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Exemestane is a kind of irreversible nonsteroidal aromatase inhibitors, whose structure is similar to its substrate the natural androstenedione. It’s an effective and optional approach to treat postmenopausal women steroid-dependent breast cancer by inhibiting the aromatase to deprive estrogen. It’s used for advanced breast cancer of naturally or artificially postmenopausal women who have been treated with tamoxifen while the illness has yet to progress.
Exemestane Suppliers list
Company Name:Hubei XinyuanShun Chemical Co., Ltd.  Gold
Tel:13971561712 / 13995564702 / 027-50664929
Products Intro: Product Name:ExeMestane
Purity:99% Package:1kg;5kg;10kg;25kg
Company Name:Jinan Putubio Tech Co., Ltd.   Gold
Tel:+86 (531) 8099-2215
Products Intro: Product Name:ExeMestane(AroMasin)
Purity:99% HPLC Package:5KG;1KG,100G
Company Name:Wuhan DKY Technology Co.,Ltd.  Gold
Tel:027-81302011 15347069687;
Products Intro: CAS:107868-30-4
Purity:99% Package:1kg,5kg,25kg
Company Name:INTATRADE GmbH  
Tel:+49 3493/605464
Products Intro: Product Name:Exemestane Synonyms 6-Methylenandrosta-1,4-diene-3,17-dione; 10,13-Dimethyl-6-methylidene-7,8,9,10,11,12,13,14,15,16-decahydrocyclopenta[a]phenanthrene-
Company Name:3B Pharmachem (Wuhan) International Co.,Ltd.  
Tel:86-21-50328103 * 801、802、803、804 Mobile:18930552037
Products Intro: Product Name:ExeMestane;6-Methyleneandrosta-1,4-diene-3,17-dione
Purity:99% HPLC Package:1Mg ; 5Mg;10Mg ;100Mg;250Mg ;500Mg ;1g;2.5g ;5g ;10g
Exemestane Basic information
Introduction Function and Use Synthesis Indications Usage and dosage Adverse Reactions Contraindications Clinical assessment Attentions Drug interactions Specification Chemical properties Applications Producing method
Product Name:Exemestane
Product Categories:Active Pharmaceutical Ingredients;chiral;Antineoplastic (Hormonal);Intermediates & Fine Chemicals;Pharmaceuticals;Steroids;Pfizer compounds;Steroid and Hormone;API;Anti-cancer&immunity;Inhibitors
Mol File:107868-30-4.mol
Exemestane Structure
Exemestane Chemical Properties
mp 155.13°C
storage temp. Store at -20°C
CAS DataBase Reference107868-30-4(CAS DataBase Reference)
Safety Information
Hazard Codes T,N
Risk Statements 60-61-51
Safety Statements 53-22-36/37-57
Hazardous Substances Data107868-30-4(Hazardous Substances Data)
Exemestane Usage And Synthesis
IntroductionExemestane is a kind of irreversible nonsteroidal aromatase inhibitors, whose structure is similar to its substrate the natural androstenedione. It’s an effective and optional approach to treat postmenopausal women steroid-dependent breast cancer by inhibiting the aromatase to deprive estrogen. It’s used for advanced breast cancer of naturally or artificially postmenopausal women who have been treated with tamoxifen while the illness has yet to progress.
Function and UseExemestane, steroidal aromatase inactivator, whose structure is similar with natural substrate the androstenedione of aromatase, is the pseudosubstrate of aromatase. As postmenopausal women’s estrogen is mainly transferred under the effected by aromatase in peripheral tissues with androgen (produced in adrenal cortex), this product makes the aromatase inactive through combining the irreversible active site of aromatase, and hence to significantly reduce postmenopausal estrogen level in blood circulation. This product had no obvious effect on adrenal cortical hormone biosynthesis, even if the concentration is higher than 600 times the effect of aromatase inhibition concentration, it has also no obvious effect on other enzymes in cortical hormone production.
Oral absorption of this product is rapid, and the oral bioavailability is 42%, which is influenced by the food. In postmenopausal women, the absorption rate of the drug is higher than that of the healthy subjects, and the peak concentration of blood drug is 2 ~ 4 hours after oral administration. The peak time is 1.2 hours, and is shorter than that of healthy subjects (2.9 hours). The binding rate of total protein is 90%, which is mainly related to the α-acid glycoprotein and protein. Mainly through the liver metabolism, and the metabolite is inactive 17 - hydrogen exemestane, and elimination half-time is 24h. Primarily excreted by urine or feces, each accounting for 42% of the amount of dosis.
The above information is edited by the Chemicalbook He Liao Pu.
SynthesisTake androst-4-ene-3 and 17-dione (2) as raw material, firstly condense triethyl orthoformate, n-methylaniline and 40% formaldehyde solution to get 6-methylene androst-4-ene-3 and 17-dione (3), and then make dioxidation of 2,3-dichloro-5,6-DDQ to get 1. In the oxidative dehydrogenation reaction, the addition of a certain amount of weak acid can shorten the reaction time from 15h to 8h, and the yield can be increased from 47% to 62%. This method has mild reaction conditions, simple separation with total yield of 45%. The synthetic route is as follows:
IndicationsSuitable for estrogen and progesterone receptor positive postmenopausal women with advanced breast cancer.
Usage and dosage25mg for 1 time per day, oral admiration after meals. For patients with mild hepatic and renal insufficiency, it is not required to adjust the dosage of the drug.
Adverse ReactionsThe main adverse reactions of this product are nausea, dry mouth, constipation, diarrhea, dizziness, insomnia, skin rash, fatigue, fever, edema, increased pain, vomiting, abdominal pain, increased appetite, weight gain, etc. Furthermore it’s reported to cause high blood pressure, depression, anxiety, dyspnea, cough, etc. Also there is decrease of lymphocyte count and liver function (such as alanine aminotransferase) abnormality.
Contraindications1. Forbidden for patients allergic to this drug.
2. Forbidden for pregnant, lactation women, and kids.
Clinical assessmentExemestane is an oral potent irreversible steroidal aromatase inhibitor. Patients on tamoxifen resistant, exemestane 25mg, qd, can get 15% to 28% of objective efficiency and 69 to 76 weeks of continuous time. Exemestane is better than megestrol acetate, which can prolong the time of disease progression. For the deterioration of patient after megestrol acetate therapy, exemestane still can reach 11% ~ 13% objective efficiency. Exemestane 25 mg/d, for non-steroidal aromatase inhibitor treatment failure patients, the objective response rate is 6.6%; there is no cross resistance between those two drugs.
Attentions1.Premenopausal women generally do not use exemestane tablets.
2.Patients in severe liver and renal function insufficiency need to use it with caution. Excessive use of exemestane can lead to increased non-fatal adverse reaction.
3.Pregnancy safety grade of this drug in FDA is D grade.
4.No special attention for the elderly to use this drug.
Drug interactions1.This product can’t be combined with estrogen drugs, so as to avoid the effect of this product.
2.Exemestane mainly metabolized by CYP3A4, but when it’s in combination with potent CYP3A4 inhibitor (ketoconazole), pharmacokinetics of the product doesn’t change, therefore it seems that CYP isoenzyme inhibitors doesn’t have significant effect on pharmacokinetics of this product, but it does not rule out the possibility that the known CYP3A4 inducers decreases exemestane concentration in plasma.
SpecificationTablet: 25mg. Capsule: 25mg.
Chemical propertiesWhite solid, melting point 190 ~ 192℃.
Applications1.The second generation aromatase inhibitors, used for the treatment of metastatic breast cancer and used as adjuvant therapy for early breast cancer.
2.Pharmaceutical raw materials, is a kind of irreversible steroid body aromatase extinguishing agent, can inhibit the synthesis of estrogen, and reduce circulating estrogen levels, applicable to the progression of disease after treatment with tamoxifen in postmenopausal patients with advanced breast cancer.
Producing methodAndrost-4-ene-3, 17-dione (2) and triethyl orthoformate dissolved in tetrahydrofuran and anhydrous ethanol, reacting under the presence of p-toluenesulfonic acid, and then add into N-methyl aniline and formaldehyde solution to continue the reaction. The obtained Mannich reaction product dissolved in anhydrous benzoic acid and anhydrous two alkyl, under the action of DDQ, to get exemestane, and the total yield is 45%.
Chemical Propertieswhite to light yellow crystal powder
UsageAn antineoplastic (hormonal)
UsageLabeled Exemestane, intended for use as an internal standard for the quantification of Exemestane by GC- or LC-mass spectrometry.
Exemestane Preparation Products And Raw materials
Raw materialsEtanol-->Tetrahydrofuran-->Formaldehyde-->p-Toluenesulfonic acid-->Benzoic acid
Tag:Exemestane(107868-30-4) Related Product Information
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