79794-75-5

Abstract

Loratadine, sold under the brand name Claritin among others.Loratadine(Claritin) is a long-acting, non-sedating antihistamine that is used for the treatment of allergies. Histamine is a chemical that causes many of the signs and symptoms of an allergy. Histamine is released from histamine-storing cells (mast cells) and attaches to other cells that have receptors for histamine on their surfaces. Histamine stimulates the cells to release chemicals that produce effects that we associate with allergy, including welts, itching, and tissue swelling. Loratadine(Claritin) blocks one type of histamine receptor (the H1 receptor) and thus prevents activation of cells with H1 receptors by histamine.

Antiallergic

Loratadine is a common antiallergic medication, which is a second generation long-acting tricyclic antihistamine, rapid onset of action is strong, does not contain hormones, absorbed by the body metabolism with more active desloratadine, inhibiting histamine H1 receptor by competitively inhibit histamine-induced allergic symptoms, with? no obvious anticholinergic and central inhibition. It is used for the relief of clinical symptoms of allergic rhinitis related, such as sneezing, runny nose and nasal itching, eye itching and burning. It is also used to relieve symptoms of chronic urticaria and other allergic skin diseases.

Drug Interactions

Inhibition of hepatic drug-metabolizing enzyme function drugs can slow the metabolism of the product, such as itraconazole, ketoconazole, Daily with 400 mg ketoconazole suit, can make the product and its active metabolite to carboxyethyl loratadine increased plasma concentrations, but it was not observed in the changes of electrocardiogram (ECG). It can also inhibit the metabolism of loratadine when used with macrolides, cimetidine, theophylline and other drugs together.

Application

Antihistamines, peripheral nerves are highly selective H1-receptor, the role of strong, long time. For allergic arthritis, allergic rhinitis. National second-class anti-allergy drugs, for the relief of seasonal allergic rhinitis nasal and non-nasal symptoms and relieve chronic urticaria.

Side effects

Common side effects include sleepiness, dry mouth, and headache. Serious side effects are rare and include allergic reactions, seizures, and liver problems. Use during pregnancy appears to be safe but has not been well studied. It is not recommended in children less than two years old. It is in the second-generation antihistamine family of medication.

Preparation

Compound (I) (0.05mo1) was dissolved in toluene (450m1), dropwise addition of ethyl chloroformate (0.15mo1). Canada finished in the sauna heating 2h, and then stirred at room temperature overnight. Added 800ml water. The benzene layer was separated, washed with water, and dried. Decompression concentrated oil, with petroleum ether after impregnation with acetonitrile, recrystallization, the yield of loratadine, 64%.

Description

Loratadine is a non-sedating antihistamine indicated for use in allergic rhinitis and chronic urticaria. Its major advantage over other non-sedating antihistamines such as astemizole and terfenadine is its very fast onset of action. Loratadine is claimed not to cross the blood-brain barrier.

Chemical Properties

White Crystalline Solid

Uses

antinflammatory, analgesic, antipyretic

Indications

Loratadine (Claritin) is a long-acting, potent peripheral H1 blocker with minimal sedative effects. It does not appear to have the same adverse cardiac effects as the other nonsedating H1 antihistamines. It is indicated for allergic rhinitis and chronic urticaria.

Manufacturing Process

Preparation of Loratadine In a two-liter vessel provided with a thermometer, a reflux condenser and nitrogen atmosphere, dry tetrahydrofuran (343 ml) was placed, and cooled between 0 and -5°C. Titanium tetrachloride (28.5 ml, 49.5 g, 0.255 mol) was slowly added with stirring (17 min.), keeping the temperature in the above indicated range, a yellow suspension being formed. After the addition was finished, stirring was continued for 10 min. Then, zinc dust (34.5 g, 0.524 mol) was added with stirring in approximately 15 min. keeping the temperature in the above cited range, and after addition was finished, stirring was continued at this temperature for 20 min., a blue suspension being formed. Then, pyridine (17 ml, 0.21 mol) was added with stirring, keeping the temperature in the above range, and then, a solution of 8-chloro-5,6- dihydrobenzo[5,6]cyclohepta[1,2-b]pyridin-11-one (30.0 g, 0.123 mol) and ethyl 4-oxopiperidine-1-carboxylate (25.2 g, 0.147 mol) in anhydrous tetrahydrofuran (96 ml) was added in about 20 min., with stirring and keeping the temperature in the above cited range. The, thus obtained, dark brown mixture was stirred for 3 h keeping the temperature in the above cited range, then was allowed to heat to room temperature and kept at this temperature for 2 h and then heated to 40°C for 17 h. The tetrahydrofuran was distilled off from the reaction mixture to give a black resin that was dissolved in dichloromethane (300 ml) and acidified by addition of isopropanol/HCl 7.2 N (97 ml). The mixture was stirred for 10 min, and the phases were separated, being the aqueous one extracted with dichloromethane (150 ml). The combined organic phases were washed 6 times with a mixture of water (125 ml) and 35% aqueous HCl (7.5 ml). Then, the organic phase was basified to pH 7.5-8.0 by addition of 30% aqueous NH3. The mixture was stirred for 10 min and the phases were separated, and then washed 3 times with water (250 ml). The organic phase was dried with anhydrous sodium sulfate, filtered and the solvent eliminated in vacuo to give a residue (47.47 g) that was treated with acetonitrile (97 ml). The solid was filtered and crystallized from the same solvent to give pure Loratadine, m.p. 132-133°C (18.8 g, 40% yield).

Brand name

Alavert (Wyeth); Claritin (Schering-Plough).

General Description

Loratadine, 4-(8-chloro-5,6-dihydro-11Hbenzo[5,6]-cyclohepta[1,2-b]pyridin-l 1-ylidene-1-carboxylic acid ethyl ester, is a white to off-white powder insoluble in water but very soluble in acetone, alcohols, and chloroform. Loratadine is structurally related to the antihistamines azatadine and cyproheptadine, and to some tricyclic antidepressants. It differs from azatadine, in that a neutral carbamate group has replaced the basic tertiary amino moiety, and a phenyl ring has been substituted with a chlorine atom. Loratadine is a selective peripheral H1-antihistamine with a receptor-binding profile like that of the other members of this series, except that it has more antiserotonergic activity. Thus, it produces no substantial CNS or autonomic side effects or cardiac toxicity. Loratadine displays potency comparable with that of astemizole and greater than that of terfenadine. Loratadine is indicated for the relief of nasal and nonnasal symptoms of seasonal allergic rhinitis. In the presence of a CYP3A4 inhibitor ketoconazole, loratadine is metabolized to descarboethoxyloratadine predominantly by CYP2D6.

Biological Activity

Peripheral histamine H 1 receptor antagonist (K i = 35 nM); devoid of central effects. Orally active antiallergic agent.

Biochem/physiol Actions

Non-sedating histamine H1-receptor antagonist.

Pharmacokinetics

Good oral absorption, rapid and extensive metabolism in the liver, and excreted by urine and feces. After taking the medicine, the effect is fast, and some patients show the effect within 30 minutes. Tmax is 1.5 ~ 2 h, and the elimination half-life is 8 ~ 14 h. The half-life of the active metabolite decarboxymethylethoxyloratadine (DCL) is 17 ~ 24h. The half-life of the elderly and patients with liver disease may be longer. The binding rate of loratadine to plasma protein was 97% ~ 99%, and DCL was 73% ~ 76%. After 24 hours, about 27% of loratadine was excreted from urine, about 40% was eliminated from urine and 42% was excreted from stool after 10 days. With less milk secretion, it is safe to use drugs during lactation.

Clinical Use

Loratadine is related to the first-generation tricyclic antihistamines and to antidepressants. It is nonsedating, and neither it nor its major metabolite, desloratadine (descarboethoxyloratadine), is associated with the potentially cardiotoxic effects reported for terfenadine and astemizole. On chronic dosing, the AUC (plasma concentration–time curve) for the metabolite is greater than that for the parent drug, and its half-life is longer.

Drug interactions

Molecular weight (daltons) 382.9 % Protein binding 97-99 % Excreted unchanged in urine 40 Volume of distribution (L/kg) No data Half-life - normal/ESRF (hrs) 12-15 / Unchanged

Metabolism

Molecular weight (daltons) 382.9 % Protein binding 97-99 % Excreted unchanged in urine 40 Volume of distribution (L/kg) No data Half-life - normal/ESRF (hrs) 12-15 / Unchanged

Dosage forms

10 mg daily. Patients with liver or renal impairment should be started on a lower dose.

Consumer Uses

ECHA has no public registered data indicating whether or in which chemical products the substance might be used. ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment.