Febuxostat

Febuxostat Basic information
Indications and Usage Mechanisms of Action
Product Name:Febuxostat
Synonyms:Febuxostat (Uloric);Febuxostat (TEI-6720);Febuxostat Tablets;FEBUXOSTAT API;Febuxostat (This product is unavailable in the U.S.);Febuxostat Tabletshehe;Febuxostat 2-[3-Cyano-4-isobutoxyphenyl]-4-methylthiazole-5-carboxylic acid;Febuxostat, >=99%
CAS:144060-53-7
MF:C16H16N2O3S
MW:316.37
EINECS:682-158-6
Product Categories:Heterocycles;Inhibitors;Intermediates & Fine Chemicals;Pharmaceuticals;eterocycles;TRILIPIX;Other APIs;Febuxostat;API;zjh;144060-53-7
Mol File:144060-53-7.mol
Febuxostat Structure
Febuxostat Chemical Properties
Melting point 238-239°(dec.)
Boiling point 536.6±60.0 °C(Predicted)
density 1.31±0.1 g/cm3(Predicted)
storage temp. 2-8°C
solubility DMSO (Slightly), Methanol (Slightly)
pka2.48±0.10(Predicted)
form powder
color White to Off-White
Merck 14,3948
CAS DataBase Reference144060-53-7(CAS DataBase Reference)
Safety Information
RTECS XJ3675310
HS Code 2934.10.2000
MSDS Information
Febuxostat Usage And Synthesis
Indications and UsageFebuxostat is a new generation xanthine oxidase inhibitor developed by Tejin Co. (Japan,) used clinically for for long-term treatment of hyperuicemia (gout,) a new and highly effective non-purine selective inhibitor of xanthine oxidase. It is not recommended for gout patients without hyperuricemia.
Mechanisms of ActionThe production of uric acid in the body is related to purine metabolism. In the last step of the production, hypoxanthine produces xanthine through the action of xanthine oxidoreductase (XOR), finally producing uric acid. Inhibiting the activity of this enzyme can effectively reduce the production of uric acid. Xanthine oxidase is the main enzyme promoting uric acid production. Through highly selective inhibition of oxidized and reduced xanthine oxidase, Febuxostat can reduce synthesis of uric acid, decreasing its concentration and effectively treating gout . Through liver metabolism, Xanthine oxidase does not rely on renal excretion, so patients with moderate to severe liver and kidney dysfunction do not need to reduce dosages. Febuxostat is a non-purine XOR inhibitor, so it is very safe.
DescriptionFebuxostat is an antihyperuricemic nonpurine inhibitor of both the oxidized and reduced forms of xanthine oxidase. It inhibits bovine milk xanthine oxidase as well as mouse and rat liver xanthine oxidase/xanthine dehydrogenase (IC50s = 1.4, 1.8, and 2.2 nM, respectively). It is 10-30 times more potent than the hypoxanthine analog allopurinol (; Kis = 0.7 nM and 0.7 μM, respectively). Febuxostat decreases the serum level of urate in a potassium oxonate rat model of hyperuricemia (ED50 = 1.5 mg/kg). It reduces hepatic macrovesicular steatosis in mice fed a high-fat diet containing trans fatty acids when administered at a dose of 1 mg/kg per day. Febuxostat (0.75 mg/kg) also increases CNS expression of glutamate oxaloacetate transaminase 2 (GOT2) and improves neurological symptoms in a mouse model of secondary progressive experimental autoimmune encephalomyelitis (EAE). Formulations containing febuxostat have been used in the treatment of symptomatic hyperuricemia in patients with gout.
DescriptionFebuxostat, a selective xanthine oxidase inhibitor, was launched for the chronic management of hyperuricemia in patients with gout. Hyperuricemia is defined as a serum uric acid concentration exceeding the limit of solubility. It predisposes affected persons to gout, a disease characterized by the formation of crystals of monosodium urate or uric acid from supersaturated fluids in joints and other tissues. Crystal deposition is asymptomatic, but it is revealed by bouts of joint inflammation. If left untreated, further crystals accumulate in joints and can form deposits known as tophi. A major aim in gout management is the long-term reduction of serum uric acid concentrations below saturation levels, as this results in crystal dissolution and eventual disappearance.
Febuxostat is a nonpurine derivative with higher potency and selectivity than allopurinol for inhibiting xanthine oxidase. It completely inhibits human xanthine oxidase activity in the lung cancer cell line A549, whereas the activities of other enzymes involved in purine or pyrimidine metabolism (e.g., purine nucleoside phosphorylase, adenosine deaminase, and pyrimidine nucleoside phosphorylase) are affected by <4%.
The incidence of adverse events such as dizziness, diarrhea, headache, and nausea with febuxostat was similar to allopurinol. Febuxostat is contraindicated in patients being treated with the xanthine oxidase substrates such as azathioprine, mercaptopurine, and theophylline. Febuxostat can be synthesized in a multistep sequence from 2,4-dicyanophenol, starting with the alkylation of the phenolic hydroxyl group with isobutyl bromide and potassium carbonate, followed by treatment with thioacetamide in hot dimethyl formamide to yield 3-cyano-4-isobutoxythiobenzamide. Cyclization of the thioamide group with 2-chloroacetoacetic acid ethyl ester in refluxing ethanol affords 2-(3-cyano-4-isoutoxyphenyl)-4-methylthiazole-5-carboxylic acid ethyl ester, which is hydrolyzed with sodium hydroxide to produce febuxostat.

Chemical PropertiesCrystalline Solid
OriginatorTeijin (Japan)
Usesantihyperlipidemic
UsesFebuxostat is primarily indicated in conditions like Gout, Hyperuricemia
UsesXanthine oxidase/xanthine dehydrogenase inhibitor. Used for treatment of hyperuricemia and chronic gout. 40-120 mg/day febuxostat was proven effective in lowering serum urate levels when administered to manage hyperuricemia in patients with gout.
DefinitionChEBI: Febuxostat is a 1,3-thiazolemonocarboxylic acid that is 4-methyl-1,3-thiazole-5-carboxylic acid which is substituted by a 3-cyano-4-(2-methylpropoxy)phenyl group at position 2. It is an orally-active, potent, and selective xanthine oxidase inhibitor used for the treatment of chronic hyperuricaemia in patients with gout. It has a role as an EC 1.17.3.2 (xanthine oxidase) inhibitor. It is an aromatic ether, a nitrile and a 1,3-thiazolemonocarboxylic acid.
Brand nameUloric, Adenuric
General DescriptionFebuxostat is a potent, non-purine compound, which inhibits the expression of cytokines/chemokines. It has also been reported to inhibit LPS-induced TNF-α, VCAM-1, MMP9 and MCP-1 expression.
Biochem/physiol ActionsFebuxostat is a potent non-purine xanithine oxidase inhibitor. Febuxostat is used in urate lowering therapies (ULTs) for the treatment of gout.
Clinical UseFabuxostat was discovered by Teijin Pharmaceuticals and licensed to TAP Pharmaceuticals (which is currently part of Takeda Pharmaceuticals) and was approved in the U.S. for the treatment of hyperuricemia in patients with gout. It is a once-daily non-purine based agent with potent inhibitory activity against xanthine oxidase. The safety profile of the drug also does not require dose adjustment for patients with mild to moderate renal or hepatic impairment. Febuxostat is the first new agent cleared for this indication in 40 years.
SynthesisThere are a number of routes available to prepare this agent as discussed in recent publications. The synthesis shown in Scheme 10 is a short and concise route and does not require the use of toxic reagents. Thus the commercially available and easily prepared 4-hydroxythiobenzamide (52) was reacted with ethyl bromoacetoacetate (53) in refluxing ethanol to provide the thiazole ester 54 in ??60% yield after crystallization. The phenolic ester 54 was then treated with hexamethylenetetramine (HMTA) in polyphosphoric acid at 80 ??C to provide the crude aldehyde 55 (74% conversion by HPLC). Reaction of phenol 55 and isobutyl bromide (56) in the presence of potassium carbonate with catalytic potassium iodide in DMF gave isobutyl ether 57 (64%, two steps). This ether was then converted in one pot to nitrile 58 in 93% by reacting the aldehyde with hydroxylamine hydrochloride and sodium formate in refluxing formic acid. Saponification of the ester 58 with aqueous sodium hydroxide provided fabuxostat (X).

Synthesis_144060-53-7

Drug interactionsPotentially hazardous interactions with other drugs Azathioprine: avoid concomitant use, increased risk of neutropenia. Cytotoxics: avoid concomitant use with mercaptopurine. Theophylline: use with caution
MetabolismExtensively metabolised by conjugation via the uridine diphosphate glucuronosyltransferase (UDPGT) enzyme system, and by oxidation via the cytochrome P450 isoenzyme system to form active metabolites. About 49% of a dose is excreted via the urine, and 45% via the faeces (12% as unchanged drug)
storageStore at RT
Febuxostat Preparation Products And Raw materials
2-[2-(2-AMINO-9H-PURIN-9-YL)ETHYL]-1,3-PROPANEDIOL Ethyl 2-(3-cyano-4-isobutoxyphenyl)-4-methyl-5-thiazolecarboxylate MONO-DESACETYL FAMCICLOVIR Methyl 4-Biphenylcarboxylic acid THIAZOLE ORANGE 4-METHYL-2-PHENYL-1,3-THIAZOLE-5-CARBOXYLIC ACID 2-Methoxy-5-methylbenzonitrile Febuxostat Methyl 4-cyanobenzoate 2-Ethoxybenzonitrile Thiophanate-methyl CARBOXYLIC ACID Thiazole 2-PROPOXYBENZONITRILE (4-METHYL-2-PHENYL-1,3-THIAZOL-5-YL)METHANOL Ethyl cyanoformate Cyano

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