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Meclinertant (SR48692)



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SR-48692 structure.png

2-[[1-(7-chloroquinolin-4-yl)-5-(2,6-dimethoxyphenyl)pyrazole-3-carbonyl]amino]adamantane-2-carboxylic acid

Meclinertant (SR-48692) is a drug which acts as a selective, non-peptide antagonist at the neurotensin receptor NTS1, and was the first non-peptide antagonist developed for this receptor.[1][2] It is used in scientific research to explore the interaction between neurotensin and other neurotransmitters in the brain,[3][4][5][6][7][8] and produces anxiolytic, anti-addictive and memory-impairing effects in animal studies.[9][10][11][12]

PatentSubmittedGranted1-(7-chloroquinolin-4-yl)pyrazole-3-carboxamide N-oxide derivatives, method of preparing them, and their pharmaceutical compositions [US5561234]1996-10-01

Substituted 1-naphthyl-3-pyrazolecarboxamides which are active on neurotensin [US5585497]1996-12-17

3-amidopyrazole derivatives, process for preparing these and pharmaceutical composites containing them [US5420141]1995-05-30

Substituted 1-naphthyl-3-pyrazolecarboxamides which are active on neurotensin, their preparation and pharmaceutical compositions containing them [US5523455]1996-06-04

3-amidopyrazole derivatives, process for preparing these and pharmaceutical compositions containing them [US5607958]1997-03-04

3-amidopyrazole derivatives, process for preparing these and pharmaceutical compositions containing them [US5616592]1997-04-01

3-amidopyrazole derivatives, process for preparing these and pharmaceutical compositions containing them [US5635526]1997-06-03

Substituted 1-phenyl-3-pyrazolecarboxamides active on neurotensin receptors, their preparation and pharmaceutical compositions containing them [US5965579]1999-10-12


Systematic (IUPAC) name
2-([1-(7-Chloro-4-quinolinyl)-5-(2,6-dimethoxyphenyl)-1H-pyrazole-3-carbonyl]amino)admantane-2-carboxylic acid
Clinical data
Legal status
CAS number 146362-70-1 Yes
ATC code ?
PubChem CID 119192
IUPHAR ligand 1582
Chemical data
Formula C32H31ClN4O5 
Mol. mass 587.064

 A Machine-Assisted Flow Synthesis of SR48692: A Probe for the Investigation of Neurotensin Receptor-1 (pages 7917–7930)

Dr. Claudio Battilocchio, Benjamin J. Deadman, Dr. Nikzad Nikbin, Dr. Matthew O. Kitching, Prof. Ian R. Baxendale and Prof. Steven V. Ley

Article first published online: 16 APR 2013 | DOI: 10.1002/chem.201300696

Flow and pharmaceuticals? An investigation into whether machine-assisted technologies can be of true help in the multistep synthesis of a potent neurotensin receptor-1 probe, Meclinertant (SR48692; see structure), is reported.

Meclinertant (SR 48692)
We developed an improved synthesis of the neurotensin antagonist biological probe SR 48692. The preparation includes an number of  chemical conversions and strategies  involving the use of flow chemistry platforms which helped overcome some of the limiting synthetic transformations in the original chemical route .


Meclinertant (SR 48692): The synthesis of neurotensin antagonist SR 48692 for prostate cancer research I.R. Baxendale, S. Cheung, M.O. Kitching, S.V. Ley, J.W. Shearman Bio. Org. Med. Chem. 2013, 21, 4378-4387.

A synthesis of the neurotensin 1 receptor probe Merclinertant (SR48692) has been reported using a range of continuous flow through synthesis, in-line reaction monioring and purification techniques. This strategy has been contrasted with a more conventional batch synthesis approach.

Notably the safe use of phosgene gas (generated in situ), the superheating of solvents to accelerate reaction rates, the processing of a reagent suspension under continuous flow-through conditions and the application of semi-permeable membrane technology to facilitate work-up and purification were all techniques that could be beneficially applied in the synthetic scheme.



An improved synthesis of the molecule SR 48692 is presented and its use as a neurotensin antagonist biological probe for use in cancer research is described. The preparation includes an number of enhanced chemical conversions and strategies to overcome some of the limiting synthetic transformations in the original chemical route.
The Synthesis of Neurotensin Antagonist SR 48692 for Prostate Cancer Research.Bioorg. Med. Chem. 201321, 4378-4387.
Link: 10.1016/j.bmc.2013.04.075Baxendale, I. R.; Cheung, S.; Kitching, M. O.; Ley, S. V. Shearman, J. W.
Graphical Abstract

Meclinertant, Reminertant, SR-48692
The condensation of 2′,6′-dimethoxyacetophenone (I) with diethyl oxalate (II) by means of sodium methoxide in refluxing methanol gives the dioxobutyrate (III), which is cyclized with 7-chloroquinoline-4-hydrazine (IV) in refluxing acetic acid yielding the pyrazole derivative (V). The hydrolysis of the ester group of (V) with KOH in refluxing methanol/water affords the corresponding carboxylic acid (VI), which is finally treated with SOCl2 in refluxing toluene and condensed with 2-aminoadamantane-2-carboxylic acid.

EP 0477049; FR 2665898; JP 1992244065; US 5420141; US 5607958; US 5616592; US 5635526; US 5744491; US 5744493


  1.  Gully D, Canton M, Boigegrain R, Jeanjean F, Molimard JC, Poncelet M, Gueudet C, Heaulme M, Leyris R, Brouard A (January 1993).“Biochemical and pharmacological profile of a potent and selective nonpeptide antagonist of the neurotensin receptor”Proceedings of the National Academy of Sciences of the United States of America 90 (1): 65–9. doi:10.1073/pnas.90.1.65PMC 45600PMID 8380498.
  2.  Gully D, Jeanjean F, Poncelet M, Steinberg R, Soubrié P, Le Fur G, Maffrand JP (1995). “Neuropharmacological profile of non-peptide neurotensin antagonists”. Fundamental & Clinical Pharmacology 9 (6): 513–21. doi:10.1111/j.1472-8206.1995.tb00528.x.PMID 8808171.
  3.  Rostene W, Azzi M, Boudin H, Lepee I, Souaze F, Mendez-Ubach M, Betancur C, Gully D (April 1997). “Use of nonpeptide antagonists to explore the physiological roles of neurotensin. Focus on brain neurotensin/dopamine interactions”. Annals of the New York Academy of Sciences 814: 125–41. doi:10.1111/j.1749-6632.1997.tb46151.xPMID 9160965.
  4. Jump up^ Jolas T, Aghajanian GK (August 1997). “Neurotensin and the serotonergic system”. Progress in Neurobiology 52 (6): 455–68.doi:10.1016/S0301-0082(97)00025-7PMID 9316156.
  5. Jump up^ Dobner PR, Deutch AY, Fadel J (June 2003). “Neurotensin: dual roles in psychostimulant and antipsychotic drug responses”. Life Sciences73 (6): 801–11. doi:10.1016/S0024-3205(03)00411-9PMID 12801600.
  6. Jump up^ Chen L, Yung KK, Yung WH (September 2006). “Neurotensin selectively facilitates glutamatergic transmission in globus pallidus”.Neuroscience 141 (4): 1871–8. doi:10.1016/j.neuroscience.2006.05.049PMID 16814931.
  7.  Petkova-Kirova P, Rakovska A, Della Corte L, Zaekova G, Radomirov R, Mayer A (September 2008). “Neurotensin modulation of acetylcholine, GABA, and aspartate release from rat prefrontal cortex studied in vivo with microdialysis”. Brain Research Bulletin 77 (2–3): 129–35. doi:10.1016/j.brainresbull.2008.04.003PMID 18721670.
  8.  Petkova-Kirova P, Rakovska A, Zaekova G, Ballini C, Corte LD, Radomirov R, Vágvölgyi A (December 2008). “Stimulation by neurotensin of dopamine and 5-hydroxytryptamine (5-HT) release from rat prefrontal cortex: possible role of NTR1 receptors in neuropsychiatric disorders”.Neurochemistry International 53 (6–8): 355–61. doi:10.1016/j.neuint.2008.08.010PMID 18835308.
  9.  Griebel G, Moindrot N, Aliaga C, Simiand J, Soubrié P (December 2001). “Characterization of the profile of neurokinin-2 and neurotensin receptor antagonists in the mouse defense test battery”. Neuroscience and Biobehavioral Reviews 25 (7–8): 619–26. doi:10.1016/S0149-7634(01)00045-8PMID 11801287.
  10.  Tirado-Santiago G, Lázaro-Muñoz G, Rodríguez-González V, Maldonado-Vlaar CS (October 2006). “Microinfusions of neurotensin antagonist SR 48692 within the nucleus accumbens core impair spatial learning in rats”. Behavioral Neuroscience 120 (5): 1093–102. doi:10.1037/0735-7044.120.5.1093PMID 17014260.
  11.  Felszeghy K, Espinosa JM, Scarna H, Bérod A, Rostène W, Pélaprat D (December 2007). “Neurotensin receptor antagonist administered during cocaine withdrawal decreases locomotor sensitization and conditioned place preference”Neuropsychopharmacology 32 (12): 2601–10. doi:10.1038/sj.npp.1301382PMC 2992550PMID 17356568.
  12. Lévesque K, Lamarche C, Rompré PP (October 2008). “Evidence for a role of endogenous neurotensin in the development of sensitization to the locomotor stimulant effect of morphine”.European Journal of Pharmacology 594 (1–3): 132–8. doi:10.1016/j.ejphar.2008.07.048PMID 18706409.

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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with AFRICURE PHARMA, ROW2TECH, CLEANCHEM LABS as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 32 PLUS year tenure till date Feb 2023, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 38 lakh plus views on New Drug Approvals Blog in 227 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc He has total of 32 International and Indian awards

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