Chemistry:Tetrahydroisoquinoline

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Tetrahydroisoquinoline
Tetrahydroisoquinoline-structure.svg
Names
Preferred IUPAC name
1,2,3,4-Tetrahydroisoquinoline
Identifiers
3D model (JSmol)
Abbreviations TIQ, THIQ
ChEMBL
ChemSpider
EC Number
  • 202-050-0
RTECS number
  • NX4900000
UNII
Properties
C9H11N
Molar mass 133.19 g/mol
Appearance Deep yellow liquid
Density 1.05 g/mL
Melting point −30 °C (−22 °F; 243 K)
Boiling point 235 to 239 °C (455 to 462 °F; 508 to 512 K)
Hazards
GHS pictograms GHS05: CorrosiveGHS06: ToxicGHS08: Health hazard
GHS Signal word Danger
H301, H310, H314, H332, H371, H412
P260, P261, P262, P264, P270, P271, P273, P280, P301+310, P301+330+331, P302+350, P302+352, P303+361+353, P304+312, P304+340, P305+351+338, P309+311, P310, P312, P322, P330, P332+313, P337+313, P361, P362
Flash point 99 °C (210 °F; 372 K) (closed cup)
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

Tetrahydroisoquinoline (TIQ or THIQ) is an organic compound with the chemical formula C9H11N. Classified as a secondary amine, it is derived from isoquinoline by hydrogenation. It is a colorless viscous liquid that is miscible with most organic solvents. The tetrahydroisoquinoline skeleton is encountered in a number of bioactive compounds and drugs.[2][3]

Reactions

As a secondary amine, tetrahydroisoquinoline has weakly basic properties and forms salts with strong acids. It can be dehydrogenated to give isoquinoline and hydrogenated to decahydroisoquinoline. Like other secondary amines, tetrahydroisoquinoline can be oxidized to the corresponding nitrone using hydrogen peroxide, catalyzed by selenium dioxide.[4]

Toxicology

Tetrahydroisoquinoline derivatives may be formed in the body as metabolites of some drugs, and this was once thought to be involved in the development of alcoholism.[5] This theory has now been discredited and is no longer generally accepted by the scientific community,[6] but endogenous production of neurotoxic tetrahydroisoquinoline derivatives such as norsalsolinol continue to be investigated as possible causes for some conditions such as Parkinson's disease.[7][8][9][10][11][12]

Tetrahydroisoquinolines

The tetrahydroisoquinoline skeleton is present in a number of drugs,[3] such as tubocurarine, one of the quaternary ammonium muscle relaxants. Drugs based on 4-substituted tetrahydroisoquinolines include nomifensine[13] and diclofensine. They can be prepared by N-alkylation of benzyl amines with haloacetophenones.[14] Naturally occurring tetrahydroisoquinolines include cherylline[15] and latifine.

Esproquin,[16] which shows hypotensive activity by virtue of its α-adrenergic blocking properties, is made from THIQ.

References

  1. ↑ "1,2,3,4-Tetrahydroisoquinoline" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/7046#section=Safety-and-Hazards. 
  2. ↑ Mitchenson, Andrew (2000). "Saturated nitrogen heterocycles". Journal of the Chemical Society, Perkin Transactions 1 (17): 2862–2892. doi:10.1039/A908537H. 
  3. ↑ 3.0 3.1 Scott, Jack D.; Williams, Robert M. (2002). "Chemistry and Biology of the Tetrahydroisoquinoline Antitumor Antibiotics". Chemical Reviews 102 (5): 1669–1730. doi:10.1021/cr010212u. PMID 11996547. 
  4. ↑ Murahashi, S. (1987). "Selenium dioxide catalyzed oxidation of secondary amines with hydrogen peroxide. Simple synthesis of nitrones from secondary amines". Tetrahedron Letters 28 (21): 2383–2386. doi:10.1016/S0040-4039(00)96130-6. 
  5. ↑ Blum, K.; Hamilton, M. G.; Hirst, M.; Wallace, J. E. (1978). "Putative role of isoquinoline alkaloids in alcoholism: a link to opiates". Alcoholism: Clinical and Experimental Research 2 (2): 113–120. doi:10.1111/j.1530-0277.1978.tb04710.x. PMID 350073. ,Altshuler, H. L.; Shippenberg (1982). "Tetrahydroisoquinoline and opioid substrates of alcohol actions". Progress in Clinical and Biological Research 90: 329–344. PMID 7202207. , Myers, R. D. (1989). "Isoquinolines, beta-carbolines and alcohol drinking: involvement of opioid and dopaminergic mechanisms". Experientia 45 (5): 436–443. doi:10.1007/BF01952025. PMID 2656285. 
  6. ↑ Myers, R. D. (1996). "Tetrahydroisoquinolines and alcoholism: where are we today?". Alcoholism: Clinical and Experimental Research 20 (3): 498–500. doi:10.1111/j.1530-0277.1996.tb01081.x. PMID 8727243. , Musshoff, F.; Daldrup, T.; Bonte, W.; Leitner, A.; Lesch, O. M. (1996). "Formaldehyde-derived tetrahydroisoquinolines and tetrahydro-beta-carbolines in human urine". Journal of Chromatography B 683 (2): 163–176. doi:10.1016/0378-4347(96)00106-5. PMID 8891913. , Sällström Baum, S.; Hill, R.; Kiianmaa, K.; Rommelspacher, H. (1999). "Effect of ethanol on (R)- and (S)-salsolinol, salsoline, and THP in the nucleus accumbens of AA and ANA rats". Alcohol (Fayetteville, N.Y.) 18 (2–3): 165–169. doi:10.1016/S0741-8329(98)00080-9. PMID 10456568. , Musshoff, F.; Lachenmeier, D. W.; Schmidt, P.; Dettmeyer, R.; Madea, B. (2005). "Systematic regional study of dopamine, norsalsolinol, and (R/S)-salsolinol levels in human brain areas of alcoholics". Alcoholism: Clinical and Experimental Research 29 (1): 46–52. doi:10.1097/01.ALC.0000150011.81102.C2. PMID 15654290. 
  7. ↑ "1-Benzyl-1,2,3,4-tetrahydroisoquinoline as a parkinsonism-inducing agent: a novel endogenous amine in mouse brain and parkinsonian CSF". Journal of Neurochemistry 65 (6): 2633–8. December 1995. doi:10.1046/j.1471-4159.1995.65062633.x. PMID 7595560. 
  8. ↑ "Isoquinoline derivatives as endogenous neurotoxins in the aetiology of Parkinson's disease". Biochemical Pharmacology 56 (8): 921–33. October 1998. doi:10.1016/S0006-2952(98)00142-7. PMID 9776302. 
  9. ↑ "Effect of acute and chronic administration of 1,2,3,4-tetrahydroisoquinoline on muscle tone, metabolism of dopamine in the striatum and tyrosine hydroxylase immunocytochemistry in the substantia nigra, in rats". Neuroscience 95 (4): 1049–59. 2000. doi:10.1016/S0306-4522(99)00511-4. PMID 10682712. 
  10. ↑ "Selective dopaminergic neurotoxicity of isoquinoline derivatives related to Parkinson's disease: studies using heterologous expression systems of the dopamine transporter". Biochemical Pharmacology 63 (5): 909–20. March 2002. doi:10.1016/S0006-2952(01)00922-4. PMID 11911843. 
  11. ↑ "The influence of acute and chronic administration of 1,2-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline on the function of the nigrostriatal dopaminergic system in rats". Neuroscience 156 (4): 973–86. October 2008. doi:10.1016/j.neuroscience.2008.08.050. PMID 18809471. 
  12. ↑ "The mechanisms of oxidative DNA damage and apoptosis induced by norsalsolinol, an endogenous tetrahydroisoquinoline derivative associated with Parkinson's disease". Journal of Neurochemistry 108 (2): 397–407. January 2009. doi:10.1111/j.1471-4159.2008.05774.x. PMID 19012744. 
  13. ↑ Schneider, C. S.; Weber, K. H.; Daniel, H.; Bechtel, W. D.; Boeke-Kuhn, K. (1984). "Synthesis and antidepressant activity of 4-aryltetrahydrothieno[2,3-c]pyridine derivatives". Journal of Medicinal Chemistry 27 (9): 1150–1155. doi:10.1021/jm00375a011. PMID 6471069. 
  14. ↑ BG patent 49761
  15. ↑ cherylline
  16. ↑ Gray, Allan P.; Shiley, Richard H. (1973). "Preparation and cardiovascular actions of a group of tetrahydroisoquinoline derivatives". Journal of Medicinal Chemistry 16 (7): 859–861. doi:10.1021/jm00265a028. ISSN 0022-2623. PMID 4146907. 



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