81403-68-1 Usage
Description
Alfuzosin hydrochloride, also known as Uroxatral, is a quinazoline derivative that functions as a uroselective alpha-1 adrenoreceptor antagonist. Structurally similar to prazosin, it is a pharmaceutical secondary standard used in quality control for pharmaceutical laboratories and manufacturers. Developed and launched worldwide by Sanofi-Synthelabo, it is primarily indicated for the treatment of benign prostatic hyperplasia (BPH).
Uses
Used in Pharmaceutical Industry:
Alfuzosin hydrochloride is used as an antihypertensive agent for the treatment of high blood pressure. It functions as an alpha-1 adrenergic antagonist, helping to relax blood vessels and improve blood flow.
Used in Urological Applications:
Alfuzosin hydrochloride is used as a treatment for benign prostatic hyperplasia (BPH). As an α1-adrenoceptor antagonist, it helps to improve urinary symptoms and reduce prostate size, providing relief to patients suffering from this condition.
Used in Quality Control:
Alfuzosin hydrochloride serves as a pharmaceutical secondary standard, offering a convenient and cost-effective alternative for the preparation of in-house working standards in pharmaceutical laboratories and manufacturing facilities. This ensures the quality and consistency of the drug in the production process.
Chemical Properties:
Alfuzosin hydrochloride is a white to off-white solid, with the brand name Uroxatral (Sanofi Aventis). It was launched as an extended-release formulation in the US in November 2003, utilizing Skyepharma's oral controlled-release technology.
Biological Activity
Functionally uro-selective α 1 adrenoceptor antagonist that does not discriminate between α 1 subtypes. Inhibits increases in intraurethral pressure caused by phenylephrine-induced contraction by 81% with minor cardiovascular effects. Also relaxes corpus cavernosum tissue (pIC 50 = 7.64) in vitro .
Biochem/physiol Actions
Alfuzosin hydrochloride is an alpha-adrenergic blocker used to treat benign prostatic hyperplasia (BPH). It works by relaxing the muscles in the prostate and bladder neck, making it easier to urinate.
Clinical Use
Alpha-blocker:
Treatment of benign prostatic hyperplasia
Treatment of acute urinary retention
Synthesis
Although
syntheses of alfuzosin (I) have appeared in several reports, an optimized route used for the manufacture of the compound does not appear in the literature. The synthesis
reported by the Sanofi group for alfuzosin will be described
and is shown in the scheme. The commercially available 4-
amino-2-chloro-6,7-dimethoxyquinazoline (1) was treated
with 3-methylaminopropionitrile (2) in isoamyl alcohol and
refluxed for 5 hrs. Filtration of the precipitated product and
washing with ethanol gave nitrile 3 in 62% yield.
Hydrogenation of the nitrile was done in 15% ammonia
solution in ethanol with Raney nickel as catalyst at 70°C
and 1000 psi to obtain the corresponding amine free base.
Conversion of the free base to the hydrochloride salt was
done in ethanol to give the HCl salt 4 in 52% yield. The
final acylation of amine 4 was done with the imidazolyl
anhydride of furan 5. Thus, 2-carboxyfuran was treated with
carbonyldiimidazole in THF at 40°C for 1 hr and then
cooled to 10°C. Addition of amine 4 in THF in the presence
of triethylamine at 10°C, then refluxing the reaction for 1 hr,
and aqueous workup gave the alfuzosin free base. After
conversion to the hydrochloride salt and recrystallization
from 2-propanol alfuzosin hydrochloride (I) was obtained in
44% yield.
Drug interactions
Potentially hazardous interactions with other drugs
Anaesthetics: enhanced hypotensive effect.
Antidepressants: enhanced hypotensive effect with
MAOIs.
Antivirals: concentration possibly increased by
ritonavir - avoid; avoid with telaprevir.
Avanafil, vardenafil, sildenafil and tadalafil: enhanced
hypotensive effect, separate administration by 4-6
hours.
Beta-blockers: enhanced hypotensive effect;
increased risk of first dose hypotensive effect.
Calcium-channel blockers: enhanced hypotensive
effect; increased risk of first dose hypotensive effect.
Cobicistat: concentration of alfuzosin possibly
increased - avoid.
Diuretics: enhanced hypotensive effect; increased
risk of first dose hypotensive effect.
Moxisylyte: possibly severe postural hypotension.
Metabolism
Extensively metabolised in the liver, mainly by the
cytochrome P450 isoenzyme CYP3A4, to inactive
metabolites that are mainly excreted in faeces via the bile.
Check Digit Verification of cas no
The CAS Registry Mumber 81403-68-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,4,0 and 3 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 81403-68:
(7*8)+(6*1)+(5*4)+(4*0)+(3*3)+(2*6)+(1*8)=111
111 % 10 = 1
So 81403-68-1 is a valid CAS Registry Number.
InChI:InChI=1/C19H27N5O4.ClH/c1-24(8-5-7-21-18(25)14-6-4-9-28-14)19-22-13-11-16(27-3)15(26-2)10-12(13)17(20)23-19;/h10-11,14H,4-9H2,1-3H3,(H,21,25)(H2,20,22,23);1H
81403-68-1Relevant articles and documents
Improved method used for preparing quinazoline drugs
-
, (2018/07/06)
The invention relates to an improved method used for preparing quinazoline drugs, and provides a synthesis route taking 2-chloro-4-amino-6,7-dimethoxyquinazoline as an intermediate. The synthesis route comprises following steps: acrylonitrile and a methylamine alcohol solution are subjected to amination reaction so as to obtain intermediate (I); triethylamine is taken as an acid binding agent, andbenzyl chloride is taken as a protective group so as to obtain an intermediate (II); a metal hydride is adopted so as to obtain an intermediate (III) through reduction; acylation with tetrahydro-2-furancarbonylchloride is carried out so as to obtain an intermediate (IV); the intermediate (IV) and ammonium formate are subjected to hydrogenolysis under catalytic effect of palladium on carbon so asto obtain an intermediate (V); and at least condensation reaction with 2-chloro-4-amino-6,7-dimethoxyquinazoline is carried out so as to obtain quinazoline drug Alfuzosin Hydrochloride (VI). Comparedwith the prior art, the improved method possesses following advantages: operation is simple and safe; reaction conditions are convenient to control; energy consumption is low; yield is stable; and industrialized application prospect is promising.
Process for the Preparation of Alfuzosin Hydrochloride
-
Page/Page column 8, (2010/10/19)
A process for preparing alfuzosin or a salt thereof comprising: (a) condensing 4-amino-2-chloro-6,7-dimethoxyquinazoline with 3-methylaminopropionitrile in the presence of a polar aprotic solvent selected from the group consisting of diglyme, dimethyl formamide, t-butanol, hexamethylphosphoramide or mixtures thereof to form N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methyl-2-cyanoethylamine (b) hydrogenating the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methyl-2-cyanoethylamine using a hydrogenating agent under a pressure of less than 10 kg/cm2 to form N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine and optionally converting the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine to an acid addition salt thereof; and (c) converting tetrahydrofuroic acid to an intermediate form and condensing the intermediate form with the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine or with the acid addition salt to yield alfuzosin base, and optionally converting alfuzosin base to a salt of alfuzosin.
AN IMPROVED PROCESS FOR THE PREPARATION OF ALFUZOSIN AND ITS NOVEL POLYMORPH
-
Page/Page column 10, (2009/03/07)
The present invention relates to an improved process for the preparation of Alfuzosin of formula (I). The process involves utilizing intermediate of formula (Ia) wherein S represents acid residue of organic acids like acetic acid, oxalic acid, succinic acid, methane sulfonic acid, p-toluene sulfonic acid and the like. The present invention also relates to novel Amorphous form of Alfuzosin of formula (I).