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Sildenafil

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CAS:139755-83-2
Purity:99% Package:1KG;5KG;25KG
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CAS:139755-83-2
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CAS:139755-83-2
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CAS:139755-83-2
Purity:99% Package:100g/ bag, 2 kg/ bag, 25kg/ carton or as required Remarks:White crystalline powder
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CAS:139755-83-2
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Related articles

  • What is Sildenafil used for?
  • Sildenafil, the first US FDA-approved, oral phosphodiesterase type-5 inhibitor, has revolutionized the treatment of erectile d....
  • Dec 9,2019
Sildenafil Basic information
What is sildenafil? Uses Indications Side effects Overdose Genotoxicity Carcinogenicity
Product Name:Sildenafil
Synonyms:SILDENAFIL;5-[2-ethoxy-5-(4-methylpiperazin-1-yl-sulphonyl)phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7h-pyrazol[4,3d]pyrimidin-7-one;7H-Pyrazolo[4,3-d]pyriMidin-7-one, 5-[2-ethoxy-5-[(4-Methyl -1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-Methyl-3-propyl-;Sildenafil solution;5-{2-ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl}-1-methyl-3-propyl-1,4-dihydro-7H-pyrazolo[4,3-d] pyrimidin-7-one;5-[2-Ethoxy-5-[(4-methyl-piperazin-1-yl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one;5-(2-Ethoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one;5-[2-ethoxy-5-(4-Methylpiperazine-1-sulfonyl)phenyl]-1-Methyl-3-propyl-1H,6H,7H-pyrazolo[4,3-d]pyriMidin-7-one
CAS:139755-83-2
MF:C22H30N6O4S
MW:474.58
EINECS:604-158-7
Product Categories:TAMIFLU;pharmaceutical intermediates;Heterocycles;Intermediates & Fine Chemicals;Pfizer compounds;11;Active Pharmaceutical Ingredients;Miscellaneous Biochemicals;Sildenafil;Erectile Dysfunction;Pharmaceuticals;Sulfur & Selenium Compounds
Mol File:139755-83-2.mol
Sildenafil Structure
Sildenafil Chemical Properties
Melting point 187-189°C
density 1.39±0.1 g/cm3(Predicted)
Fp 9℃
storage temp. Sealed in dry,Store in freezer, under -20°C
pkapKa 8.7 (Uncertain)
InChIKeyBNRNXUUZRGQAQC-UHFFFAOYSA-N
CAS DataBase Reference139755-83-2(CAS DataBase Reference)
EPA Substance Registry System7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-[2-ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl- (139755-83-2)
Safety Information
Hazard Codes Xi,T,F
Risk Statements 36/37/38-39/23/24/25-23/24/25-11
Safety Statements 22-24/25-36-26-45-36/37-16-7
RIDADR UN1230 - class 3 - PG 2 - Methanol, solution
WGK Germany 1
HS Code 38220090
Hazardous Substances Data139755-83-2(Hazardous Substances Data)
Sildenafil Usage And Synthesis
What is sildenafil?Sildenafil (Viagra®) is an oral medication called a phosphodiesterase-5 (PDE5) inhibitor approved for the treatment of pulmonary arterial hypertension (PAH) in World Health Organization (WHO) Group 1 patients. The goal of this therapy is to improve exercise ability and delay clinical worsening. Research studies showing the effectiveness of the medication included mostly patients with symptoms that were rated as WHO Functional Class II-III.
Sildenafil is marketed as Revatio® for PAH and was approved by the United States Food and Drug Administration (FDA) in 2005. Sildenafil is also marketed as Viagra® which is FDAapproved for the treatment of erectile dysfunction but not for the treatment of PAH.
Uses

Sildenafil, the first US FDA-approved, oral phosphodiesterase type-5 inhibitor, has revolutionized the treatment of erectile dysfunction sine its approval in 1998. Since sildenafil is a potent inhibitor of cyclic guanosine monophosphate in the corpus cavernosum and therefore increases the penile response to sexual stimulation.

IndicationsSildenafil Citrate is an oral drug used to treat male erectile dysfunction and is a 5-phosphodiesterase inhibitor developed by the American Pfizer Pharmaceuticals to originally treat cardiovascular disease that was later discovered to improve patients'sex lives. Sildenafil Citrate treats erectile dysfunction and was the first clinical oral drug used to specifically target male erectile dysfunction.
Side effectsSildenafil is generally well tolerated. The most frequent side effects are:
Nose bleeds
Headache
Upset stomach and heartburn
Flushing of the skin
Difficulty sleeping
Worsening shortness of breath
Nasal congestion.
Other side effects include:
Fluid retention
Nausea and diarrhea
Pain in the extremity (arm or leg)
Temporary muscle aches
Fever
Numbness
A reduction in blood pressure throughout the body may occur because sildenafil relaxes blood vessels (arteries) throughout the body. Caution must be used in patients with low blood pressure, less than 90/50 mmHg for example. Caution is also needed in patients with dehydration, leftsided heart diseases and certain abnormalities of the body’s nervous system function.
Taking certain medications such as nitrates, nitric oxide donors or alpha blockers along with sildenafil can cause a significant drop in blood pressure. This could result in loss of consciousness or even death. You should make certain that you are not taking these medications before starting sildenafil. Use of sildenafil with medications known as nitrates is CONTRAINDICATED.
Prolonged erection (greater than four hours) in a male patient is a rare but very serious side effect; if this should happen to you, you should go to an emergency room or contact your doctor immediately.
Sudden loss of vision in one or both eyes has occurred in patients on PDE5 inhibitors. Such an event may represent serious dysfunction of the optic nerve and requires immediate medical attention.
Sudden loss of hearing may occur and may be accompanied by dizziness and/or ear ringing. Patients should seek prompt medical attention should this occur.
https://www.henryford.com/
OverdoseOverdose information is limited. In studies with healthy volunteers, of single doses up to 800 mg, adverse events were similar to those seen at lower doses but incidence rates and severities were increased.
In cases of overdose, standard supportive measures should be adopted as required. Sildenafil blood levels are not clinically useful. Monitor ECG and blood pressure in symptomatic patients. Renal dialysis is not expected to accelerate clearance as sildenafil is highly bound to plasma proteins and not eliminated in the urine.
Contact the Poisons Information Centre on 13 11 26 for advice on the management of an overdose.
https://www.pfizer.com.au/
GenotoxicitySildenafil was negative in in vitro bacterial and Chinese hamster ovary cell assays to detect mutagenicity, and in vitro human lymphocytes and in vivo mouse micronucleus assays to detect clastogenicity.
CarcinogenicitySildenafil was not carcinogenic when administered to rats for 24 months at a dose resulting in total systemic drug exposure (AUC) for unbound sildenafil and its major metabolite of 35- and 39-times, for male and female rats, respectively, the exposures observed in human males given the maximum recommended human dose (MRHD) of 100 mg. Sildenafil was not carcinogenic when administered to mice for 18-21 months at dosages up to the maximum tolerated dose of 10 mg/kg/day, but resulting in total systemic drug exposure for unbound sildenafil and its major metabolite of less than the exposures observed in human males given the MRHD.
DescriptionSildenafil was launched as Viagra in the US for the treatment of organic orland psychological male erectile dysfunction (ED). Sildenafil can be obtained by functional rearrangement of the corresponding 5-aryl 1,3-dialkyl pyrazolo[4,3- d]pyrimidin-7-one, itself synthesized in a seven-step sequence from a pyrazole- 5-carboxylate. Sildenafil is a potent and selective inhibitor of type V cGMP phosphodiesterases (PDE5) ; IC50 = 3nM on isozymes from human corpus cavernosum tissue. This orally-active therapy is completely new and presents advantages over the classically recommended options such as vacuum constriction devices, drug injection or prosthesis implantation ; for these reasons, this first drug is likely to have a large acceptance fot the treatment of male ED. In experiments with incubated rabbit penile tissue, Sildenafil was shown to cause accumulation of cGMP. By inhibiting the enzyme PDE5, the predominant isozyme in the corpus cavernosum, Sildenafil induces an elevation of levels of second messager cGMP, which is involved in the regulation of vascular tone ; it was suggested that the specific elevation of cGMP due to Sildefanil would mediate an enhancement of nitric oxide-dependent relaxation of corpus cavernosal tissue. Several clinical studies using 10-100 mg Sildenafil have confirmed a good effectiveness and tolerability in healthy males. New trials in women with sexual disfunction have been initiated and positive results could enlarge the potential market of this drug.
Chemical PropertiesWhite Solid
OriginatorPfizer (UK)
UsesSildenafil is a phosphodiesterase-5 (PDE5) inhibitor. It is indicated for the treatment of erectile dysfunction (ED).
IndicationsSildenafil (Viagra) is a selective inhibitor of PD-5, an enzyme that inactivates cGMP. Vardenifil (Levitra) is a particularly effective inhibitor of PD-5. It has a shorter onset of action and can be used in smaller doses than sildenafil. Other drugs used in the treatment of ED exert their effects through other biochemical pathways, both central and peripheral.
IndicationsSildenafil (Viagra) was developed more than 10 years ago as an antihypertensive and antianginal drug. It proved ineffective in these applications but was shown to affect the smooth muscles of the penis.
DefinitionChEBI: A pyrazolo[4,3-d]pyrimidin-7-one having a methyl substituent at the 1-position, a propyl substituent at the 3-position and a 2-ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl group at the 5-position.
Manufacturing ProcessA mixture of 3-n-propylpyrazole-5-carboxylic acid ethyl ester (24.1 g, 0.132 mol) (prepared by the method of Chem. Pharm. Bull., 1984, 32, 1568) and dimethyl sulfate (16.8 g, 0.133 mol) were heated to 90°C for 2.5 h. The mixture was dissolved in dichloromethane and the solution washed with sodium carbonate solution. The organic phase was separated, dried (MgSO4) and evaporated under vacuum to give a solid. Chromatography on silica gel (300 g), eluting with dichloromethane gave the 1-methyl-3-n-propylpyrazole- 5-carboxylic acid ethyl ester as a colourless oil (20.4 g, 79%).
1-Methyl-3-n-propylpyrazole-5-carboxylic acid ethyl ester (20.2 g, 0.10 mol) was suspended in 6 N aqueous sodium hydroxide solution (50 ml, 0.30 mol). The mixture was heated to 80°C for 2 h then diluted with water (50 ml) and acidified with concentrated hydrochloric acid (25 ml). Filtration gave the 1- methyl-3-n-propylpyrazole-5-carboxylic acid as pale brown crystals (12.3 g, 71%), melting point 150°-154°C.
1-Methyl-3-n-propylpyrazole-5-carboxylic acid (12.1 g, 0.072 mol) was added portionwise to a mixture of oleum (13 ml) and fuming nitric acid (11 ml), keeping the temperature below 60°C. After the addition, the mixture was heated at 60°C overnight and then cooled to room temperature before being poured onto ice. Filtration of the precipitate gave the 1-methyl-4-nitro-3-npropylpyrazole- 5-carboxylic acid as a white solid (11.5 g, 75%), melting point 124°-127°C.
1-Methyl-4-nitro-3-n-propylpyrazole-5-carboxylic acid (11.3 g, 0.053 mol) was added to thionyl chloride (50 ml) and the resulting mixture heated under reflux for 3 h. The reaction mixture was then cooled and excess thionyl chloride removed by evaporation under vacuum. The oily residue was dissolved in acetone (50 ml) and the solution cautiously added to a mixture of ice (50 g) and concentrated aqueous ammonium hydroxide solution (50 ml). The precipitate was collected by filtration to provide the 1-methyl-4-nitro-3-npropylpyrazole- 5-carboxamide as a pale yellow solid (8.77 g, 78%), melting point 141°-143°C.
1-Methyl-4-nito-3-n-propylpyrazole-5-carboxamide (3.45 g, 16.2 mmol) and stannous chloride dihydrate (18.4 g, 81 mmol) were suspended in ethanol and the mixture heated under reflux for 2 h. The resulting solution was cooled to room temperature, basified to pH 9 by the addition of 2 N aqueous sodium hydroxide solution and extracted with dichloromethane (3 x 150 ml). The organic extracts were combined, dried (MgSO4) and evaporated under vacuum. Trituration of the residue with ether gave the 4-amino-1-methyl-3-npropylpyrazole- 5-carboxamide as an off-white solid (2.77 g, 94%), melting point 98°-101°C.
A solution of 2-ethoxybenzoyl chloride (6.1 g, 33.0 mmol) in dichloromethane (50 ml) was added to a stirred solution of 4-amino-1-methyl-3-npropylpyrazole- 5-carboxamide (3.0 g, 16.4 mmol), 4-dimethylaminopyridine (0.02 g, 0.1 64 mmol) and triethylamine (3.34 g, 33.0 mmol) in dichloromethane (50 ml) at 0°C. The resulting mixture was allowed to warm to room temperature and stirred for a further 2 h. The solvent was evaporated under vacuum, the residue dissolved in a 19:1 mixture of dichloromethane and methanol (250 ml), and then the solution washed with 1 N hydrochloric acid (100 ml), dried (MgSO4) and evaporated under vacuum. The crude material was chromatographed on silica gel (200 g), eluting with a 97:3 mixture of dichloromethane and methanol, to give a pink solid; crystallisation from ethyl acetate-hexane gave the 4-(2-ethoxybenzamido)-1-methyl-3-npropylpyrazole- 5-carboxamide as a pale pink solid (2.2 g, 40%), melting point 153°-155°C.
4-(2-Ethoxybenzamido)-1-methyl-3-n-propylpyrazole-5-carboxamide (223 g, 0.676 mol) was added portionwise to a solution of sodium hydroxide (54 g, 1.35 mol) and 30% hydrogen peroxide solution (224 ml) in water (2000 ml). Ethanol (700 ml) was added and the resulting mixture heated under reflux for 2.5 h, cooled, then evaporated under vacuum. The resulting solid was treated with 2 N hydrochloric acid (380 ml), with external cooling, and the mixture was extracted with dichloromethane (1 x 700 ml, 3 x 200 ml). The combined organic extracts were washed successively with saturated aqueous sodium carbonate solution (3 x 400 ml) and brine (300 ml), then dried (Na2SO4) and evaporated under vacuum. Chromatography of the residue on silica gel (1000 g), using a methanol in dichloromethane elution gradient (0-1%), followed by trituration of the crude product with ether (300 ml), gave the 5-(2- ethoxyphenyl)-1-methyl-3-n-propyl-l,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin- 7-one as a colourless solid (152.2 g, 72%), melting point 143°-146°C.
5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-l,6-dihydro-7H-pyrazolo[4,3- d]pyrimidin-7-one (10.0 g, 32.1 mmol) was added portionwise to chlorosulfonic acid (20 ml) at 0°C under a nitrogen atmosphere. After being stirred overnight, the reaction solution was cautiously added to ice-water (150ml) and the aqueous mixture extracted with a 9:1 mixture of dichloromethane and methanol (4 x 100 ml). The combined extracts were dried (Na2SO4) and evaporated under vacuum to give the required 5-(5-chlorosulphonyl-2- ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin- 7-one as a white solid (12.8 g, 97%), melting point 179°-181°C.
4-Methylpiperidine was added to a stirred suspension of 5-(5-chlorosulphonyl- 2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3- d]pyrimidin-7-one in ethanol at room temperature. The resulting mixture was stirred for 4 days before removing the solvent by evaporation under vacuum. The residue was dissolved in a 9:1 mixture of dichloromethane and methanol and the solution washed with saturated aqueous sodium carbonate solution. The aqueous phase was further extracted with dichloromethane-methanol mixtures (3 x 100 ml) and all the organic fractions were combined, dried (MgSO4) and evaporated under vacuum to give a solid. Crystallisation from a mixture of methanol-dimethylformamide gave the 5-[2-ethoxy-5-(4- methylpiperidinylsulphonyl)phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7Hpyrazolo[ 4,3-d]-pyrimidin-7-one as an off-white solid, melting point 187°- 189°C.
After addition of citric acid to the 5-[2-ethoxy-5-(4- methylpiperidinylsulphonyl)phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7Hpyrazolo[ 4,3-d]-pyrimidin-7-one (sildenafil) the it's salt is obtained, namely sildenafil citrate.
Brand nameViagra (Pfizer);Segurex.
Therapeutic FunctionVasodilator
Mechanism of actionSildenafil is readily absorbed after oral administration and reaches peak plasma levels after about an hour. It undergoes hepatic metabolism and has a terminal half-life of about 4 hours.An initial dose of 50 mg is taken about an hour prior to sexual activity to induce penile erection.
Clinical UseSildenafil is a selective inhibitor of cGMP-specific PD-5 and therefore inhibits the degradation of cGMP. PD-5, the predominant type in the corpus cavernosum, also is present in other tissues (e.g., lungs, platelets, and eye). The selective inhibition of this enzyme facilitates the release of nitric oxide and smooth muscle relaxation of the corpus cavernosa. Sildenafil enhances erection by augmenting nitric oxide–mediated relaxation pathways. It has been suggested that sildenafil’s mechanism of action is due to cross-talk between cGMP- and cAMPdependent transduction pathways within the cavernous muscles.
Side effectsOrally administered sildenafil is an effective and well-tolerated treatment for men with ED, including those with diabetes mellitus. It has also been used for so-called salvage therapy in men who do not respond to intracorporeal injections of other agents. Headache is a common side effect, as are flushing and rhinitis.More serious side effects include definite or suspected myocardial infarctions and cardiac arrest.
Enzyme inhibitorSildenafil is rapidly absorbed and peaks in concentration (127–560 ng/mL) after 0.5 to 2.0 hours, displaying a half-life of 3 to 4 hours for the full therapeutic dose (25–100 mg). It is 96% bound to plasma proteins and is metabolized by the liver CYP3A4. The metabolite N-desmethylsildenafil possesses approximately 50% of the activity of the parent molecule.
MetabolismIn vitro metabolism studies for sildenafil have shown that the primary metabolite, N-desmethylsildenafil, and the minor metabolite, oxidative opening of the piperazine ring, are mediated by CYP3A4, CYP2C9, CYP2C19, and CYP2D6. The estimated relative contributions to clearance were 79% for CYP3A4, 20% for CYP2C9, and less than 2% for CYP2C19 and CYP2D6. These results demonstrate that CYP3A4 is the primary cytochrome mediating N-demethylation and that drugs inhibiting CYP3A4 likely impair sildenafil biotransformation and clearance. The pharmacokinetics of radiolabeled sildenafil were consistent with rapid absorption, first-pass metabolism, and primarily fecal elimination of N-demethylated metabolites. The absorption of sildenafil following oral administration was rapid (~92%), whereas the oral bioavailability was approximately 38% as a result of first-pass metabolism.
Tag:Sildenafil(139755-83-2) Related Product Information
N-DESMETHYL SILDENAFIL-D8 SILDENAFIL HYDROCHLORIDE 4-AMINO-1-METHYL-3-PROPYLPYRAZOLE-5-CARBOXAMIDE HYDROCHLORIDE Sildenafil Impurity 18 Sildenafil Impurity 82 Thiodimethyl Sildenafil (Dimethylthiosildenafil) 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide Methisosildenafil Sildenafil Aldehyde IMpurity 1H-Pyrazolo[4,3-d]pyriMidine, 7-ethoxy-5-[2-ethoxy-5-[(4- Methyl-1-piperazinyl)sulfonyl] phenyl]-1-Methyl-3-propyl- Iso Sildenafil 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,6-dihydro-5-(2-hydroxyphenyl)-1-methyl-3-propyl- 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,6-dihydro-1-methyl-5-[5-[2-(4-methyl-1-piperazinyl)acetyl]-2-propoxyphenyl]-3-propyl- N-Boc-N-desethyl Acetildenafil 1-Decarboxyl-1-(broMoacetyl) Norneovardenafil Sildenafil Impurity 25 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-[2-ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-6-ethyl-1,6-dihydro-1-methyl-3-propyl- Propoxyphenyl-thiohydroxyhomosildenafil