runge's and Gephardt's compounds seemed to be distinct isomers because they reacted differently. However, the German chemist August Hoffmann eventually recognized that the differences in behaviors was due to the presence of contaminants and that the two compounds were actually identical. [10] The only report of quinoline as a natural product is from the Peruvian stick insect Oreophoetes peruana. They have a pair of thoracic glands from which they discharge a malodorous fluid containing quinoline when disturbed. [11]

Like other nitrogen heterocyclic compounds, such as pyridine derivatives, quinoline is often reported as an environmental contaminant associated with facilities processing oil shale or coal, and has also been found at legacy wood treatment sites. Owing to its relatively high solubility in water quinoline has significant potential for mobility in the environment, which may promote water contamination. Quinoline is readily degradable by certain microorganisms, such as Rhodococcus species Strain Q1, which was isolated from soil and paper mill sludge. [12]

Quinolines are present in small amounts in crude oil within the virgin diesel fraction. It can be removed by the process called hydrodenitrification.

Synthesis

Quinolines are often synthesized from simple anilines using a number of named reactions.

Quinoline from aniline.png

Going clockwise from top these are:

A number of other processes exist, which require specifically substituted anilines or related compounds:

Quinolines are reduced to tetrahydroquinolines enantioselectively using several catalyst systems. [13] [14]

ImineScope8.png

Applications

Quinolines are used in the manufacture of dyes and the preparation of hydroxyquinoline sulfate and niacin. It is also used as a solvent for resins and terpenes.

Quinoline is mainly used as in the production of other specialty chemicals. Approximately 4 tonnes were produced annually according to a report published in 2005. [8] Its principal use is as a precursor to 8-hydroxyquinoline, which is a versatile chelating agent and precursor to pesticides. Its 2- and 4-methyl derivatives are precursors to cyanine dyes. Oxidation of quinoline affords quinolinic acid (pyridine-2,3-dicarboxylic acid), a precursor to the herbicide sold under the name "Assert". [8]

The reduction of quinoline with sodium borohydride in the presence of acetic acid is known to produce Kairoline A. [15] (C.f. Kairine)

Several anti-malarial drugs contain quinoline substituents. These include quinine, chloroquine, amodiaquine, and primaquine.

Quinoline is used as a solvent and reagent in organic synthesis. [16]

Quinolinium compounds (e.g. salts) can also be used as corrosion inhibitors and intensifiers.

See also

Related Research Articles

<span class="mw-page-title-main">Alkaloid</span> Class of naturally occurring chemical compounds

Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure may also be termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen or sulfur. More rarely still, they may contain elements such as phosphorus, chlorine, and bromine.

<span class="mw-page-title-main">Heterocyclic compound</span> Molecule with one or more rings composed of different elements

A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). Heterocyclic organic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of organic heterocycles.

<span class="mw-page-title-main">Pyridine</span> Heterocyclic aromatic organic compound

Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom (=N−). It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like smell. Pyridine is colorless, but older or impure samples can appear yellow, due to the formation of extended, unsaturated polymeric chains, which show significant electrical conductivity. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Historically, pyridine was produced from coal tar. As of 2016, it is synthesized on the scale of about 20,000 tons per year worldwide.

Pyrrole is a heterocyclic, aromatic, organic compound, a five-membered ring with the formula C4H4NH. It is a colorless volatile liquid that darkens readily upon exposure to air. Substituted derivatives are also called pyrroles, e.g., N-methylpyrrole, C4H4NCH3. Porphobilinogen, a trisubstituted pyrrole, is the biosynthetic precursor to many natural products such as heme.

<span class="mw-page-title-main">Aniline</span> Organic compound (C₆H₅NH₂); simplest aromatic amine

Aniline is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine. It is an industrially significant commodity chemical, as well as a versatile starting material for fine chemical synthesis. Its main use is in the manufacture of precursors to polyurethane, dyes, and other industrial chemicals. Like most volatile amines, it has the odor of rotten fish. It ignites readily, burning with a smoky flame characteristic of aromatic compounds. It is toxic to humans.

<span class="mw-page-title-main">Schiff base</span> Organic compound containing the group >C=N–

In organic chemistry, a Schiff base is a compound with the general structure R1R2C=NR3. They can be considered a sub-class of imines, being either secondary ketimines or secondary aldimines depending on their structure. Anil refers to a common subset of Schiff bases: imines derived from anilines. The term can be synonymous with azomethine which refers specifically to secondary aldimines.

<span class="mw-page-title-main">August Wilhelm von Hofmann</span> German chemist (1818–1892)

August Wilhelm von Hofmann was a German chemist who made considerable contributions to organic chemistry. His research on aniline helped lay the basis of the aniline-dye industry, and his research on coal tar laid the groundwork for his student Charles Mansfield's practical methods for extracting benzene and toluene and converting them into nitro compounds and amines. Hofmann's discoveries include formaldehyde, hydrazobenzene, the isonitriles, and allyl alcohol. He prepared three ethylamines and tetraethylammonium compounds and established their structural relationship to ammonia.

<span class="mw-page-title-main">Isoquinoline</span> Chemical compound

Isoquinoline is an individual chemical specimen - a heterocyclic aromatic organic compound - as well as the name of a family of many thousands of natural plant alkaloids, any one of which might be referred to as "an isoquinoline". It is a structural isomer of quinoline. Isoquinoline and quinoline are benzopyridines, which are composed of a benzene ring fused to a pyridine ring. In a broader sense, the term isoquinoline is used to make reference to isoquinoline derivatives. 1-Benzylisoquinoline is the structural backbone in many naturally occurring alkaloids such as papaverine. The isoquinoline ring in these natural compound derives from the aromatic amino acid tyrosine.

<span class="mw-page-title-main">Acetyl chloride</span> Organic compound (CH₃COCl)

Acetyl chloride is an acyl chloride derived from acetic acid. It belongs to the class of organic compounds called acid halides. It is a colorless, corrosive, volatile liquid. Its formula is commonly abbreviated to AcCl.

The Feist–Benary synthesis is an organic reaction between α-halo ketones and β-dicarbonyl compounds to produce substituted furan compounds. This condensation reaction is catalyzed by amines such as ammonia and pyridine. The first step in the ring synthesis is related to the Knoevenagel condensation. In the second step the enolate displaces an alkyl halogen in a nucleophilic aliphatic substitution.

<span class="mw-page-title-main">Phosphorus pentasulfide</span> Chemical compound

Phosphorus pentasulfide is the inorganic compound with the formula P2S5 (empirical) or P4S10 (molecular). This yellow solid is the one of two phosphorus sulfides of commercial value. Samples often appear greenish-gray due to impurities. It is soluble in carbon disulfide but reacts with many other solvents such as alcohols, DMSO, and DMF.

<span class="mw-page-title-main">Doebner–Miller reaction</span>

The Doebner–Miller reaction is the organic reaction of an aniline with α,β-unsaturated carbonyl compounds to form quinolines.

The Conrad–Limpach synthesis is the condensation of anilines (1) with β-ketoesters (2) to form 4-hydroxyquinolines (4) via a Schiff base (3). The overall reaction type is a combination of both an addition reaction as well as a rearrangement reaction. This reaction was discovered by Max Conrad (1848–1920) and Leonhard Limpach (1852–1933) in 1887 while they were studying the synthesis of quinoline derivatives.

The Combes quinoline synthesis is a chemical reaction, which was first reported by Combes in 1888. Further studies and reviews of the Combes quinoline synthesis and its variations have been published by Alyamkina et al., Bergstrom and Franklin, Born, and Johnson and Mathews.

Picoline refers to any of three isomers of methylpyridine (CH3C5H4N). They are all colorless liquids with a characteristic smell similar to that of pyridine. They are miscible with water and most organic solvents.

<span class="mw-page-title-main">Doebner reaction</span>

The Doebner reaction is the chemical reaction of an aniline with an aldehyde and pyruvic acid to form quinoline-4-carboxylic acids.

The Pfitzinger reaction is the chemical reaction of isatin with base and a carbonyl compound to yield substituted quinoline-4-carboxylic acids.

<span class="mw-page-title-main">Knorr quinoline synthesis</span>

The Knorr quinoline synthesis is an intramolecular organic reaction converting a β-ketoanilide to a 2-hydroxyquinoline using sulfuric acid. This reaction was first described by Ludwig Knorr (1859–1921) in 1886

<span class="mw-page-title-main">Gould–Jacobs reaction</span> Gould-Jacobs reaction explained

The Gould–Jacobs reaction is an organic synthesis for the preparation of quinolines and 4‐hydroxyquinoline derivatives. The Gould–Jacobs reaction is a series of reactions. The series of reactions begins with the condensation/substitution of an aniline with alkoxy methylenemalonic ester or acyl malonic ester, producing anilidomethylenemalonic ester. Then through a 6 electron cyclization process, 4-hydroxy-3-carboalkoxyquinoline is formed, which exist mostly in the 4-oxo form. Saponification results in the formation of an acid. This step is followed by decarboxylation to give 4-hydroxyquinoline. The Gould–Jacobs reaction is effective for anilines with electron‐donating groups at the meta‐position.

<span class="mw-page-title-main">Indole</span> Chemical compound

Indole is an organic compound with the formula C6H4CCNH3. Indole is classified as an aromatic heterocycle. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered pyrrole ring. Indoles are derivatives of indole where one or more of the hydrogen atoms have been replaced by substituent groups. Indoles are widely distributed in nature, most notably as amino acid tryptophan and neurotransmitter serotonin.

References

  1. "QUINOLINE (BENZOPYRIDINE)". Chemicalland21.com. Retrieved 2012-06-14.
  2. Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. pp. 4, 211. doi:10.1039/9781849733069-FP001 (inactive 2024-06-30). ISBN   978-0-85404-182-4. The name 'quinoline' is a retained name that is preferred to the alternative systematic fusion names '1-benzopyridine' or 'benzo[b]pyridine'.{{cite book}}: CS1 maint: DOI inactive as of June 2024 (link)
  3. Brown, H.C., et al., in Baude, E.A. and Nachod, F.C., Determination of Organic Structures by Physical Methods, Academic Press, New York, 1955.
  4. 1 2 3 Chisholm, Hugh, ed. (1911). "Quinoline"  . Encyclopædia Britannica . Vol. 22 (11th ed.). Cambridge University Press. p. 759.
  5. Shang, XF; Morris-Natschke, SL; Liu, YQ; Guo, X; Xu, XS; Goto, M; Li, JC; Yang, GZ; Lee, KH (May 2018). "Biologically active quinoline and quinazoline alkaloids part I." Medicinal Research Reviews. 38 (3): 775–828. doi:10.1002/med.21466. PMC   6421866 . PMID   28902434.
  6. Shang, Xiao-Fei; Morris-Natschke, Susan L.; Yang, Guan-Zhou; Liu, Ying-Qian; Guo, Xiao; Xu, Xiao-Shan; Goto, Masuo; Li, Jun-Cai; Zhang, Ji-Yu; Lee, Kuo-Hsiung (September 2018). "Biologically active quinoline and quinazoline alkaloids part II". Medicinal Research Reviews. 38 (5): 1614–1660. doi:10.1002/med.21492. PMC   6105521 . PMID   29485730.
  7. F. F. Runge (1834) "Ueber einige Produkte der Steinkohlendestillation" (On some products of coal distillation), Annalen der Physik und Chemie, 31 (5) : 65–78; see especially p. 68: "3. Leukol oder Weissöl" (3. White oil [in Greek] or white oil [in German]). From p. 68: "Diese dritte Basis habe ich Leukol oder Weissöl genannt, weil sie keine farbigen Reactionen zeigt." (This third base I've named leukol or white oil because it shows no color reactions.)
  8. 1 2 3 Gerd Collin; Hartmut Höke. "Quinoline and Isoquinoline". Ullmann's Encyclopedia of Industrial Chemistry . Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_465. ISBN   978-3527306732.
  9. Gerhardt, Ch. (1842) "Untersuchungen über die organischen Basen" (Investigations of organic bases), Annalen der Chemie und Pharmacie, 42 : 310-313. See also: (Editor) (1842) "Chinolein oder Chinoilin" (Quinoline or quinoilin), Annalen der Chemie und Pharmacie, 44 : 279-280.
  10. Initially, Hoffmann thought that Runge's Leukol and Gerhardt's Chinolein were distinct. (See: Hoffmann, August Wilhelm (1843) "Chemische Untersuchungen der organischen Basen im Steinkohlen-Theeröl" (Chemical investigations of organic bases in coal tar oil), Annalen der Chemie und Pharmacie, 47 : 37-87; see especially pp. 76-78.) However, after further purification of his Leukol sample, Hoffmann determined that the two were indeed identical. (See: (Editor) (1845) "Vorläufige Notiz über die Identität des Leukols und Chinolins" (Preliminary notice of the identity of leukol and quinoline), Annalen der Chemie und Pharmacie, 53 : 427-428.)
  11. Eisner, T; Morgan, R.C.; Attygalle A.B., Smedley, S.R.; Herath, K.B., Meinwald, J. (1997) “Defensive Production of quinoline by a phasmid insect (Oreophoetes peruana) J. Exp. Biol. 200, 2493–2500.
  12. O'Loughlin, Edward J.; Kehrmeyer, Staci R.; Sims, Gerald K. (1996). "Isolation, characterization, and substrate utilization of a quinoline-degrading bacterium". International Biodeterioration & Biodegradation. 38 (2): 107. Bibcode:1996IBiBi..38..107O. doi:10.1016/S0964-8305(96)00032-7.
  13. Xu, L.; Lam, K. H.; Ji, J.; Wu, J.; Fan, Q.-H.; Lo, W.-H.; Chan, A. S. C. Chem. Commun.2005, 1390.
  14. Reetz, M. T.; Li, X. Chem. Commun.2006, 2159.
  15. GRIBBLE, Gordon W.; HEALD, Peter W. (1975). "Reactions of Sodium Borohydride in Acidic Media; III. Reduction and Alkylation of Quinoline and Isoquinoline with Carboxylic Acids". Synthesis. 1975 (10): 650–652. doi:10.1055/s-1975-23871. ISSN   0039-7881.
  16. Sherman, Angela R.; Caron, Antoine; Collins, Shawn K. (2001). "Quinoline". Encyclopedia of Reagents for Organic Synthesis. pp. 1–4. doi:10.1002/047084289X.rq002.pub2. ISBN   9780470842898.