AM251

AM251
Identifiers
	IUPAC name 1-(2,4-dichlorophenyl)-5-(4-iodophenyl)-4-methyl-; N-(1-piperidyl)pyrazole-3-carboxamide;
CAS Number	183232-66-8
PubChem (CID)	2125
IUPHAR/BPS	3317
ChemSpider	2040
ChEBI	CHEBI:90724
ChEMBL	CHEMBL285932
ECHA InfoCard	100.162.062
Chemical and physical data
Formula	C22H21Cl2IN4O
Molar mass	555.238 g/mol
3D model (Jmol)	Interactive image
	SMILES O=C(NN1CCCCC1)c4nn(c2ccc(Cl)cc2Cl)c(c3ccc(I)cc3)c4C ;
	InChI InChI=1S/C22H21Cl2IN4O/c1-14-20(22(30)27-28-11-3-2-4-12-28)26-29(19-10-7-16(23)13-18(19)24)21(14)15-5-8-17(25)9-6-15/h5-10,13H,2-4,11-12H2,1H3,(H,27,30) ; Key:BUZAJRPLUGXRAB-UHFFFAOYSA-N ;
(verify)

AM-251 is an inverse agonist at the CB₁ cannabinoid receptor. AM-251 is structurally very close to SR141716A (rimonabant); both are biarylpyrazole cannabinoid receptor antagonists. In AM-251 the p-chloro group attached to the phenyl substituent at C-5 of the pyrazole ring is replaced with a p-iodo group. The resulting compound exhibits slightly better binding affinity for the CB₁ receptor (with a K_i value of 7.5nM) than SR141716A, which has a K_i value of 11.5nM, AM-251 is, however, about two-fold more selective for the CB₁ receptor when compared to SR141716A.^[1] Like SR141716A, it is additionally a μ-opioid receptor antagonist.^[2]

References[edit]

^ Lan, R., Liu, Q., Fan, P., et al. Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists. J Med Chem 42 769-776 (1999). PubMed 10052983
^ AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies. Neuropharmacology. 2012 Oct;63(5):905-15. doi: 10.1016/j.neuropharm.2012.06.046. Epub 2012 Jul 4. PMID 22771770 PMCID: PMC3408547

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[1] Lan, R., Liu, Q., Fan, P., et al. Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists. J Med Chem 42 769-776 (1999). PubMed 10052983

[2] AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies. Neuropharmacology. 2012 Oct;63(5):905-15. doi: 10.1016/j.neuropharm.2012.06.046. Epub 2012 Jul 4. PMID 22771770 PMCID: PMC3408547

[1]

[2]

v t e Opioid receptor modulators

MOR	Agonists (abridged; see here for a full list): 7-Acetoxymitragynine 7-Hydroxymitragynine ψ-Akuammigine α-Chlornaltrexamine α-Narcotine Acetyldihydrocodeine Acetylfentanyl Acrylfentanyl Adrenorphin (metorphamide) AH-7921 Akuammicine Akuammidine Alfentanil Anileridine Apparicine β-Endorphin BAM-12P BAM-18P BAM-22P Benzhydrocodone Benzylmorphine Bezitramide Biphalin BU08070 Buprenorphine Butorphan Butorphanol Butyrfentanyl BW-373U86 Carfentanil Casokefamide Cebranopadol Chloroxymorphamine Codeine DADLE DAMGO (DAGO) Dermorphin Desomorphine Dextromoramide Dextropropoxyphene (propoxyphene) Dezocine Dimenoxadol Dimethylaminopivalophenone Eluxadoline Diamorphine (heroin) Dihydrocodeine Dihydroetorphine Dihydromorphine Diphenoxylate Dipipanone Dynorphin A Embutramide Endomorphin-1 Endomorphin-2 Eseroline Ethylmorphine Etorphine Fentanyl Fluorophen Frakefamide Furanylfentanyl Hemorphin-4 Herkinorin Hodgkinsine Hydrocodone Hydromorphinol Hydromorphone IBNtxA Ketamine Ketobemidone Kratom Laudanosine Lefetamine Leu-enkephalin Levacetylmethadol Levomethorphan Levorphanol Lexanopadol Loperamide Matrine Meptazinol Met-enkephalin (metenkefalin) Methadone Metkefamide Metopon Mitragynine Mitragynine pseudoindoxyl Morphiceptin Morphine Nalbuphine Nalbuphine sebacate NalBzOH Nalmexone Naltalimide Neopine Nicocodeine Nicodicodeine Nicomorphine NKTR-181 Norketamine O-Desmethyltramadol Octreotide Oliceridine OM-3-MNZ Oripavine Oxycodone Oxymorphazone Oxymorphonazine Oxymorphone Oxymorphone phenylhydrazone OxyPNPH Papaver somniferum (opium) Pentazocine Pericine Pethidine (meperidine) Phenazocine Phencyclidine Piminodine Piritramide PL-017 Prodine Propiram PZM21 Racemethorphan Racemorphan Remifentanil Salsolinol SC-17599 Sinomenine Sufentanil Tapentadol Tetrahydropapaveroline TH-030418 Thebaine Thienorphine Tianeptine Tilidine Tramadol Trimebutine TRIMU 5 TRV734 Tubotaiwine U-47700 Valorphin Viminol Xorphanol PAMs: BMS-986121 BMS-986122 Antagonists: (3S,4S)-Picenadol 2-(S)-N,N-(R)-Viminol 4-Caffeoyl-1,5-quinide 4′-Hydroxyflavanone 4',7-Dihydroxyflavone 6β-Naltrexol 6β-Naltrexol-d4 18-MC α-Gliadin β-Chlornaltrexamine β-Funaltrexamine Akuammine Alvimopan AM-251 Apigenin AT-076 Axelopran Bevenopran Catechin Catechin gallate Clocinnamox CTAP CTOP Cyclofoxy Cyprodime Diacetylnalorphine Diprenorphine ECG EGC Epicatechin Eptazocine Gemazocine Ginsenoside R Hyperoside Ibogaine Levallorphan Lobeline LY-255582 LY-2196044 Methocinnamox Methylnaltrexone Methylsamidorphan chloride Naldemedine Nalmefene Nalodeine (N-allylnorcodeine) Nalorphine Nalorphine dinicotinate Naloxazone Naloxegol Naloxol Naloxonazine Naloxone Naltrexazone Naltrexonazine Naltrexone Naltrindole Naringenin Noribogaine Oxilorphan Pawhuskin A Rimonabant Quadazocine Samidorphan Taxifolin Unknown/unsorted: Cannabidiol Coronaridine Cyproterone acetate Dihydroakuuamine Tabernanthine Tetrahydrocannabinol

DOR	Agonists: 6'-GNTI 7-SIOM ADL-5747 (PF-04856881) ADL-5859 Amoxapine AR-M100390 (ARM390) AZD2327 β-Endorphin BAM-18P Biphalin BU-48 Butorphan Butorphanol BW-373U86 Casokefamide Cebranopadol Codeine Cyclazocine DADLE Deltorphin A Deltorphin I Deltorphin II Desmethylclozapine Dezocine Diamorphine (heroin) Dihydroetorphine Dihydromorphine DPDPE DPI-221 DPI-3290 DSLET Ethylketazocine Etorphine Fentanyl FIT Fluorophen Hemorphin-4 Hydrocodone Hydromorphone Ibogaine Isomethadone JNJ-20788560 KNT-127 Kratom Laudanosine Leu-enkephalin Levomethorphan Levorphanol Lexanopadol Lofentanil Met-enkephalin (metenkefalin) Metazocine Metkefamide Mitragynine Mitragynine pseudoindoxyl Morphine N-Phenethyl-14-ethoxymetopon Norbuprenorphine NalBzOH O-Desmethyltramadol Oripavine Oxycodone Oxymorphone Pethidine (meperidine) Proglumide Racemethorphan Racemorphan RWJ-394674 Samidorphan SB-235863 SKF-10047 SNC-80 SNC-162 TAN-67 (SB-205,607) TH-030418 Thebaine Thiobromadol (C-8813) Tianeptine Tonazocine Tramadol TRV250 Xorphanol Zenazocine Antagonists: 4',7-Dihydroxyflavone 5'-NTII 6β-Naltrexol 6β-Naltrexol-d4 α-Santolol β-Chlornaltrexamine Apigenin AT-076 Axelopran Bevenopran BNTX Catechin Catechin gallate Clocinnamox Diacetylnalorphine Diprenorphine ECG EGC Eluxadoline Epicatechin ICI-154129 ICI-174864 LY-255582 LY-2196044 Methylnaltrexone Methylnaltrindole N-Benzylnaltrindole Nalmefene Nalorphine Naltrexone Naltriben Naltrindole Naloxone Naringenin Noribogaine Pawhuskin A Quadazocine SDM25N SoRI-9409 Taxifolin Thienorphine Unknown/unsorted: 18-MC Cannabidiol Coronaridine Cyproterone acetate Tabernanthine Tetrahydrocannabinol

KOR	Agonists: 6'-GNTI 8-CAC 18-MC 14-Methoxymetopon β-Chlornaltrexamine β-Funaltrexamine Adrenorphin (metorphamide) Akuuamicine Alazocine Allomatrine Asimadoline BAM-12P BAM-18P BAM-22P Big dynorphin Bremazocine BRL-52537 Butorphan Butorphanol BW-373U86 Cebranopadol Ciprefadol CR665 Cyclazocine Cyclorphan Cyprenorphine Diamorphine (heroin) Diacetylnalorphine Difelikefalin Dihydroetorphine Dihydromorphine Diprenorphine Dynorphin A Dynorphin B (rimorphin) Eluxadoline Enadoline Eptazocine Erinacine E Ethylketazocine Etorphine Fedotozine Fentanyl Gemazocine GR-89696 GR-103545 Hemorphin-4 Herkinorin HS665 Hydromorphone HZ-2 Ibogaine ICI-199,441 ICI-204,448 Ketamine Ketazocine Laudanosine Leumorphin (dynorphin B-29) Levallorphan Levomethorphan Levorphanol Lexanopadol Lofentanil LPK-26 Lufuradom Matrine MB-1C-OH Menthol Metazocine Metkefamide Mianserin Mirtazapine Morphine Moxazocine MR-2034 N-MPPP Nalbuphine Nalbuphine sebacate NalBzOH Nalfurafine Nalmefene Nalodeine (N-allylnorcodeine) Nalorphine Naltriben Niravoline Norbuprenorphine Norbuprenorphine-3-glucuronide Noribogaine Norketamine O-Desmethyltramadol Oripavine Oxilorphan Oxycodone Pentazocine Pethidine (meperidine) Phenazocine Proxorphan Racemethorphan Racemorphan RB-64 Salvinorin A (salvia) Salvinorin B ethoxymethyl ether Salvinorin B methoxymethyl ether Samidorphan SKF-10047 Spiradoline (U-62,066) TH-030418 Thienorphine Tifluadom Tricyclic antidepressants (e.g., amitriptyline, desipramine, imipramine, nortriptyline) U-50,488 U-54,494A U-69,593 Xorphanol Antagonists: 4′-Hydroxyflavanone 4',7-Dihydroxyflavone 5'-GNTI 6'-GNTI 6β-Naltrexol 6β-Naltrexol-d4 β-Chlornaltrexamine Buprenorphine/samidorphan Amentoflavone ANTI Apigenin Arodyne AT-076 Axelopran AZ-MTAB Binaltorphimine BU09059 Buprenorphine Catechin Catechin gallate CERC-501 (LY-2456302) Clocinnamox Cyclofoxy Dezocine DIPPA EGC ECG Epicatechin Hyperoside JDTic LY-255582 LY-2196044 LY-2444296 LY-2459989 LY-2795050 MeJDTic Methylnaltrexone ML190 ML350 MR-2266 N-Fluoropropyl-JDTic Naloxone Naltrexone Naltrindole Naringenin Norbinaltorphimine Noribogaine Pawhuskin A PF-4455242 RB-64 Quadazocine Taxifolin UPHIT Zyklophin Unknown/unsorted: Akuammicine Akuammine Coronaridine Cyproterone acetate Dihydroakuuamine Ibogamine Tabernanthine

NOP	Agonists: (Arg14,Lys15)Nociceptin ((pF)Phe⁴)Nociceptin(1-13)NH₂ (Phe¹Ψ(CH₂-NH)Gly²)Nociceptin(1-13)NH₂ Ac-RYYRWK-NH₂ Ac-RYYRIK-NH₂ BU08070 Buprenorphine Cebranopadol Dihydroetorphine Etorphine JNJ-19385899 Levomethorphan Levorphanol Levorphanol Lexanopadol MCOPPB MT-7716 NNC 63-0532 Nociceptin (orphanin FQ) Nociceptin (1-11) Nociceptin (1-13)NH₂ Norbuprenorphine Racemethorphan Racemorphan Ro64-6198 Ro65-6570 SCH-221510 SCH-486757 SR-8993 SR-16435 TH-030418 Antagonists: (Nphe¹)Nociceptin(1-13)NH₂ AT-076 BAN-ORL-24 J-113397 JTC-801 LY-2940094 NalBzOH Nociceptin (1-7) Nocistatin SB-612111 SR-16430 Thienorphine Trap-101 UFP-101

Unsorted	β-Casomorphins Amidorphin BAM-20P Cytochrophin-4 Deprolorphin Gliadorphin (gluteomorphin) Gluten exorphins Hemorphins Kava constituents MEAGL MEAP NEM Neoendorphins Nepetalactone (catnip) Peptide B Peptide E Peptide F Peptide I Rubiscolins Soymorphins

Others	Enkephalinase inhibitors: Amastatin BL-2401 Candoxatril D -Phenylalanine Dexecadotril (retorphan) Ecadotril (sinorphan) Kelatorphan Racecadotril (acetorphan) RB-101 RB-120 RB-3007 Opiorphan Selank Semax Spinorphin Thiorphan Tynorphin Ubenimex (bestatin) Propeptides: β-Lipotropin (proendorphin) Prodynorphin Proenkephalin Pronociceptin Proopiomelanocortin (POMC) Others: Kyotorphin (met-enkephalin releaser/degradation stabilizer)

See also: Peptide receptor modulators

AM251

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