Tropone

Tropone[1] | Structure of tropone | Space-filling model of tropone

|

Names
Preferred IUPAC name

Cyclohepta-2,4,6-trien-1-one

Other names

Cyclohepta-2,4,6-trienone

Identifiers

CAS Number

* 539-80-0 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 10419 Y

ECHA InfoCard | 100.007.933

PubChem CID

* 10881

UNII |

* CO48X7SUFH Y

CompTox Dashboard (EPA)

* DTXSID60202169

InChI

* InChI=1S/C7H6O/c8-7-5-3-1-2-4-6-7/h1-6H Y

Key: QVWDCTQRORVHHT-UHFFFAOYSA-N Y

* InChI=1/C7H6O/c8-7-5-3-1-2-4-6-7/h1-6H

Key: QVWDCTQRORVHHT-UHFFFAOYAM

SMILES

* O=C\1/C=C\C=C/C=C/1

Properties

Chemical formula

| C7H6O
Molar mass | 106.12 g/mol
Density | 1.094 g/mL
Boiling point | 113 °C (235 °F; 386 K) (15 mmHg)
Hazards
Flash point | > 113 °C (235 °F; 386 K)

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)

Infobox references

Chemical compound

Tropone or 2,4,6-cycloheptatrien-1-one is an organic compound with some importance in organic chemistry as a non-benzenoid aromatic.[2] The compound consists of a ring of seven carbon atoms with three conjugated alkene groups and a ketone group. The related compound tropolone (2-hydroxy-2,4,6-cycloheptatrien-1-one) has an additional alcohol (or an enol including the double bond) group next to the ketone. Tropones are uncommon in natural products, with the notable exception of the 2-hydroxyl derivatives, which are called tropolones.

Tropone has been known since 1951 and is also called cycloheptatrienylium oxide. The name tropolone was coined by M. J. S. Dewar in 1945 in connection to perceived aromatic properties.[3]

## Properties

[edit]

Dewar in 1945 proposed that tropones could have aromatic properties. The carbonyl group is more polarized as a result of the triene ring, giving a partial positive charge on the carbon atom (A) and a partial negative charge on oxygen. In an extreme case, the carbon atom has a full positive charge (B) forming a tropylium ion ring which is an aromatic 6 electron system (C).

Tropone structures

Tropones are also basic (D) as a result of the aromatic stabilization. This property can be observed in the ease of salt formation with acids. The dipole moment for tropone is 4.17 D compared to a value of only 3.04 D for cycloheptanone. This difference is consistent with stabilization of the dipolar resonance structure.

## Synthesis

[edit]

Numerous methods exist for the organic synthesis of tropones and its derivatives. Two selected methods for the synthesis of tropone are by selenium dioxide oxidation of cycloheptatriene[4] and indirectly from tropinone by a Hofmann elimination and a bromination.[2]

Tropone synthesis

## Reactions

[edit]

Tropone undergoes ring contraction to benzoic acid with potassium hydroxide at elevated temperature. Many derivatives also contract to the corresponding arenes.[2] Tropone reacts in electrophilic substitution, for instance with bromine, but the reaction proceeds through the 1,2-addition product and is not an electrophilic aromatic substitution.[2]

Tropone derivatives also react in nucleophilic substitution very much like in nucleophilic aromatic substitution.[2]

Tropone is also found to react in an [8+3]annulation with a cinnamic aldehyde[5]

### Diene character

[edit]

Tropone behaves as a diene in a Diels-Alder reactions, for instance with maleic anhydride.[2] Similarly, it forms adducts with iron tricarbonyl, akin to (butadiene)iron tricarbonyl.[6]

## Derivatives

[edit]

Name  | Chemical structure  | Natural sources

|
|

Tropolone |  | Pseudomonas lindbergii, Pseudomonas plantarii[7]
Hinokitiol |  | Cupressaceae trees[8]
Stipitatic acid |  | Talaromyces stipitatus[9]
Tropodithietic acid |  | Phaeobacter piscinae, Phaeobacter inhibens, Phaeobacter gallaeciensis[10][11]
Colchicine |  | Colchicum autumnale, Gloriosa superba[12]

Other tropone derivatives include puberulonic and puberulic acids, roseobacticides, pernambucone, crototropone, orobanone.[13][14][15][16][17]

## References

[edit]

1. ^ Tropone at Sigma-Aldrich
2. ^ a b c d e f Pauson, Peter L. (1955). "Tropones and Tropolones". Chem. Rev. 55 (1): 9–136\. doi:10.1021/cr50001a002.
3. ^ M. J. S. Dewar (1945). "Structure of Stipitatic Acid". Nature. 155 (3924): 50–51\. Bibcode:1945Natur.155...50D. doi:10.1038/155050b0. S2CID 4086209.
4. ^ Dahnke, Karl R.; Paquette, Leo A. (1993). "Inverse Electron-Demand Diels-Alder Cycloaddition of a Ketene Dithioacetal. Copper Hydride-Promoted Reduction of a Conjugated Enone. 9-Dithiolanobicyclo[3.2.2]non-6-en-2-one". Org. Synth. 71: 181. doi:10.15227/orgsyn.071.0181.
5. ^ An N-Heterocyclic Carbene-Catalyzed [8 + 3] Annulation of Tropone and Enals via Homoenolate Vijay Nair, Manojkumar Poonoth, Sreekumar Vellalath, Eringathodi Suresh, and Rajasekaran Thirumalai J. Org. Chem.; 2006; 71(23) pp 8964 - 8965; (Note) doi:10.1021/jo0615706
6. ^ Dodge, R. P. (1964). "The Crystal and Molecular Structure of Tropone Iron Tricarbonyl". Journal of the American Chemical Society. 86 (24): 5429–5431\. doi:10.1021/ja01078a013.
7. ^ Liu, Na; Song, Wangze; Schienebeck, Casi M.; Zhang, Min; Tang, Weiping (December 2014). "Synthesis of naturally occurring tropones and tropolones". Tetrahedron. 70 (49): 9281–9305\. doi:10.1016/j.tet.2014.07.065. PMC 4228802. PMID 25400298.
8. ^ Saniewski, Marian; Horbowicz, Marcin; Kanlayanarat, Sirichai (10 September 2014). "The Biological Activities of Troponoids and Their Use in Agriculture A Review". Journal of Horticultural Research. 22 (1): 5–19\. doi:10.2478/johr-2014-0001.
9. ^ Davison, J.; al Fahad, A.; Cai, M.; Song, Z.; Yehia, S. Y.; Lazarus, C. M.; Bailey, A. M.; Simpson, T. J.; Cox, R. J. (15 May 2012). "Genetic, molecular, and biochemical basis of fungal tropolone biosynthesis". Proceedings of the National Academy of Sciences. 109 (20): 7642–7647\. doi:10.1073/pnas.1201469109. PMC 3356636. PMID 22508998.
10. ^ Rabe, Patrick; Klapschinski, Tim A; Brock, Nelson L; Citron, Christian A; D’Alvise, Paul; Gram, Lone; Dickschat, Jeroen S (6 August 2014). "Synthesis and bioactivity of analogues of the marine antibiotic tropodithietic acid". Beilstein Journal of Organic Chemistry. 10: 1796–1801\. doi:10.3762/bjoc.10.188. PMC 4142847. PMID 25161739.
11. ^ Beyersmann, Paul G.; Tomasch, Jürgen; Son, Kwangmin; Stocker, Roman; Göker, Markus; Wagner-Döbler, Irene; Simon, Meinhard; Brinkhoff, Thorsten (December 2017). "Dual function of tropodithietic acid as antibiotic and signaling molecule in global gene regulation of the probiotic bacterium Phaeobacter inhibens". Scientific Reports. 7 (1): 730. Bibcode:2017NatSR...7..730B. doi:10.1038/s41598-017-00784-7. PMC 5429656. PMID 28389641.
12. ^ Keith, Michael P.; Gilliland, William R.; Uhl, Kathleen (2009). "GOUT". Pharmacology and Therapeutics: 1039–1046\. doi:10.1016/B978-1-4160-3291-5.50079-2. ISBN 978-1-4160-3291-5.
13. ^ Thiel, Verena; Brinkhoff, Thorsten; Dickschat, Jeroen S.; Wickel, Susanne; Grunenberg, Jörg; Wagner-Döbler, Irene; Simon, Meinhard; Schulz, Stefan (10 December 2009). "Identification and biosynthesis of tropone derivatives and sulfur volatiles produced by bacteria of the marine Roseobacter clade". Organic & Biomolecular Chemistry. 8 (1): 234–246\. doi:10.1039/B909133E. PMID 20024154.
14. ^ Duan, Ying; Petzold, Melanie; Saleem-Batcha, Raspudin; Teufel, Robin (September 2020). "Bacterial Tropone Natural Products and Derivatives: Overview of their Biosynthesis, Bioactivities, Ecological Role and Biotechnological Potential". ChemBioChem. 21 (17): 2384–2407\. doi:10.1002/cbic.201900786. PMC 7497051. PMID 32239689.
15. ^ Randau, K. P.; Sproll, S.; Lerche, H.; Bracher, F. (1 May 2009). "Pernambucone, a new tropone derivative from Croton argyroglossum". Die Pharmazie. 64 (5): 350–351\. doi:10.1691/ph.2009.7592. PMID 19530449.
16. ^ Bracher, Franz; Randau, Karina P.; Lerche, Holger (1 April 2008). "Crototropone, a new tropone derivative from Croton zehntneri". Fitoterapia. 79 (3): 236–237\. doi:10.1016/j.fitote.2007.12.001. PMID 18321658.
17. ^ Fruchier, Alain; Rascol, Jean-Pierre; Andary, Claude; Privatt, Guy (1 January 1981). "A tropone derivative from orobanche rapum-genistae". Phytochemistry. 20 (4): 777–779\. Bibcode:1981PChem..20..777F. doi:10.1016/0031-9422(81)85173-4.

* v
* t
* e

Pharmacology: enzyme inhibition

Class|

* Competitive inhibition
* Uncompetitive inhibition
* Non-competitive inhibition
* Suicide inhibition
* Mixed inhibition

Substrate|

| Oxidoreductase (EC 1)|

* 1.1 Aldose reductase
* HMG-CoA reductase

* 1.3 5α-Reductase

* 1.4 Monoamine oxidase

* 1.5 Dihydrofolate reductase

* 1.13 Lipoxygenase

* 1.14 Aromatase
* COX-2

* 1.17 Xanthine oxidase
* Ribonucleotide reductase

|

Transferase (EC 2)|

* 2.1 COMT
* Thymidylate synthase

* 2.4 PARP

* 2.5 Dihydropteroate synthetase
* Farnesyltransferase

* 2.6 GABA transaminase

* 2.7 Nucleotidyltransferase
* Integrase
* Reverse transcriptase
* Protein kinase
* Tyrosine kinase
* Janus kinase

Hydrolase (EC 3)|

* 3.1 Phosphodiesterase
* Acetylcholinesterase
* Ribonuclease

* 3.2 Polygalacturonase
* Neuraminidase
* Alpha-glucosidase

* 3.4 Protease: Exopeptidase
* DPP-4
* ACE
* Endopeptidase
* Trypsin
* Renin
* Mixed
* Enkephalinase
* Matrix metalloproteinase
* Oxytocinase

* 3.5 Histone deacetylase
* Beta-lactamase

Lyase (EC 4)|

* 4.1 Dopa decarboxylase

* 4.2 Carbonic anhydrase

Miscellaneous|

* Steroidogenesis inhibitor

* v
* t
* e

Dopamine receptor modulators

D1-like|

| Agonists|

* Benzazepines: 6-Br-APB
* Fenoldopam
* SKF-38,393
* SKF-77,434
* SKF-81,297
* SKF-82,958
* SKF-83,959
* Trepipam
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* Ergolines: Cabergoline
* CY-208,243
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* Dihydrexidine derivatives: A-77636
* A-86929
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* Dihydrexidine
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* Phenethylamines: BCO-001
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* XP21279

* Others: A-68930
* Apomorphine
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* PF-6649751
* PF 6669571
* Propylnorapomorphine
* Rotigotine
* SKF-89,145
* SKF-89,626
* Stepholidine
* Tavapadon
* Tetrahydropalmatine

|

PAMs|

* Tetrahydroisoquinolines: DETQ
* DPTQ
* Mevidalen

Antagonists|

* Typical antipsychotics: Butaclamol
* Chlorpromazine
* Chlorprothixene
* Flupentixol (flupenthixol) (+melitracen)
* Fluphenazine
* Loxapine
* Perphenazine (+amitriptyline)
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* Atypical antipsychotics: Asenapine
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* Others: Berupipam
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* SCH-23390

D2-like|

| Agonists|

* Adamantanes: Amantadine
* Memantine
* Rimantadine

* Aminotetralins: 5-OH-DPAT
* 7-OH-DPAT
* 8-OH-PBZI
* CHF-1024
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* Ergolines: Bromocriptine
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* Dihydrexidine derivatives: 2-OH-NPA
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* Phenethylamines: Deoxyepinephrine (N-methyldopamine, epinine)
* Dopexamine
* Etilevodopa
* Ibopamine
* L-DOPA (levodopa)
* L-Phenylalanine
* L-Tyrosine
* Melevodopa
* XP21279

* Atypical antipsychotics: Alentemol (U-66444B)
* Aripiprazole (+sertraline)
* Aripiprazole lauroxil
* Bifeprunox
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* Brilaroxazine
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* Others: 3-PPP
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* SKF-83,959
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* Umespirone
* WAY-100,635

|

Antagonists|

* Typical antipsychotics: Acepromazine
* Acetophenazine
* Azaperone
* Benperidol
* Bromperidol
* Butaclamol
* Butaperazine
* Chloracizine
* Chlorproethazine
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* Levosulpiride
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* Piflutixol (pifluthixol)
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* Sulforidazine
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* Sultopride
* Teflutixol
* Thiopropazate
* Thioproperazine
* Thioridazine
* Thiothixene
* Timiperone
* Trifluoperazine (+tranylcypromine)
* Triflupromazine
* Trifluperidol
* Zetidoline
* Zuclopenthixol

* Atypical antipsychotics: Amisulpride
* Asenapine
* BL-1020
* Blonanserin
* Carpipramine
* Cinuperone
* Clocapramine
* Clorotepine
* Clotiapine (clothiapine)
* Clozapine
* Cyamemazine
* DHA-clozapine
* Dixyrazine
* Elopiprazole
* Flumezapine
* Fluperlapine
* Gevotroline
* Iloperidone
* Lurasidone
* Mazapertine
* Melperone
* Molindone
* Mosapramine
* Ocaperidone
* Olanzapine (+fluoxetine)
* Paliperidone
* Perospirone
* Piperacetazine
* Pipotiazine
* Piquindone
* Quetiapine
* Remoxipride
* Risperidone
* Sertindole
* Tefludazine
* Tenilapine
* Tiospirone
* Veralipride
* Zicronapine
* Ziprasidone
* Zotepine

* Antiemetics/gastroprokinetics/sedatives: Aceprometazine
* AS-8112
* Alimemazine
* Alizapride
* Benzquinamide
* Bromopride
* Clebopride
* Deudomperidone
* Domperidone
* Eticlopride
* Hydroxyzine
* Itopride
* Metoclopramide
* Metopimazine
* Promethazine
* Thiethylperazine
* Trazpiroben
* Trimethobenzamide

* Antidepressants: Amoxapine
* Nefazodone
* Opipramol
* Propiomazine
* Trimipramine

* Others: 3-PPP
* Alpiropride
* Azapride
* Bromerguride
* Bromocriptine
* Buspirone
* Carmoxirole
* Desmethoxyfallypride
* EEDQ
* F-15063
* Fallypride
* Fananserin
* Fenfluramine
* Iodobenzamide
* Isocorypalmine
* L-741,626
* L-745,870
* Levofenfluramine
* LEK-8829
* Metitepine (methiothepin)
* N-Methylspiperone
* Nafadotride
* Nuciferine
* PNU-99,194
* Pridopidine
* Raclopride
* Sarizotan
* SB-277,011-A
* Seridopidine
* Sonepiprazole
* Spiroxatrine
* Stepholidine
* SV-293
* Tetrahydropalmatine
* Tiapride
* UH-232
* Yohimbine

* See also: Receptor/signaling modulators
* Adrenergics
* Serotonergics
* Monoamine reuptake inhibitors
* Monoamine releasing agents
* Monoamine metabolism modulators
* Monoamine neurotoxins

* v
* t
* e

Simple aromatic rings

1 ring|

| Three-membered|

* Borirene
* Cyclopropenone

|

Five-membered|

* Furan
* Pyrrole
* Imidazole
* Thiophene
* Phosphole
* Pyrazole
* Oxazole
* Isoxazole
* Thiazole
* Isothiazole
* Triazole
* Tetrazole
* Pentazole

Six-membered|

* Benzene
* Pyridine
* Pyrazine
* Pyrimidine
* Pyridazine
* Triazine
* Tetrazine
* Pentazine
* Hexazine

Seven-membered|

* Borepin
* Tropone

Nine-membered|

* Azonine

18-membered|

* Cyclooctadecanonaene

2 rings|

| Five + Five|

* Diazapentalene
* Thienothiophene
* Trithiapentalene

|

Five + Six|

* Benzofuran
* Isobenzofuran
* Indole
* Isoindole
* Benzothiophene
* Benzo(c)thiophene
* Benzophosphole
* Benzimidazole
* Purine
* Indazole
* Benzoxazole
* Benzisoxazole
* Benzothiazole
* 5-Aza-7-deazapurine

Six + Six|

* Naphthalene
* Quinoline
* Isoquinoline
* Quinoxaline
* Quinazoline
* Cinnoline
* Phthalazine

Five + Seven|

* Azulene

Authority control databases: National |

* Germany

|

*[CID]: Compound ID
*[EPA]: U.S. Environmental Protection Agency
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template
*[PAMs]: Positive allosteric modulators