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Losartan potassium

Description References
Losartan potassium
Losartan potassium structure
Chemical Name:
Losartan potassium
MK-95;MK 954;COZAAR;DUP 753;mk-0954;Aradois;l-158086;dupont753;thanolpotassium;DuP-753 potassium
Molecular Formula:
Formula Weight:
MOL File:

Losartan potassium Properties

Melting point:
storage temp. 
Inert atmosphere,Room Temperature
Freely soluble in water and in methanol, slightly soluble in acetonitrile.
powder or crystals
CAS DataBase Reference
124750-99-8(CAS DataBase Reference)
NCI Dictionary of Cancer Terms
Cozaar; losartan potassium
NCI Drug Dictionary
  • Risk and Safety Statements
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  26-36/37/39
WGK Germany  3
RTECS  NI6755100
HS Code  2933290000

Losartan potassium price More Price(11)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 61188 Losartan potassium analytical standard 124750-99-8 100mg $172 2021-03-22 Buy
Sigma-Aldrich Y0001062 Losartan potassium European Pharmacopoeia (EP) Reference Standard 124750-99-8 $190 2021-03-22 Buy
Sigma-Aldrich 1370462 Losartan potassium United States Pharmacopeia (USP) Reference Standard 124750-99-8 150mg $366 2021-03-22 Buy
TCI Chemical L0232 Losartan Potassium >98.0%(HPLC)(T) 124750-99-8 5g $144 2021-03-22 Buy
TCI Chemical L0232 Losartan Potassium >98.0%(HPLC)(T) 124750-99-8 25g $489 2021-03-22 Buy

Losartan potassium Chemical Properties,Uses,Production


As a angiotensin II receptor antagonist, Losartan Potassium is the potassium salt of losartan with antihypertensive activity, which is mainly used in the therapy of high blood pressure (hypertension) and diabetic nephropathy. It functions by relaxing blood vessels so that blood can flow more easily. It is also effective to help protect the kidneys from damage caused by diabetes and lower the risks of stroke in patients suffering from hypertension and myocardial enlargement. Besides, recent study has suggested that losartan is beneficial to reverse age related dysfunction in maintaining normal blood pressure and cellular energy usage on mitochondria and it can probably be used to treat left ventricular hypertrophy. It may also be used as an alternative agent for the treatment of systolic dysfunction, myocardial infarction, coronary artery disease, and heart failure.



Losartan potassium is the first potent and selective non-peptide angiotensin II (AT II) AT1 receptor antagonist introduced to the market as a once-daily oral antihypertensive. It is efficacious and long lasting in controlling blood pressure in spontaneous hypertensive rats, in patients with essential hypertension in addition to those patients with renal impairment. Since losartan functions by competitive antagonism at the level of receptor, which represents the most direct way of selectively inhibiting the renin-angiotensin system (RAS) independent of the source of AT II, its use has been reported to be free of the coughing side effect exhibited by the ACE inhibitors. In contrast to calcium channel blockers, losartan does not appear to cause ankle edema, headache and tachycardia. It is also reported to be in clinical trials for the treatment of heart failure. Other reports indicate that losartan may have potential efficacy as an anxiolytic, an antiglaucoma agent, in addition to in providing protection against stroke and in preventing the myointimal proliferative response of the vascular wall after coronary angioplasty and surgery.

Chemical Properties

White to Off-White Crystalline Powder


DuPont Merck (U.S.A.)


A nonpeptide angiotensin II AT1-receptor antagonist. Antihypertensive.


antihypertensive, AT1 angiotensin II antagonist


Coronary vasodilator used in the diagnosis of coronary heart disease (adenosine A2A agonist).

Manufacturing Process

2-Butyl-4-chloro-1-(2'-(tetrazol-5-yl)biphenyl-4-ylmethyl)-1H-imidazole-5- methanolpotassium was synthesized in 5 stages.
1. Methyl 4'-methylbiphenyl-2-carboxylate (44.2 mmol), 0.5 N KOH in methanol (133 mmol), and water (50 mL) were mixed and refluxed under nitrogen. After 5 hours, the solvent was removed in vacuo and water (200 mL) and ethyl acetate (200 mL) added. The aqueous layer was acidified with concentrated hydrochloric acid to a pH of 3 and the layers were separated. The aqueous phase was extracted with ethyl acetate, the organic layers collected, dried (MgSO4) and the solvent removed in vacuo to yield 8.71 g of a 4'-methylbiphenyl-2-carboxylic acid, melting point 140.0-145.0°C.
2. 4'-Methylbiphenyl-2-carboxylic acid (41 mmol) and thionyl chloride (411 mmol) were mixed and refluxed for 2 hours. The excess thionyl chloride was removed in vacuo and the residue was taken up in toluene. The toluene was removed by rotary evaporation. The crude acid chloride was then added slowly to cold (0°C) concentrated NH4OH (50 mL) so that the temperature was kept below 15°C. After 15 minutes of stirring, water (100 mL) was added and solids precipitated. These were collected, washed with water and dried under high vacuum over P2O5 to yield 7.45 g of a white solid, melting point 126.0-128.5°C. The above product amide (35 mmol) and thionyl chloride (353 mmol) were mixed and refluxed for 3 hours. The thionyl chloride was removed using the same procedure as described above. The residue was washed with a little hexane to yield 6.64 g of 4'-methyl-2-cyanobiphenyl, melting point 44.0- 47.0°C.
3. 4'-Methyl-2-cyanobiphenyl (5.59 g) was brominated using benzoyl peroxide as an initiator. The product was recrystallized from ether to yield 4.7 g of 4'- bromomethyl-2-cyanobiphenyl, melting point 114.5-120.0°C.
4. 4'-Bromomethyl-2-cyanobiphenyl (4.6 g) was alkylated onto 2-n-butyl-4- chloro-5-(hydroxymethyl)-imidazole. For separation of the product was used a flash chromatography in 1:1 hexane/ethyl acetate over silica gel. The regioisomeric products yielded 2.53 g of the faster eluting isomer. Recrystallization from acetonitrile yielded 1.57 g of analytically pure 2-n-butyl4-chloro-1-[2'-cyanobiphenyl-4-yl)methyl]-5-(hydroxymethyl)-imidazole, melting point 153.5 -155.5°C.
5. 2-n-Butyl-4-chloro-1-[(2'-cyanobiphenyl-4-yl)-methyl]-5-(hydroxymethyl)- imidazole (10 mmole), sodium azide (10 mmol), and ammonium chloride (30 mmol) were mixed in DMF (150 mL) under N2 at 100°C for 2 days, after which the temperature was raised to 120°C for 6 days. The reaction was cooled and 3 more equivalents each of ammonium chloride and sodium azide were added. The reaction was again heated for 5 days at 120°C. The reaction was cooled, the inorganic salts filtered, and the filtrate solvent removed in vacuo. Water (200 mL) and ethyl acetate (200 mL) were added to the residue and the layers were separated. The aqueous layer was extracted with ethyl acetate, the organic layers were collected, dried (MgSO4) and the solvent removed in vacuo, to yield a dark yellow oil. The product was purified by flash chromatography in 100% ethyl acetate to 100% ethanol over silica gel to yield 5.60 g of a light yellow 2-n-butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1Htetrazol-5-yl)biphenyl-4-yl)methyl]imidazole. Recrystallization from acetonitrile yielded 4.36 g of light yellow crystals which still melted broadly. The crystals were taken up in 100 mL of hot acetonitrile. The solid that did not dissolve was filtered off to yield 1.04 g of product as a light yellow solid, melting point of 2-n-butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1H-tetrazol-5-yl)biphenyl-4- yl)methyl]imidazole 183.5-184.5°C.
2-n-Butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1H-tetrazol-5-yl)biphenyl-4- yl)methyl]imidazole may be converted to potassium salt.

brand name

Cozaar (Merck).

Therapeutic Function


Biological Activity

Selective non-peptide angiotensin AT 1 receptor antagonist. Inhibits the contractile effects of angiotensin II on rabbit aorta and jugular vein (pA 2 = 8.27). Orally active antihypertensive agent.

Losartan potassium Preparation Products And Raw materials

Raw materials

Preparation Products

Losartan potassium Suppliers

Global( 413)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22607 55
Hubei XinRunde Chemical Co., Ltd.
02783214688 CHINA 567 55
Nanjing Finetech Chemical Co., Ltd.
025-85710122 17714198479
025-85710122 CHINA 890 55
+86 21 5161 9050/ 5187 7795
+86 21 5161 9052/ 5187 7796 CHINA 26734 60
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 3001 55
career henan chemical co
+86-371-86658258 CHINA 29959 58
Accela ChemBio Inc.
(+1)-858-876-1948 United States 19969 58
hdzhl biotechnology co., ltd
86-13032617415 CHINA 1275 58
Xiamen AmoyChem Co., Ltd
+86 592-605 1114 CHINA 6369 58
BOC Sciences
1-631-614-7828 United States 19753 58

View Lastest Price from Losartan potassium manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-10-27 Losartan potassium
2021-10-26 Losartan Potassium
US $0.00 / KG 2KG USP 20tons Sinoway Industrial co., ltd.
2021-10-20 Losartan potassium
US $1000.00 / KG 1KG 99% 9000kg/per week Hebei Lingding Biological Technology Co., Ltd

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