Talastine

Talastine
Systematic (IUPAC) name

4-benzyl-2-[2-(dimethylamino)ethyl]phthalazin-1(2H)-one
Identifiers
CAS Number	16188-61-7^Y
ATC code	R06AB07 (WHO)
PubChem	CID 65624
ChemSpider	59065^Y
UNII	49AB2PA48B^Y
Chemical data
Formula	C₁₉H₂₁N₃O
Molar mass	307.39 g/mol
SMILES O=C1c3ccccc3\C(=N/N1CCN(C)C)Cc2ccccc2
InChI InChI=1S/C19H21N3O/c1-21(2)12-13-22-19(23)17-11-7-6-10-16(17)18(20-22)14-15-8-4-3-5-9-15/h3-11H,12-14H2,1-2H3^Y Key:LCAAMXMULMCKLJ-UHFFFAOYSA-N^Y
(verify)

Talastine (trade name Ahanon) is an antihistamine.^[1]

Synthesis

The amide proton from 4-Benzylphalazone is abstracted with KOH, which is then alkylated with diethylaminoethyl chloride.^[2]

References

↑ Richter, G.; Kühn, E. (1990). "Talastine (Ahanon) as a cause of allergic drug exanthema". Dermatologische Monatschrift 176 (2–3): 111–113. PMID 1973126.
↑ Engelbrecht et al., DE 1046625 ; eidem, U.S. Patent 3,017,411 (1958, 1962, both to VEB Deutsches Hydrierwerk Rodleben).

External links

Antihistamines (R06)

Aminoalkyl ethers	Bromazine (bromodiphenhydramine) Carbinoxamine Clemastine Chlorphenoxamine Diphenylpyraline Diphenhydramine Doxylamine Orphenadrine Phenyltoloxamine

Substituted alkylamines	Brompheniramine Chlorphenamine Dexbrompheniramine (+pseudoephedrine) Dexchlorpheniramine (+betamethasone) Dimetindene Pheniramine Talastine

Substituted ethylenediamines	Chloropyramine Histapyrrodine Mepyramine Methapyrilene Tripelennamine (pyribenzamine)

Phenothiazine derivatives	Alimemazine Fenethazine Hydroxyethylpromethazine Isothipendyl Mequitazine Methdilazine Oxomemazine Promethazine

Piperazine derivatives	Buclizine Cetirizine Levocetirizine Chlorcyclizine Cinnarizine Cyclizine Hydroxyzine Meclizine Oxatomide

Others for systemic use	Antazoline Azanator Azatadine Bamipine Cyproheptadine Deptropine Ebastine Emedastine Epinastine Ketotifen Latrepirdine Mebhydrolin Mizolastine Olopatadine Phenindamine Pimethixene Pyrrobutamine Quifenadine Rupatadine Triprolidine selective (Acrivastine Astemizole Azelastine Bilastine Desloratadine Fexofenadine Loratadine Terfenadine)

For topical use	Bamipine Chloropyramine Chlorphenoxamine Clemastine Dimetindene Diphenhydramine Isothipendyl Mepyramine Promethazine Thenalidine

Histaminergics

Receptor
(ligands)

H₁	Agonists: 2-Pyridylethylamine Betahistine Histamine HTMT 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 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 Rocastine Rupatadine Setastine Talastine Temelastine Terfenadine Vapitadine Zepastine Non-generational: Atypical antipsychotics (e.g., aripiprazole, asenapine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, ziprasidone, zotepine) 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: Belarizine Elbanizine Flotrenizine Napactadine Tagorizine Trelnarizine Trenizine

H₂	Agonists: Amthamine Betazole Dimaprit Histamine HTMT Impromidine 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 Methimepip Proxyfan Antagonists: A-349,821 A-423,579 ABT-239 ABT-652 AZD5213 Betahistine Burimamide Ciproxifan Clobenpropit Conessine Enerisant GSK-189,254 Impentamine Iodophenpropit Irdabisant JNJ-5207852 MK-0249 NNC 38-1049 PF-03654746 Pitolisant SCH-79687 Thioperamide VUF-5681

H₄	Agonists: 4-Methylhistamine α-Methylhistamine Histamine OUP-16 VUF-8430 Antagonists: JNJ-7777120 Mianserin Thioperamide Toreforant VUF-6002

Transporter
(inhibitors)

VMATs

TAAR1 inactive	Amiodarone APP AZIK Bietaserpine Deserpidine Dihydrotetrabenazine Efavirenz GBR-12935 GZ-793A Ibogaine Ketanserin Lobeline Methoxytetrabenazine NBI-98854 Reserpine Rose bengal SD-809 Tetrabenazine Vanoxerine (GBR-12909)

TAAR1 active	Amphetamine Methamphetamine MDMA Phenethylamine

Enzyme
(inhibitors)

HDC	Catechin Meciadanol Naringenin Tritoqualine

HNMT	Amodiaquine Diphenhydramine Harmaline Metoprine Quinacrine SKF-91,488 Tacrine

DAO	Aminoguanidine

Others

Precursors	L -Histidine

Cofactors	Vitamin B₆

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