Chemistry:P-Hydroxynorephedrine

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Short description: Chemical compound


p-Hydroxynorephedrine
P-HO-Norephedrine Structure.svg
Clinical data
Other names4-Hydroxynorephedrine
para-Hydroxynorephedrine
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII
Chemical and physical data
FormulaC9H13NO2
Molar mass167.208 g·mol−1
3D model (JSmol)

p-Hydroxynorephedrine (PHN), or 4-hydroxynorephedrine, is the para-hydroxy analog of norephedrine and an active sympathomimetic metabolite of amphetamine in humans.[1][2] When it occurs as a metabolite of amphetamine, it is produced from both p-hydroxyamphetamine and norephedrine.[2][3][4]

Amphetamine metabolism

Metabolic pathways of amphetamine in humans[sources 1]
Graphic of several routes of amphetamine metabolism
Para-
Hydroxylation
Para-
Hydroxylation
Para-
Hydroxylation
unidentified
Beta-
Hydroxylation
Beta-
Hydroxylation
Oxidative
Deamination
Oxidation
unidentified
Glycine
Conjugation
The image above contains clickable links
In humans, para-hydroxynorephedrine is a metabolite of amphetamine. The aromatic ring hydroxylation of the substituted amphetamines in this image is mediated by CYP2D6 and dopamine β-hydroxylase.

Notes

  1. ↑ 4-Hydroxyamphetamine has been shown to be metabolized into 4-hydroxynorephedrine by dopamine beta-hydroxylase (DBH) in vitro and it is presumed to be metabolized similarly in vivo.[6][11] Evidence from studies that measured the effect of serum DBH concentrations on 4-hydroxyamphetamine metabolism in humans suggests that a different enzyme may mediate the conversion of 4-hydroxyamphetamine to 4-hydroxynorephedrine;[11][13] however, other evidence from animal studies suggests that this reaction is catalyzed by DBH in synaptic vesicles within noradrenergic neurons in the brain.[14][15]

See also

  • Hydroxynorephedrine

References

  1. ↑ [5][6][7][8][9][10][11][12]

References

  1. ↑ "p-Hydroxynorephedrine". NCBI. PubChem Compound. https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=11099. Retrieved 25 October 2013. 
  2. ↑ 2.0 2.1 "Adderall XR Prescribing Information". Medication Guide. United States Food and Drug Administration. http://www.accessdata.fda.gov/drugsatfda_docs/label/2013/021303s024lbl.pdf. Retrieved 7 October 2013. 
  3. ↑ "Amphetamine: Biomedical Effects and Toxicity". NCBI. Pubchem Compound. https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3007#x332. Retrieved 12 October 2013. 
  4. ↑ "Simultaneous determination of amphetamine and one of its metabolites by HPLC with electrochemical detection". J. Pharm. Biomed. Anal. 30 (2): 247–55. September 2002. doi:10.1016/S0731-7085(02)00330-8. PMID 12191709. 
  5. ↑ "Adderall XR Prescribing Information". United States Food and Drug Administration. Shire US Inc. December 2013. pp. 12–13. http://www.accessdata.fda.gov/drugsatfda_docs/label/2013/021303s026lbl.pdf. Retrieved 30 December 2013. 
  6. ↑ 6.0 6.1 Glennon RA (2013). Foye's principles of medicinal chemistry (7th ed.). Philadelphia, USA: Wolters Kluwer Health/Lippincott Williams & Wilkins. pp. 646–648. ISBN 9781609133450. "The simplest unsubstituted phenylisopropylamine, 1-phenyl-2-aminopropane, or amphetamine, serves as a common structural template for hallucinogens and psychostimulants. Amphetamine produces central stimulant, anorectic, and sympathomimetic actions, and it is the prototype member of this class (39). ... The phase 1 metabolism of amphetamine analogs is catalyzed by two systems: cytochrome P450 and flavin monooxygenase. ... Amphetamine can also undergo aromatic hydroxylation to p-hydroxyamphetamine. ... Subsequent oxidation at the benzylic position by DA β-hydroxylase affords p-hydroxynorephedrine. Alternatively, direct oxidation of amphetamine by DA β-hydroxylase can afford norephedrine." 
  7. ↑ Taylor KB (January 1974). "Dopamine-beta-hydroxylase. Stereochemical course of the reaction". Journal of Biological Chemistry 249 (2): 454–458. PMID 4809526. http://www.jbc.org/content/249/2/454.full.pdf. Retrieved 6 November 2014. "Dopamine-β-hydroxylase catalyzed the removal of the pro-R hydrogen atom and the production of 1-norephedrine, (2S,1R)-2-amino-1-hydroxyl-1-phenylpropane, from d-amphetamine.". 
  8. ↑ "Mammalian flavin-containing monooxygenases: structure/function, genetic polymorphisms and role in drug metabolism". Pharmacology & Therapeutics 106 (3): 357–387. June 2005. doi:10.1016/j.pharmthera.2005.01.001. PMID 15922018. 
    Table 5: N-containing drugs and xenobiotics oxygenated by FMO
  9. ↑ "N-oxygenation of amphetamine and methamphetamine by the human flavin-containing monooxygenase (form 3): role in bioactivation and detoxication". Journal of Pharmacology and Experimental Therapeutics 288 (3): 1251–1260. March 1999. PMID 10027866. 
  10. ↑ "Simultaneous determination of amphetamine and one of its metabolites by HPLC with electrochemical detection". Journal of Pharmaceutical and Biomedical Analysis 30 (2): 247–255. September 2002. doi:10.1016/S0731-7085(02)00330-8. PMID 12191709. 
  11. ↑ 11.0 11.1 11.2 "Dopamine-beta-oxidase activity in man, using hydroxyamphetamine as substrate". British Journal of Pharmacology and Chemotherapy 20: 278–284. April 1963. doi:10.1111/j.1476-5381.1963.tb01467.x. PMID 13977820. "Hydroxyamphetamine was administered orally to five human subjects ... Since conversion of hydroxyamphetamine to hydroxynorephedrine occurs in vitro by the action of dopamine-β-oxidase, a simple method is suggested for measuring the activity of this enzyme and the effect of its inhibitors in man. ... The lack of effect of administration of neomycin to one patient indicates that the hydroxylation occurs in body tissues. ... a major portion of the β-hydroxylation of hydroxyamphetamine occurs in non-adrenal tissue. Unfortunately, at the present time one cannot be completely certain that the hydroxylation of hydroxyamphetamine in vivo is accomplished by the same enzyme which converts dopamine to noradrenaline.". 
  12. ↑ "Glycine conjugation: importance in metabolism, the role of glycine N-acyltransferase, and factors that influence interindividual variation". Expert Opinion on Drug Metabolism & Toxicology 9 (9): 1139–1153. September 2013. doi:10.1517/17425255.2013.796929. PMID 23650932. "Figure 1. Glycine conjugation of benzoic acid. The glycine conjugation pathway consists of two steps. First benzoate is ligated to CoASH to form the high-energy benzoyl-CoA thioester. This reaction is catalyzed by the HXM-A and HXM-B medium-chain acid:CoA ligases and requires energy in the form of ATP. ... The benzoyl-CoA is then conjugated to glycine by GLYAT to form hippuric acid, releasing CoASH. In addition to the factors listed in the boxes, the levels of ATP, CoASH, and glycine may influence the overall rate of the glycine conjugation pathway.". 
  13. ↑ "Human serum dopamine-β-hydroxylase. Relationship to hypertension and sympathetic activity". Circulation Research 32 (5): 594–599. May 1973. doi:10.1161/01.RES.32.5.594. PMID 4713201. "The biologic significance of the different levels of serum DβH activity was studied in two ways. First, in vivo ability to β-hydroxylate the synthetic substrate hydroxyamphetamine was compared in two subjects with low serum DβH activity and two subjects with average activity. ... In one study, hydroxyamphetamine (Paredrine), a synthetic substrate for DβH, was administered to subjects with either low or average levels of serum DβH activity. The percent of the drug hydroxylated to hydroxynorephedrine was comparable in all subjects (6.5-9.62) (Table 3).". 
  14. ↑ "Formation of p-hydroxynorephedrine in brain following intraventricular administration of p-hydroxyamphetamine". Neuropharmacology 13 (12): 1187–1190. December 1974. doi:10.1016/0028-3908(74)90069-0. PMID 4457764. "In species where aromatic hydroxylation of amphetamine is the major metabolic pathway, p-hydroxyamphetamine (POH) and p-hydroxynorephedrine (PHN) may contribute to the pharmacological profile of the parent drug. ... The location of the p-hydroxylation and β-hydroxylation reactions is important in species where aromatic hydroxylation of amphetamine is the predominant pathway of metabolism. Following systemic administration of amphetamine to rats, POH has been found in urine and in plasma.
    The observed lack of a significant accumulation of PHN in brain following the intraventricular administration of (+)-amphetamine and the formation of appreciable amounts of PHN from (+)-POH in brain tissue in vivo supports the view that the aromatic hydroxylation of amphetamine following its systemic administration occurs predominantly in the periphery, and that POH is then transported through the blood-brain barrier, taken up by noradrenergic neurones in brain where (+)-POH is converted in the storage vesicles by dopamine β-hydroxylase to PHN.".     
  15. ↑ "Neurochemical effects of amphetamine metabolites on central dopaminergic and serotonergic systems". Journal of Pharmacology and Experimental Therapeutics 251 (3): 901–908. December 1989. PMID 2600821. "The metabolism of p-OHA to p-OHNor is well documented and dopamine-β hydroxylase present in noradrenergic neurons could easily convert p-OHA to p-OHNor after intraventricular administration.". 

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