A-349821

A-349,821 is a potent and selective histamine H₃ receptor antagonist[1] (or possibly an inverse agonist).[2] It has nootropic effects in animal studies,[3] although there do not appear to be any plans for clinical development at present and it is currently only used in laboratory research.

A-349821
Identifiers

IUPAC name [4-[4-[3-[(2R,5R)-2,5-dimethylpyrrolidin-1-yl]propoxy]phenyl]phenyl]-morpholin-4-ylmethanone
CAS Number	372513-99-0^N 556835-30-4 (trifluoroacetate salt)
PubChem CID	9954017
IUPHAR/BPS	1217
ChemSpider	8129627^Y
UNII	67WL275ISI
ChEMBL	ChEMBL179702^Y
Chemical and physical data
Formula	C₂₆H₃₄N₂O₃
Molar mass	422.558 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES C[C@@H]1CC[C@H](N1CCCOC2=CC=C(C=C2)C3=CC=C(C=C3)C(=O)N4CCOCC4)C
InChI InChI=1S/C26H34N2O3/c1-20-4-5-21(2)28(20)14-3-17-31-25-12-10-23(11-13-25)22-6-8-24(9-7-22)26(29)27-15-18-30-19-16-27/h6-13,20-21H,3-5,14-19H2,1-2H3/t20-,21-/m1/s1^Y Key:CFUHKRLMDNFZED-NHCUHLMSSA-N^Y
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References

Faghih R, Dwight W, Pan JB, Fox GB, Krueger KM, Esbenshade TA, et al. (April 2003). "Synthesis and SAR of aminoalkoxy-biaryl-4-carboxamides: novel and selective histamine H3 receptor antagonists". Bioorganic & Medicinal Chemistry Letters. 13 (7): 1325–8. doi:10.1016/S0960-894X(03)00118-5. PMID 12657274.
Witte DG, Yao BB, Miller TR, Carr TL, Cassar S, Sharma R, et al. (July 2006). "Detection of multiple H3 receptor affinity states utilizing [3H]A-349821, a novel, selective, non-imidazole histamine H3 receptor inverse agonist radioligand". British Journal of Pharmacology. 148 (5): 657–70. doi:10.1038/sj.bjp.0706752. PMC 1751875. PMID 16715122.
Esbenshade TA, Fox GB, Krueger KM, Baranowski JL, Miller TR, Kang CH, et al. (September 2004). "Pharmacological and behavioral properties of A-349821, a selective and potent human histamine H3 receptor antagonist". Biochemical Pharmacology. 68 (5): 933–45. doi:10.1016/j.bcp.2004.05.048. PMID 15294456.

Histamine receptor modulators
H₁	Agonists: 2-Pyridylethylamine Betahistine Histamine HTMT L-Histidine UR-AK49 Antagonists: First-generation: 4-Methyldiphenhydramine Alimemazine Antazoline Azatadine Bamipine Benzatropine (benztropine) Bepotastine Bromazine Brompheniramine Buclizine Captodiame Carbinoxamine Chlorcyclizine Chloropyramine Chlorothen Chlorphenamine Chlorphenoxamine Cinnarizine Clemastine Clobenzepam Clocinizine Cloperastine Cyclizine Cyproheptadine Dacemazine Decloxizine Deptropine Dexbrompheniramine Dexchlorpheniramine Dimenhydrinate Dimetindene Diphenhydramine Diphenylpyraline Doxylamine Embramine Etodroxizine Etybenzatropine (ethylbenztropine) Etymemazine Fenethazine Flunarizine Histapyrrodine Homochlorcyclizine Hydroxyethylpromethazine Hydroxyzine Isopromethazine Isothipendyl Meclozine Medrylamine Mepyramine (pyrilamine) Mequitazine Methafurylene Methapyrilene Methdilazine Moxastine Orphenadrine Oxatomide Oxomemazine Perlapine Phenindamine Pheniramine Phenyltoloxamine Pimethixene Piperoxan Pipoxizine Promethazine Propiomazine Pyrrobutamine Talastine Thenalidine Thenyldiamine Thiazinamium Thonzylamine Tolpropamine Tripelennamine Triprolidine Second/third-generation: Acrivastine Alinastine Astemizole Azelastine Bamirastine Barmastine Bepiastine Bepotastine Bilastine Cabastinen Carebastine Cetirizine Clemastine Clemizole Clobenztropine Desloratadine Dorastine Ebastine Efletirizine Emedastine Epinastine Fexofenadine Flezelastine Ketotifen Latrepirdine Levocabastine Levocetirizine Linetastine Loratadine Mapinastine Mebhydrolin Mizolastine Moxastine Noberastine Octastine Olopatadine Perastine Pibaxizine Piclopastine Quifenadine (phencarol) Rocastine Rupatadine Setastine Sequifenadine (bicarphen) Talastine Temelastine Terfenadine Vapitadine Zepastine Others: Atypical antipsychotics (e.g., aripiprazole, asenapine, brexpiprazole, brilaroxazine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, ziprasidone, zotepine) Phenylpiperazine antidepressants (e.g., hydroxynefazodone, nefazodone, trazodone, triazoledione) Tetracyclic antidepressants (e.g., amoxapine, loxapine, maprotiline, mianserin, mirtazapine, oxaprotiline) Tricyclic antidepressants (e.g., amitriptyline, butriptyline, clomipramine, desipramine, dosulepin (dothiepin), doxepin, imipramine, iprindole, lofepramine, nortriptyline, protriptyline, trimipramine) Typical antipsychotics (e.g., chlorpromazine, flupenthixol, fluphenazine, loxapine, perphenazine, prochlorperazine, thioridazine, thiothixene) Unknown/unsorted: Azanator Belarizine Elbanizine Flotrenizine GSK1004723 Napactadine Tagorizine Trelnarizine Trenizine
H₂	Agonists: Amthamine Betazole Dimaprit Histamine HTMT Impromidine L-Histidine UR-AK49 Antagonists: Bisfentidine Burimamide Cimetidine Dalcotidine Donetidine Ebrotidine Etintidine Famotidine Isolamtidine Lafutidine Lamtidine Lavoltidine (loxtidine) Lupitidine Metiamide Mifentidine Niperotidine Nizatidine Osutidine Oxmetidine Pibutidine Quisultazine (quisultidine) Ramixotidine Ranitidine Roxatidine Sufotidine Tiotidine Tuvatidine Venritidine Xaltidine Zolantidine
H₃	Agonists: α-Methylhistamine Cipralisant Histamine Imetit Immepip Immethridine L-Histidine Methimepip Proxyfan Antagonists: A-349821 A-423579 ABT-239 ABT-652 AZD5213 Bavisant Betahistine Burimamide Ciproxifan Clobenpropit Conessine Enerisant GSK-189254 Impentamine Iodophenpropit Irdabisant JNJ-5207852 NNC 38-1049 PF-03654746 Pitolisant SCH-79687 Thioperamide VUF-5681
H₄	Agonists: 4-Methylhistamine α-Methylhistamine Histamine L-Histidine OUP-16 VUF-8430 Antagonists: JNJ-7777120 Mianserin Seliforant Thioperamide Toreforant VUF-6002
See also: Receptor/signaling modulators • Monoamine metabolism modulators • Monoamine reuptake inhibitors

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A-349821

See also

References