Fexofenadine hydrochloride

Bezeichnung:Fexofenadine hydrochloride

CAS-Nr153439-40-8

Englisch Name:Fexofenadine hydrochloride

CBNumberCB0256621

SummenformelC32H40ClNO4

Molgewicht538.13

MOL-Datei153439-40-8.mol

Fexofenadine hydrochloride physikalisch-chemischer Eigenschaften

Schmelzpunkt	148-150oC
RTECS-Nr.	CY1633377
storage temp.	2-8°C
Löslichkeit	Soluble in Dimethyl sulfoxide (50 mM), and methanol.
Aggregatzustand	powder
Farbe	white to beige
Merck	14,4068
InChIKey	RRJFVPUCXDGFJB-UHFFFAOYSA-N
CAS Datenbank	153439-40-8(CAS DataBase Reference)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36
WGK Germany	3
HS Code	2933399090

Gefahreninformationscode (GHS)

Fexofenadine hydrochloride Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Beschreibung
Fexofenadine is a histamine H₁ receptor antagonist (K_i = 10 nM). It reverses contraction of isolated rat tracheal strips induced by acetyl-β-methylcholine . Fexofenadine inhibits expression of IL-8 in TNF-α-stimulated HCT116 and COLO 205 cells. Oral administration of fexofenadine (2 and 10 mg/kg) reduces severity of colitis and phospho-IκB kinase activation in a mouse model of colitis induced by dextran sulfate sodium (DSS; ).
Chemische Eigenschaften
Off-White Crystalline Solid
Originator
Alernex,Dabur Pharmaceuticals Ltd.,India
Verwenden
Fexofenadine is a non-sedating antihistamine that selectively antagonizes the histamine H1 receptor with a Ki value of 10 nM and exhibits anti-inflammatory effects. It is devoid of central nervous system effects in part because it is a good substrate for the P-glycoprotein efflux pump situated within the blood-brain barrier.[Cayman Chemical]
Verwenden
A metabolite of of terfenadine, a H1-Histamine receptor antagonist
Verwenden
The active metabolite of Terfenadine (T114500), a H1-histamine receptor antagonist.
Verwenden
Fexofenadine hydrochloride is used as an antihistamine that inhibits Cox-1, Cox-2, and is a histamine H1 receptor agonist.
Verwenden
Antihistaminic;histamine H1-receptor antagonist
Definition
ChEBI: Fexofenadine hydrochloride is a diarylmethane.
Manufacturing Process
Microbiological Preparation of Fexofenadine (Patent U.S. 6,558,931)
Ten 250 ml Erlenmeyer flasks containing 100 ml of medium D are seeded with A. corymbifera LCP 63-1800. 50 mg of Terfenadine in 1 ml of ethanol is added to each Erlenmeyer flask. The content of 10 Erlenmeyer flasks are filtered on gauze (the supernatant has a pH equal to 8.0), and saturation with sodium chloride is carried out for 2 hours (pH = 5-6), followed by extracting 3 times with ethyl acetate and drying over magnesium sulfate. After evaporation under reduced pressure, 409 mg of expected crude product is obtained (yield = 77%, approximately 90% pure product). This product is purified on a column of silica gel (230-400 mesh, 40 g of silica, diameter = 3 cm) eluting with a methylene chloride/methanol/ammonium hydroxide mixture (82.5:15:2.5). 312 mg of pure Fexofenadine is recovered (61.4%).
Synthesis of Fexofenadine (Patent U.S. No. 5,578,610
Aluminum chloride (44 g; 0.33 mol) was added in portions to a solution of freshly distilled 4-chlorobutyryl chloride (17 mL; 0.15 mol) in 460 mL of carbon disulfide at -10°C under a nitrogen atmosphere. The mixture was stirred for 15 min, then the cooling bath was removed and the mixture was allowed to warm to ambient temperature. The mixture was stirred then for 15 min more, then cooled again to -10°C and a solution of ethyl-α,α- dimethylphenyl acetate (26.6 g; 0.14 mol) in 70 mL of carbon disulfide was added dropwise. The mixture was stirred for 3 hours, then stirred overnight at room temperature. The reaction mixture was partitioned between water and CHCl3. The combined organic portions were dried over MgSO4, filtered and concentrated in vacuo. The residue was dissolved in CH2Cl2 and filtered through a plug of SiO2, eluting with 10% EtOAc in hexane. Yield of ethyl 3- and 4-(4-chloro-1-oxobutyl)-α,α-dimethylphenylacetate 39.4 g (as a mixture of aromatic regioisomers).
To a solution of 39.4 g of ethyl 3- and 4-(4-chloro-1-oxobutyl)-α,α- dimethylphenylacetate dissolved in 800 mL of methanol and 200 mL of water was added 40 g of NaOH. The mixture was refluxed for one hour. The cooled mixture was then concentrated in vacuo. The concentrate was diluted with water and washed with 2 portions of EtOAc. The aqueous layer was acidified with concentrated HCl and extracted with 2 portions of EtOAc. The extracts were dried over MgSO4, filtered, and concentrated in vacuo to afford 30.3 g of crude product. The crude product was dissolved in 600 mL of EtOAc, 38 g of cinchonidine was added, and the mixture was stirred overnight. The resulting solids were filtered and washed with EtOAc and sucked dry under a rubber dam to afford 25 g of a solid 4-(cyclopropyl-oxo-methyl)-α,α- dimethylphenylacetic acid.
A solution of 10.5 g of 4-(cyclopropyl-oxo-methyl)-α,α-dimethylphenylacetic acid in 250 mL of CH2Cl2 was cooled in an ice-MeOH bath and 25 g of trimethylsilyliodide was then added via pipette. The mixture was stirred in the ice bath for one hour, warmed to ambient temperature, and stirred for one hour. A solution of aqueous sodium bisulfite was then added and the mixture was stirred well. The phases were partitioned and the aqueous layer was extracted with CH2Cl2. The combined organics were washed with saturated aqueous NaCl, dried over MgSO4, filtered, and concentrated in vacuo to afford 12.6 g (77%) of 4-(4-iodo-1-oxobutyl)-α,α-dimethylphenylacetic acid.
To a solution of 12.6 g of 4-(4-iodo-1-oxobutyl)-α,α-dimethylphenylacetic acid in 100 mL of ether cooled in an ice bath, was added 40 mL of ethereal CH2N2. The mixture was stirred at 0°C for few minutes, then let stand for 2 hours. A few drops of AcOH were added to decompose excess CH2N2, then the mixture was filtered and stripped to afford 12.6 g (96%) of methyl 4-(4-iodo-1- oxobutyl)-α,α-dimethylphenylacetate.
A solution of 12.6 g of methyl 4-(4-iodo-1-oxobutyl)-α,α- dimethylphenylacetate in 500 mL of toluene in a one liter three neck flask was added 8.8
Therapeutic Function
Antihistaminic
Allgemeine Beschreibung
Fexofenadine hydrochloride, (±)-4-[1-hydroxy-4-[4-(hydroxyldiphenylmethyl)- 1-piperinyl]butyl-α,α-dimethylbenzeneacetic acid (Allegra), occurs as a white to off-white crystalline powder that is freely soluble in methanol and ethanol, slightly soluble in chloroform and water, and insoluble in hexane.
This compound is marketed as a racemate and exists as a zwitterion in aqueous media at physiological pH. Fexofenadine is a primary oxidative metabolite of terfenadine. Terfenadine was developed during a search for new butyrophenone antipsychotic drugs as evidenced by the presence of the N-phenylbutanol substituent. It also contains a diphenylmethyl-piperidine moiety analogous to that found in the piperazine antihistamines.
Biologische Aktivität
Fexofenadine hydrochloride is a selective histamine H1 receptor antagonist (pKi = 8.1). Active metabolite of Terfenadine that displays non-sedating antiallergic effects. Fexofenadine hydrochloride counteracts histamine mediated immune suppression and improves immunotherapy response.
Biochem/physiol Actions
Fexofenadine is a non-sedating H1 histamine receptor antagonist.
Clinical Use
Antihistamine:
Symptomatic relief of rhinitis and urticaria
Arzneimittelwechselwirkung
Potentially hazardous interactions with other drugs
Antibacterials: effects possibly reduced by rifampicin.
Antivirals: concentration possibly increased by ritonavir.
Aluminium/magnesium containing antacids: reduced absorption - avoid for 2 hours.
Stoffwechsel
Fexofenadine undergoes negligible metabolism (hepatic or non-hepatic); about 5% of the total dose is metabolised, mostly by the intestinal mucosa, with 0.5-1.5% of the dose undergoing hepatic biotransformation by the cytochrome P450 system. The major route of elimination is believed to be via biliary excretion while up to 10% of ingested dose is excreted unchanged through the urine.

Fexofenadine hydrochloride Upstream-Materialien And Downstream Produkte

Fexofenadine hydrochloride Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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