Chemistry:Moexipril

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Short description: Antihypertensive drug of the ACE inhibitor class
Moexipril
Moexipril.svg
Clinical data
Trade namesUnivasc
AHFS/Drugs.comMonograph
MedlinePlusa695018
Pregnancy
category
  • US: D (Evidence of risk)
Routes of
administration		Oral
ATC code
Legal status
Legal status
  • UK: POM (Prescription only)
  • US: ℞-only
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability13-22%
Protein binding90%
MetabolismHepatic (active metabolite, moexiprilat)
Elimination half-life1 hour; 2-9 hours (active metabolite)
Excretion50% (faeces), 13% (urine)
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC27H34N2O7
Molar mass498.576 g·mol−1
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Moexipril was an angiotensin converting enzyme inhibitor (ACE inhibitor)[1] used for the treatment of hypertension and congestive heart failure. Moexipril can be administered alone or with other antihypertensives or diuretics.[2]

It works by inhibiting the conversion of angiotensin I to angiotensin II.[3]

It was patented in 1980 and approved for medical use in 1995.[4] Moexipril is available from Schwarz Pharma under the trade name Univasc.[3][5]

Side effects

Moexipril is generally well tolerated in elderly patients with hypertension.[6] Hypotension, dizziness, increased cough, diarrhea, flu syndrome, fatigue, and flushing have been found to affect less than 6% of patients who were prescribed moexipril.[3][6]

Mechanism of action

As an ACE inhibitor, moexipril causes a decrease in ACE. This blocks the conversion of angiotensin I to angiotensin II. Blockage of angiotensin II limits hypertension within the vasculature. Additionally, moexipril has been found to possess cardioprotective properties. Rats given moexipril one week prior to induction of myocardial infarction, displayed decreased infarct size.[7] The cardioprotective effects of ACE inhibitors are mediated through a combination of angiotensin II inhibition and bradykinin proliferation.[8][9] Increased levels of bradykinin stimulate in the production of prostaglandin E2[10] and nitric oxide,[9] which cause vasodilation and continue to exert antiproliferative effects.[8] Inhibition of angiotensin II by moexipril decreases remodeling effects on the cardiovascular system. Indirectly, angiotensin II stimulates of the production of endothelin 1 and 3 (ET1, ET3)[11] and the transforming growth factor beta-1 (TGF-β1),[12] all of which have tissue proliferative effects that are blocked by the actions of moexipril. The antiproliferative effects of moexipril have also been demonstrated by in vitro studies where moexipril inhibits the estrogen-stimulated growth of neonatal cardiac fibroblasts in rats.[9] Other ACE inhibitors have also been found to produce these actions, as well.

Pharmacology

Moexipril is available as a prodrug moexipril hydrochloride, and is metabolized in the liver to form the pharmacologically active compound moexiprilat. Formation of moexiprilat is caused by hydrolysis of an ethyl ester group.[13] Moexipril is incompletely absorbed after oral administration, and its bioavailability is low.[14] The long pharmacokinetic half-life and persistent ACE inhibition of moexipril allows once-daily administration.[15]

Moexipril is highly lipophilic,[2] and is in the same hydrophobic range as quinapril, benazepril, and ramipril.[15] Lipophilic ACE inhibitors are able to penetrate membranes more readily, thus tissue ACE may be a target in addition to plasma ACE. A significant reduction in tissue ACE (lung, myocardium, aorta, and kidney) activity has been shown after moexipril use.[8]

It has additional PDE4-inhibiting effects.[16]

Synthesis

Moexipril synthesis:[17][18]

The synthesis of the all-important dipeptide-like side chain involves alkylation of the tert-butyl ester of L-alanine (2) with ethyl 2-bromo-4-phenylbutanoate (1); the presominane of the desired isomer is attributable to asymmetric induction from the adjacent chiral center. Reaction of the product with hydrogen chloride then cleaves the tert-butyl group to give the half acid (3).[19] Coupling of that acid to the secondary amine on tetrahydroisoquinoline (4) gives the corresponding amine. The tert-butyl ester in this product is again cleaved with hydrogen chloride to afford moexipril (5).

References

  1. ↑ Hochadel, Maryanne, ed (2006). The AARP Guide to Pills. Sterling Publishing Company. p. 640. ISBN 978-1-4027-1740-6. https://archive.org/details/aarpguidetopills00hoch. Retrieved 2009-10-09. 
  2. ↑ 2.0 2.1 "Development of Membrane Electrodes for the Specific Determination of Moexipril Hydrochloride in Dosage Forms and Biological Fluids.". Portugaliae Electrochimica Acta 27 (4): 463–475. 2009. doi:10.4152/pea.200904463. 
  3. ↑ 3.0 3.1 3.2 Breakthroughs: New drug approvals of 1995 -- part 1. (Report). 140. Advanstar Communications, Inc.. 1996. p. 84. 
  4. ↑ (in en) Analogue-based Drug Discovery. John Wiley & Sons. 2006. p. 468. ISBN 9783527607495. https://books.google.com/books?id=FjKfqkaKkAAC&pg=PA468. 
  5. ↑ "Angiotensin-Converting Enzyme Inhibitors". Medical toxicology. Lippincott Williams & Wilkins. 2004. p. 647. ISBN 978-0-7817-2845-4. https://books.google.com/books?id=BfdighlyGiwC&pg=PA647. Retrieved 2009-10-09. 
  6. ↑ 6.0 6.1 "Long-term safety and efficacy of moexipril alone and in combination with hydrochlorothiazide in elderly patients with hypertension". Journal of Human Hypertension 9 (11): 879–884. November 1995. PMID 8583466. 
  7. ↑ "The renin-angiotensin system and vascular hypertrophy". Journal of the American College of Cardiology 28 (4): 803–812. October 1996. doi:10.1016/s0735-1097(96)00251-3. PMID 8837552. 
  8. ↑ 8.0 8.1 8.2 "Vascular remodeling: the role of angiotensin-converting enzyme inhibitors". American Heart Journal 135 (2 Pt 2): S21–S30. February 1998. doi:10.1053/hj.1998.v135.86971. PMID 9488609. 
  9. ↑ 9.0 9.1 9.2 "The role of bradykinin and nitric oxide in the cardioprotective action of ACE inhibitors". The Annals of Thoracic Surgery 60 (3): 789–92. September 1995. doi:10.1016/0003-4975(95)00192-N. PMID 7545893. 
  10. ↑ "Stimulation of endothelial cell prostaglandin production by angiotensin peptides. Characterization of receptors". Hypertension 19 (2 Suppl): II49–II55. February 1992. doi:10.1161/01.hyp.19.2_suppl.ii49. PMID 1735595. 
  11. ↑ "Interaction between endothelin and angiotensin II". Clinical and Experimental Pharmacology & Physiology 26 (7): 517–8. July 1999. doi:10.1046/j.1440-1681.1999.03069.x. PMID 10405777. 
  12. ↑ "Ventricular remodeling and transforming growth factor-beta 1 mRNA expression after nontransmural myocardial infarction in rats: effects of angiotensin converting enzyme inhibition and angiotensin II type 1 receptor blockade". Basic Research in Cardiology 94 (4): 246–253. August 1999. doi:10.1007/s003950050149. PMID 10505424. 
  13. ↑ "Metabolism of moexipril to moexiprilat: determination of in vitro metabolism using HPLC-ES-MS". Medicinal Chemistry 3 (1): 101–106. January 2007. doi:10.2174/157340607779317490. PMID 17266629. 
  14. ↑ "Moexipril and left ventricular hypertrophy". Vascular Health and Risk Management 3 (1): 23–30. 2007. PMID 17583172. 
  15. ↑ 15.0 15.1 "Moexipril shows a long duration of action related to an extended pharmacokinetic half-life and prolonged ACE inhibition". International Journal of Clinical Pharmacology and Therapeutics 40 (1): 9–17. January 2002. doi:10.5414/cpp40009. PMID 11837383. 
  16. ↑ "Chemical informatics uncovers a new role for moexipril as a novel inhibitor of cAMP phosphodiesterase-4 (PDE4)". Biochemical Pharmacology 85 (9): 1297–1305. May 2013. doi:10.1016/j.bcp.2013.02.026. PMID 23473803. 
  17. ↑ Hoefle ML, Klutchko S, "Substituted acyl derivatives of 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acids, salts thereof, pharmaceutical compositions containing the derivatives or salts, and the production of the same", EP patent 49605, published 1982-04-14; M. L. Hoefle, S. Klutchko, U.S. Patent 4,344,949 (1982 to Warner-Lambert).
  18. ↑ "Synthesis of novel angiotensin converting enzyme inhibitor quinapril and related compounds. A divergence of structure-activity relationships for non-sulfhydryl and sulfhydryl types". Journal of Medicinal Chemistry 29 (10): 1953–1961. October 1986. doi:10.1021/jm00160a026. PMID 3020249. 
  19. ↑ "Synthesis of [S-(R∗,R∗)] – Ethyl Α–[(1–Carboxyethyl) Amino]–Benezenebutanoate, an Important Intermediate in the Synthesis of Angiotensin Converting Enzyme Inhibitors". Organic Preparations and Procedures International 15 (1–2): 35–40. 2009. doi:10.1080/00304948309355428. 



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