Borneol

Borneol is a bicyclic organic compound and a terpene derivative. The hydroxyl group in this compound is placed in an endo position. The exo diastereomer is called isoborneol. Being chiral, borneol exists as enantiomers, both of which are found in nature: d-borneol (also written (+)-borneol, dextroborneol, dexborneol) and l-borneol (or (−)-borneol, levoborneol).

Both borneol and isoborneol belong to the category of 2-bornanol, a derivative of bornane. Some sources such as PubChem and CHEBI use the term borneol to refer to the entire category of 2-bornanols while others such as KEGG use the term borneol to refer to the compounds with endo hydroxyl only.

## Contents

* 1 Reactions
* 2 Occurrence
* 2.1 Synthesis
* 2.2 Natural sources
* 2.3 Biosynthesis
* 3 Uses
* 3.1 Medical uses
* 3.2 Folk medicine
* 4 Toxicology
* 4.1 Skin irritation
* 5 Derivatives
* 6 Notes and references
* 7 External links

## Reactions

Borneol is oxidized to the ketone camphor.

## Occurrence

The compound was identified and named camphre de Bornéo, or Borneo camphor in 1842 by the French chemist Charles Frédéric Gerhardt.[1] Borneol can be found in several species of Heterotheca,[2] Artemisia, Rosmarinus officinalis (rosemary),[3] Dryobalanops aromatica, Blumea balsamifera and Kaempferia galanga.[4]

It is one of the chemical compounds found in castoreum. This compound is gathered from the beaver's plant food.[5]

### Synthesis

Borneol can be synthesized by reduction of camphor by the Meerwein–Ponndorf–Verley reduction (a reversible process). For flavoring purposes, a racemic mixture of camphor is used as starting material, leading to a racemic mixture of borneol and isoborneol. The chirality can be controlled by changing the chirality of camphor: (+)-camphor gives (−)-isoborneol and (+)-borneol.[6]

Reduction of camphor with sodium borohydride (fast and irreversible) gives instead the diastereomer isoborneol.

### Natural sources

Borneol is a component of many essential oils.[7]

Industrially, natural (+)-borneol is produced from Cinnamomum burmanni (one specific chemotype)[8] and Cinnamomum camphora.[9][10]

Natural (-)-borneol occurs in Blumea balsamifera.[10]

### Biosynthesis

Borneol is synthesized using DMAPP as the starting material. DMAPP is then converted to GPP, which is acted upon by a bornyl diphosphate synthase to yield a bornyl diphosphate. A phosphatase then removes the phosphate groups, yielding borneol.[11]

The chirality of borneol in a plant depends on the preferred chirality of the bornyl diphosphate synthase. Synthases for either chirality have been sequenced.[11][12]

A downstream product is camphor of either chirality, a reaction catalyzed by (+)-borneol dehydrogenase or (−)-borneol dehydrogenase.

## Uses

As mentioned above, both enantiomers of borneol occur in nature. Whereas d-borneol (+) was the enantiomer that used to be the most readily available commercially, the more commercially available enantiomer now is l-borneol (-).

Borneol generates a TRPM8-mediated cooling sensation similar to, but weaker than, menthol. It is more effective at activating TRPM8 at lower temperatures.[13]

Borneol is also a natural insect repellent.[14]

Laevo-borneol (-) is used in perfumery. It has a balsamic odour type with pine, woody and camphoraceous facets.

### Medical uses

Dextro-borneol (dexborneol) is used in edaravone/dexborneol, a drug approved in China for stroke. It is approved in intravenous (2021) and sublingual (2025) forms. The intravenous combination was approved on the basis of trials showing it to be superior to edavarone alone.[15][16]

### Folk medicine

(+)-Borneol (d-) from Dipterocarpus spp. is used in traditional Chinese medicine (TCM). An early description is found in the Bencao Gangmu.

Volume 1 of the modern Chinese Pharmacopoeia, which deals with TCM and modernized TCM, lists uses for both enantiomers as well as the synthetic racemer.[10]

Borneol is widely used in ophthalmic preparations in China, though little is known about its exact function.[13]

## Toxicology

Borneol may cause eye, skin, and respiratory irritation; it is harmful if swallowed.[17] Acute exposure may cause headache, nausea, vomiting, dizziness, lightheadedness, and syncope. Exposure to higher levels or over a longer period of time may cause restlessness, difficulty concentrating, irritability, and seizures.[18]

### Skin irritation

Borneol has been shown to have little to no irritation effect when applied to the human skin at doses used in fine fragrance formulation.[19] Skin exposure can lead to sensitization and a future allergic reaction even to small quantities.[18]

## Derivatives

The bornyl group is a univalent radical C10H17 derived from borneol by removal of hydroxyl and is also known as 2-bornyl.[20] Isobornyl is the univalent radical C10H17 that is derived from isoborneol.[21] Bornyl acetate is the acetate ester of borneol.

The norborneols are derived from borneol and isoborneol by the removal of methyl groups, analogous to the change from bornane to norbornane.

The epiborneols and isoepiborneols are analogously derived from epicamphor.[22]

The structural isomer fenchol is a widely used compound derived from certain essential oils.

## Notes and references

1. ↑ Gerhardt, C. (1842). "Sur la transformation de l'essence de valériane en camphre de Bornéo et en camphre des laurinées". Comptes rendus 14: 832–835.
From p. 834: "Je donne, par cette raison, à l'hydrogène carboné de l'essence de valériane, le nom de bornéène, et, au camphre lui-même, celui de bornéol." (I give, for this reason [namely, that the compound that Gerhardt had obtained from valerian oil was identical to that obtained by Pelouze from camphor from Borneo], to the hydrocarbon from valerian essence, the name bornéène, and, to camphor itself, that of borneol.)
2. ↑ Lincoln, D. E.; Lawrence, B. M. (1984). "The volatile constituents of camphorweed, Heterotheca subaxillaris". Phytochemistry 23 (4): 933–934. doi:10.1016/S0031-9422(00)85073-6. Bibcode: 1984PChem..23..933L.
3. ↑ Begum, A.; Sandhya, S.; Shaffath Ali, S.; Vinod, K. R.; Reddy, S.; Banji, D. (2013). "An in-depth review on the medicinal flora Rosmarinus officinalis (Lamiaceae)". Acta Scientiarum Polonorum: Technologia Alimentaria 12 (1): 61–73. PMID 24584866.
4. ↑ Wong, K. C.; Ong, K. S.; Lim, C. L. (2006). "Composition of the essential oil of rhizomes of Kaempferia galanga L.". Flavour and Fragrance Journal 7 (5): 263–266. doi:10.1002/ffj.2730070506.
5. ↑ The Beaver: Its Life and Impact. Dietland Muller-Schwarze, 2003, page 43 (book at google books)
6. ↑ Yang, Ming-Yeh; Khine, Aye Aye; Liu, Jen-Wei; Cheng, Hui-Chen; Hu, Anren; Chen, Hao-Ping; Shih, Tzenge-Lien (November 2018). "Resolution of isoborneol and its isomers by GC/MS to identify "synthetic" and "semi-synthetic" borneol products". Chirality 30 (11): 1233–1239. doi:10.1002/chir.23017. PMID 30222211.
7. ↑ Plants containing borneol (Dr. Duke's Phytochemical and Ethnobotanical Databases)]
8. ↑ Li, Fangping; Huang, Shilin; Mei, Yu; Wu, Bingqi; Hou, Zhuangwei; Zhan, Penglin; Hou, Zhihao; Huang, Wenjie et al. (October 2022). "Genome assembly provided new insights into the Cinnamomum burmannii evolution and D-borneol biosynthesis differences between chemotypes". Industrial Crops and Products 186. doi:10.1016/j.indcrop.2022.115181.
9. ↑ Xingxing, Liu; Xi, Zhang; Xiali, Guo; Shangji, Gong; Xiangmei, Jiang; Yuxin, Fu; Liping, Luo (2014). "Multivariate Analyses of Volatile Chemical Composition in Leaves of Different Cinnamomum camphora Chemotypes". Chinese Bulletin of Botany 49 (2): 161. doi:10.3724/SP.J.1259.2014.00161.
10. ↑ 10.0 10.1 10.2 中国药典第一部 (2020 ed.). 右旋 (+) 左旋 (-) 合成 (racemic synthetic)
11. ↑ 11.0 11.1 Ma, Rui; Su, Ping; Ma, Qing; Guo, Juan; Chen, Suiqing; Jin, Baolong; Zhang, Haiyan; Tang, Jinfu et al. (March 2022). "Identification of (−)-bornyl diphosphate synthase from Blumea balsamifera and its application for (−)-borneol biosynthesis in Saccharomyces cerevisiae". Synthetic and Systems Biotechnology 7 (1): 490–497. doi:10.1016/j.synbio.2021.12.004. PMID 34977393.
12. ↑ Yang, Zerui; An, Wenli; Liu, Shanshan; Huang, Yuying; Xie, Chunzhu; Huang, Song; Zheng, Xiasheng (10 June 2020). "Mining of candidate genes involved in the biosynthesis of dextrorotatory borneol in Cinnamomum burmannii by transcriptomic analysis on three chemotypes". PeerJ 8. doi:10.7717/peerj.9311. PMID 32566406.
13. ↑ 13.0 13.1 Chen, GL; Lei, M; Zhou, LP; Zeng, B; Zou, F (2016). "Borneol Is a TRPM8 Agonist that Increases Ocular Surface Wetness". PLOS ONE 11 (7). doi:10.1371/journal.pone.0158868. PMID 27448228. Bibcode: 2016PLoSO..1158868C.
14. ↑ "Chemical Information". sun.ars-grin.gov. http://sun.ars-grin.gov:8080/npgspub/xsql/duke/chemdisp.xsql?chemical=BORNEOL.
15. ↑ Xu, Jie; Wang, Anxin; Meng, Xia; Yalkun, Gulbahram; Xu, Anding; Gao, Zhiqiang; Chen, Huisheng; Ji, Yong et al. (March 2021). "Edaravone Dexborneol Versus Edaravone Alone for the Treatment of Acute Ischemic Stroke: A Phase III, Randomized, Double-Blind, Comparative Trial". Stroke 52 (3): 772–780. doi:10.1161/STROKEAHA.120.031197. PMID 33588596.
16. ↑ Fu, Yu; Wang, Anxin; Tang, Renhong; Li, Shuya; Tian, Xue; Xia, Xue; Ren, Jinsheng; Yang, Shibao et al. (1 April 2024). "Sublingual Edaravone Dexborneol for the Treatment of Acute Ischemic Stroke: The TASTE-SL Randomized Clinical Trial". JAMA Neurology 81 (4): 319. doi:10.1001/jamaneurol.2023.5716. PMID 38372981.
17. ↑ Material Safety Data Sheet. Fisher Scientific.
18. ↑ 18.0 18.1 HAZARDOUS SUBSTANCE FACT SHEET (PDF)
19. ↑ Bhatia, S.P.; Letizia, C.S.; Api, A.M. (November 2008). "Fragrance material review on borneol" (in en). Food and Chemical Toxicology 46 (11): S77–S80. doi:10.1016/j.fct.2008.06.031. PMID 18640181. https://linkinghub.elsevier.com/retrieve/pii/S0278691508003219.
20. ↑ "Definition of BORNYL". https://www.merriam-webster.com/dictionary/bornyl.
21. ↑ "Definition of ISOBORNYL". https://www.merriam-webster.com/dictionary/isobornyl.
22. ↑ Robertson, JS; Hussain, M (June 1969). "Metabolism of camphors and related compounds.". The Biochemical Journal 113 (1): 57–65. doi:10.1042/bj1130057. PMID 4308838.

## External links

* NIST datasheet including full spectroscopic data
* Borneol in Chinese medicine

* v
* t
* e

GABAA receptor positive modulators

Alcohols|

* Brometone
* Butanol
* Chloralodol
* Chlorobutanol (cloretone)
* Ethanol (alcohol) (alcoholic drink)
* Ethchlorvynol
* Isobutanol
* Isopropanol
* Menthol
* Methanol
* Methylpentynol
* Pentanol
* Petrichloral
* Propanol
* tert-Butanol (2M2P)
* tert-Pentanol (2M2B)
* Tribromoethanol
* Trichloroethanol
* Triclofos
* Trifluoroethanol

Barbiturates|

* (-)-DMBB
* Allobarbital
* Alphenal
* Amobarbital
* Aprobarbital
* Barbexaclone
* Barbital
* Benzobarbital
* Benzylbutylbarbiturate
* Brallobarbital
* Brophebarbital
* Butabarbital/Secbutabarbital
* Butalbital
* Buthalital
* Butobarbital
* Butallylonal
* Carbubarb
* Crotylbarbital
* Cyclobarbital
* Cyclopentobarbital
* Difebarbamate
* Enallylpropymal
* Ethallobarbital
* Eterobarb
* Febarbamate
* Heptabarb
* Heptobarbital
* Hexethal
* Hexobarbital
* Metharbital
* Methitural
* Methohexital
* Methylphenobarbital
* Narcobarbital
* Nealbarbital
* Pentobarbital
* Phenallymal
* Phenobarbital
* Phetharbital
* Primidone
* Probarbital
* Propallylonal
* Propylbarbital
* Proxibarbital
* Reposal
* Secobarbital
* Sigmodal
* Spirobarbital
* Talbutal
* Tetrabamate
* Tetrabarbital
* Thialbarbital
* Thiamylal
* Thiobarbital
* Thiobutabarbital
* Thiopental
* Thiotetrabarbital
* Valofane
* Vinbarbital
* Vinylbital

Benzodiazepines|

* 2-Oxoquazepam
* 3-Hydroxyphenazepam
* Adinazolam
* Alprazolam
* Arfendazam
* Avizafone
* Bentazepam
* Bretazenil
* Bromazepam
* Brotizolam
* Camazepam
* Carburazepam
* Chlordiazepoxide
* Ciclotizolam
* Cinazepam
* Cinolazepam
* Clazolam
* Climazolam
* Clobazam
* Clonazepam
* Clonazolam
* Cloniprazepam
* Clorazepate
* Clotiazepam
* Cloxazolam
* CP-1414S
* Cyprazepam
* Delorazepam
* Demoxepam
* Diazepam
* Diclazepam
* Doxefazepam
* Elfazepam
* Estazolam
* Ethyl carfluzepate
* Ethyl dirazepate
* Ethyl loflazepate
* Etizolam
* EVT-201
* FG-8205
* Fletazepam
* Flubromazepam
* Flubromazolam
* Fludiazepam
* Flunitrazepam
* Flunitrazolam
* Flurazepam
* Flutazolam
* Flutemazepam
* Flutoprazepam
* Fosazepam
* Gidazepam
* Halazepam
* Haloxazolam
* Iclazepam
* Imidazenil
* Irazepine
* Ketazolam
* Lofendazam
* Lopirazepam
* Loprazolam
* Lorazepam
* Lormetazepam
* Meclonazepam
* Medazepam
* Menitrazepam
* Metaclazepam
* Mexazolam
* Midazolam
* Motrazepam
* N-Desalkylflurazepam
* Nifoxipam
* Nimetazepam
* Nitrazepam
* Nitrazepate
* Nitrazolam
* Nordazepam
* Nortetrazepam
* Oxazepam
* Oxazolam
* Phenazepam
* Pinazepam
* Pivoxazepam
* Prazepam
* Premazepam
* Proflazepam
* Pyrazolam
* QH-II-66
* Quazepam
* Reclazepam
* Remimazolam
* Rilmazafone
* Ripazepam
* Ro48-6791
* Ro48-8684
* SH-053-R-CH3-2′F
* Sulazepam
* Temazepam
* Tetrazepam
* Tolufazepam
* Triazolam
* Triflubazam
* Triflunordazepam (Ro5-2904)
* Tuclazepam
* Uldazepam
* Zapizolam
* Zolazepam
* Zomebazam

Carbamates|

* Carisbamate
* Carisoprodol
* Clocental
* Cyclarbamate
* Difebarbamate
* Emylcamate
* Ethinamate
* Febarbamate
* Felbamate
* Hexapropymate
* Lorbamate
* Mebutamate
* Meprobamate
* Nisobamate
* Pentabamate
* Phenprobamate
* Procymate
* Styramate
* Tetrabamate
* Tybamate

Flavonoids|

* 6-Methylapigenin
* Ampelopsin (dihydromyricetin)
* Apigenin
* Baicalein
* Baicalin
* Catechin
* EGC
* EGCG
* Hispidulin
* Linarin
* Luteolin
* Rc-OMe
* Skullcap constituents (e.g., baicalin)
* Wogonin

Imidazoles|

* Etomidate
* Metomidate
* Propoxate

Kava constituents|

* 10-Methoxyyangonin
* 11-Methoxyyangonin
* 11-Hydroxyyangonin
* Desmethoxyyangonin
* 11-Methoxy-12-hydroxydehydrokavain
* 7,8-Dihydroyangonin
* Kavain
* 5-Hydroxykavain
* 5,6-Dihydroyangonin
* 7,8-Dihydrokavain
* 5,6,7,8-Tetrahydroyangonin
* 5,6-Dehydromethysticin
* Methysticin
* 7,8-Dihydromethysticin
* Yangonin

Monoureides|

* Acecarbromal
* Apronal (apronalide)
* Bromisoval
* Carbromal
* Capuride
* Ectylurea

Neuroactive steroids|

* Acebrochol
* Allopregnanolone (brexanolone)
* Alfadolone
* Alfaxalone
* 3α-Androstanediol
* Androstenol
* Androsterone
* Certain anabolic-androgenic steroids
* Cholesterol
* DHDOC
* 3α-DHP
* 5α-DHP
* 5β-DHP
* DHT
* Etiocholanolone
* Ganaxolone
* Hydroxydione
* Minaxolone
* ORG-20599
* ORG-21465
* P1-185
* Pregnanolone (eltanolone)
* Progesterone
* Renanolone
* SAGE-105
* SAGE-324
* SAGE-516
* SAGE-689
* SAGE-872
* Testosterone
* THDOC
* Zuranolone

Nonbenzodiazepines|

* Cyclopyrrolones: Eszopiclone
* Pagoclone
* Pazinaclone
* Suproclone
* Suriclone
* Zopiclone

* Imidazopyridines: Alpidem
* DS-1
* Necopidem
* Saripidem
* Zolpidem

* Pyrazolopyrimidines: Divaplon
* Fasiplon
* Indiplon
* Lorediplon
* Ocinaplon
* Panadiplon
* Taniplon
* Zaleplon

* Others: Adipiplon
* CGS-8216
* CGS-9896
* CGS-13767
* CGS-20625
* CL-218,872
* CP-615,003
* CTP-354
* ELB-139
* GBLD-345
* Imepitoin
* JM-1232
* L-838,417
* Lirequinil (Ro41-3696)
* NS-2664
* NS-2710
* NS-11394
* Pipequaline
* ROD-188
* RWJ-51204
* SB-205,384
* SX-3228
* TGSC01AA
* TP-003
* TPA-023
* TP-13
* U-89843A
* U-90042
* Viqualine
* Y-23684

Phenols|

* Fospropofol
* Propofol
* Thymol

Piperidinediones|

* Glutethimide
* Methyprylon
* Piperidione
* Pyrithyldione

Pyrazolopyridines|

* Cartazolate
* Etazolate
* ICI-190,622
* Tracazolate

Quinazolinones|

* Afloqualone
* Cloroqualone
* Diproqualone
* Etaqualone
* Mebroqualone
* Mecloqualone
* Methaqualone
* Methylmethaqualone
* Nitromethaqualone
* SL-164

Volatiles/gases|

* Acetone
* Acetophenone
* Acetylglycinamide chloral hydrate
* Aliflurane
* Benzene
* Butane
* Butylene
* Centalun
* Chloral
* Chloral betaine
* Chloral hydrate
* Chloroform
* Cryofluorane
* Desflurane
* Dichloralphenazone
* Dichloromethane
* Diethyl ether
* Enflurane
* Ethyl chloride
* Ethylene
* Fluroxene
* Gasoline
* Halopropane
* Halothane
* Isoflurane
* Kerosine
* Methoxyflurane
* Methoxypropane
* Nitric oxide
* Nitrogen
* Nitrous oxide
* Norflurane
* Paraldehyde
* Propane
* Propylene
* Roflurane
* Sevoflurane
* Synthane
* Teflurane
* Toluene
* Trichloroethane (methyl chloroform)
* Trichloroethylene
* Vinyl ether

Others/unsorted|

* 3-Hydroxybutanal
* α-EMTBL
* AA-29504
* Avermectins (e.g., ivermectin)
* Bromide compounds (e.g., lithium bromide, potassium bromide, sodium bromide)
* Carbamazepine
* Chloralose
* Chlormezanone
* Clomethiazole
* DEABL
* Dihydroergolines (e.g., dihydroergocryptine, dihydroergosine, dihydroergotamine, ergoloid (dihydroergotoxine))
* DS2
* Efavirenz
* Etazepine
* Etifoxine
* Fenamates (e.g., flufenamic acid, mefenamic acid, niflumic acid, tolfenamic acid)
* Fluoxetine
* Flupirtine
* Hopantenic acid
* Lanthanum
* Lavender oil
* Lignans (e.g., 4-O-methylhonokiol, honokiol, magnolol, obovatol)
* Loreclezole
* Menthyl isovalerate (validolum)
* Monastrol
* Niacin
* Nicotinamide (niacinamide)
* Org 25,435
* Phenytoin
* Propanidid
* Retigabine (ezogabine)
* Safranal
* Seproxetine
* Stiripentol
* Sulfonylalkanes (e.g., sulfonmethane (sulfonal), tetronal, trional)
* Terpenoids (e.g., borneol)
* Topiramate
* Valerian constituents (e.g., isovaleric acid, isovaleramide, valerenic acid, valerenol)

* Unsorted benzodiazepine site positive modulators: α-Pinene
* MRK-409 (MK-0343)
* TCS-1105
* TCS-1205

See also: Receptor/signaling modulators • GABA receptor modulators • GABA metabolism/transport modulators

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Borneol. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Borneol&oldid=4433323"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template
*[GABAA]: γ-Aminobutyric acid A