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Levofloxacin hydrochloride

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Company Name: Shaanxi Yikanglong Biotechnology Co., Ltd.
Tel: 17791478691
Products Intro: Product Name:Levofloxacin hydrochloride
Purity:99%(Customizable specifications) Package:1KG;1USD Remarks:Factory stock, quality assurance, price concessions
Company Name: Wuhan Fortuna Chemical Co., Ltd
Tel: 86-27-59207850
Products Intro: Product Name:Levofloxacin hydrochloride
Purity:98%-102% Package:1Kg/Bag|25Kg/Drum
Company Name: Henan Tianfu Chemical Co.,Ltd.
Tel: 0371-55170693
Products Intro: Product Name:100986-85-4
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Company Name: Hangzhou FandaChem Co.,Ltd.
Tel: 008615858145714
Products Intro: Product Name:Levofloxacin
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Company Name: Guangzhou PI PI Biotech Inc
Tel: ; +8618371201331;+8618371201331
Products Intro: Product Name:Levofloxacin
Purity:90%+ Package:10mg, 25mg, 50mg, 100mg, Other scale please email Remarks:(3S)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid

Levofloxacin hydrochloride manufacturers

Levofloxacin hydrochloride Basic information
Product Name:Levofloxacin hydrochloride
Synonyms:(s)-ofloxacin;7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-, (S)-;Cravit;HR 355;Levaquin;RWJ 25213-097;Tavanic;(-)-(S)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazin-yl)-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid
Product Categories:Peptide Synthesis/Antibiotics;Pharmaceutical intermediate;Active Pharmaceutical Ingredients;Antibiotics for Research and Experimental Use;Biochemistry;Quinolones (Antibiotics for Research and Experimental Use);Pharmaceutical material and intermeidates;Anti-Infective;Antimicrobial;API;Pharmaceutical intermediates;Inhibitors
Mol File:100986-85-4.mol
Levofloxacin hydrochloride Structure
Levofloxacin hydrochloride Chemical Properties
Melting point 218°C
Boiling point 572℃
density 1.48±0.1 g/cm3(Predicted)
Fp >110°(230°F)
storage temp. Keep in dark place,Sealed in dry,2-8°C
solubility chloroform: soluble10mg/mL
form powder
color white to faint yellow
optical activity[α]20/D -104±4° in chloroform
Water Solubility Slightly soluble in water or methanol. Soluble in glacial acetic acid or dichloromethane
Sensitive Light Sensitive
Merck 14,6771
BRN 7327015
CAS DataBase Reference100986-85-4(CAS DataBase Reference)
EPA Substance Registry System7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-, (3S)- (100986-85-4)
Safety Information
Hazard Codes Xn
Risk Statements 22-42/43-68-20/21/22-64-63
Safety Statements 26-36/37/39-36
WGK Germany 3
RTECS UU8815550
HS Code 29349990
Hazardous Substances Data100986-85-4(Hazardous Substances Data)
ToxicityLD50 oral in rat: 1478mg/kg
MSDS Information
Levofloxacin hydrochloride Usage And Synthesis
DescriptionLevofloxacin, the optically active S-isomer of the fluoroquinolone antibiotic ofloxacin, is two to four times more potent than ofloxacin with reportedly less side effects in treating infections of the lower respiratory and urinary tract, prostate infections and sexually transmitted diseases. It has broad and potent antibacterial activity over common Grampositive and -negative aerobic pathogens and obligate anaerobes. Different from the cephem antibiotics, levofloxacin is unique in its marked selectivity against members of the family Enterobacteriaceae and its negligible effect on predominant anaerobes. Levofloxacin also exhibits satisfactory antimicrobial effects in surgical infections and it may be used for treatment of gastrointestinal infections such as traveler’s diarrhea associated with the pathogenic Enterobacteriaceae.
Chemical PropertiesSlight yellow powder
OriginatorDaiichi (Japan)
UsesLevofloxacin is a broad-spectrum antibiotic used in pharmacokinetic?, antibiotic resistance?, and resistance prevention?studies. Levofloxacin is active against Gram-positive and Gram-negative bacteria. It inhibits DNA gyrase (type II topoisomerase) and topoisomerase IV, thereby inhibiting cell division.
Manufacturing Process()-3-Acetoxymethyl-7,8-difluoro-2,3-dihydro-4H-[1,4]benzoxazine (m.p. 73- 74°C) was synthesized by hydrogenation of a compound prepared from 2,3- difluoro-6-nitrophenol, 1-acetoxy-3-chloro-2-propane and potassium iodide. The hydrogenation was carried out on Raney nickel. The resulting compound was dissolved in THF, and 3,5-dinitrobenzoyl chloride and pyridine were added thereto, followed by heating at 60°C for 3 hours. The mixture was concentrated, and the concentrate was dissolved in ethyl acetate, washed successively with diluted hydrochloric acid, an aqueous solution of sodium bicarbonate and water, dried over anhydrous sodium sulfate and concentrated. Addition of n-hexane to the concentrate caused precipitation of yellow crystals of a racemate. The yield of 3,5-dinitrobenzoyl derivative of the ()-3- acetoxymethyl-7,8-difluoro-2,3-dihydro-4H-[1,4]benzoxazine 3.93 g.
To 2.0 ml of Amberlite XAD 7 was added 2.0 ml of a 0.05 M phosphoric acid buffer (pH 7.0) having dissolved therein 20 mg of lipoprotein lipase, and the system was allowed to stand at room temperature for 18 hours to thereby adsorb the enzyme onto the resin. The resin was filtered. A solution of 250 mg of 3,5-dinitrobenzoyl derivative of ()-3-acetoxymethyl-7,8-difluoro-2,3- dihydro-4H-[1,4]benzoxazine as a substrate in 25 ml of a mixed solvent of benzene and n-hexane (4:1 by volume) was added to the resin, followed byallowing to react at 37°C for 4 hours. It was obtained 117 mg of a 3,5- dinitrobenzoyl derivative of the (-)-3-acetoxymethyl-7,8-difluoro-2,3-dihydro- 4H-[1,4]benzoxazine and 65 mg of a derivative of the (-)-3-acetoxymethyl- 7,8-difluoro-2,3-dihydro-4H-[1,4]benzoxazine.
In 135 ml THF was dissolved 3.03 g of a 3,5-dinitrobenzoyl derivative of (-)- 3-acetoxymethyl-7,8-difluoro-2,3-dihydro-4H-[1,4]benzoxazine, and 135 ml of ethanol and 30 ml of 1.0 N potassium hydroxide were added to the solution. After 30 min 3 ml of acetic acid was added thereto for neutralization. The mixture was concentrated. The solid was subjected to column chromatography using 40 g of silica gel and eluted with chloroform/methanol to obtain 1.17 g of (-)-7,8-difluoro-2,3-dihydro-3-hydroxymethyl-4H-[1,4]benzoxazine; [α]D22 = -14.1° (c = 1.80, CHCl3).
To 1.17 g of (-)-7,8-difluoro-2,3-dihydro-3-hydroxymethyl-4H-[1,4] benzoxazine was added 2.77 g of thionyl chloride in pyridine. The reaction mixture was concentrated and the concentrate was subjected to column chromatography using 40 g of silica gel and eluted with chloroform to obtain 1.18 g of the reaction product as a colorless oily product. This product was dissolved in 30 ml of dimethyl sulfoxide, and 0.41 g of sodium borohydride was added thereto, followed by heating at 80-90°C for 1 hour. The reaction mixture was dissolved in 500 ml of benzene, washed with water to remove the dimethyl sulfoxide, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The concentrate was subjected to column chromatography using 40 g of silica gel and eluted with benzene to obtain 0.80 g of (-)-7,8-difluoro-2,3-dihydro-3-methyl-4H-[1,4]benzoxazine as a colorless oily product; [α]D25 = -9.6° (c = 2.17, CHCl3). Optical Purity: >99% e.e.
To 1.13 g of (-)-7,8-difluoro-2,3-dihydro-3-methyl-4H-[1,4]benzoxazine was added 1.58 g of diethyl ethoxymethylenemalonate, and the mixture was stirred at 130-140°C for 70 min. The reaction mixture was subjected to column chromatography using 50 g of silica gel and eluted with chloroform to obtain 2.47 g of diethyl [(-)-7,8-difluoro-3-methyl-2,3-dihydro-4H-[1,4] benzoxazin-4-yl]methylenemalonate. This product was dissolved in 5 ml of acetic anhydride, and 10 ml of a mixture of acetic anhydride and concentrated sulfuric acid (2/1 by volume) with stirring under ice-cooling, followed by stirring at 50-60°C for 40 min. To the reaction mixture were added ice and an aqueous solution of sodium bicarbonate, and the product was extracted three times with 150 ml portions of chloroform. The combined extract was washed with water, dried over anhydrous sodium sulfate and concentrated. The precipitate was washed with a small amount of diethyl ether to yield 1.32 g of (-)-ethyl 9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4] benzoxazine-6-carboxylate.
In 12 ml of acetic acid was dissolved 1.20 g of the resulting compound, and 25 ml of concentrated hydrochloric acid was added, followed by refluxing at 120-130°C for 90 min. Upon allowing the reaction mixture to stand at room temperature, colorless crystals were precipitated, which were collected by filtration and washed successively with a small amount of water, ethanol and diethyl ether to obtain 0.96 g of (-)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro- 7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid.
In 30 ml of diethyl ether was suspended 324 mg of the resulting compound,and a large excess of boron trifluoride ethyl etherate was added thereto, followed by stirring at room temperature for 30 min to form a chelate compound. The product was collected by filtration and washed with a small amount of diethyl ether to obtain 373 mg of a powder. The powder was dissolved in 7 ml of dimethyl sulfoxide, and 136 mg of N-methylpiperazine and 228 mg of triethylamine were added thereto, followed by stirring at room temperature for 17 hours. The reaction mixture was concentrated to dryness under reduced pressure, and to the solid were added 15 ml of 95% methanol and 0.31 ml of triethylamine. The resulting mixture was refluxed for 3 hours. The reaction mixture was concentrated under reduced pressure, and the residue was filtered and washed successively with a small amount of ethanol and diethyl ether to obtain 350 mg of a white powder. Recrystallization from a mixed solvent of ethanol and thick aqueous ammonia gave 230 mg of S-(-)- ofloxacin (Levofloxacin).
Melting Point: 225-227°C (with decomposition); [α]D23 = -76.9° (c = 0.39, 0.05 N NaOH).
Brand nameIquix (Sanofi Winthrop); Levaquin (Ortho-McNeil); Quixin (Sanofi Winthrop);Cravit.
Therapeutic FunctionAntibacterial
Antimicrobial activityLevofloxacin is the active component of ofloxacin; d-ofloxacin is without significant antibacterial activity. It exhibits good activity in vitro against Gram-positive cocci (including Str. pneumoniae), Enterobacteriaceae, some fastidious Gram-negative bacilli and Ps. aeruginosa as well as chlamydiae, Mycoplasma pneumoniae, L. pneumophila and M. tuberculosis. MICs for Acinetobacter spp. and Sten. maltophilia are 0.06–0.25 and 0.5–2.0 mg/L, respectively. Activity against anaerobes is moderate to low.
Pharmaceutical ApplicationsFor molecular weight and structure, see ofloxacin . Levofloxacin is the l-isomer of ofloxacin.
PharmacokineticsOral absorption: >95%
Cmax 500 mg oral: c. 5 mg/L after 1.5–2 h
750 mg oral: c. 8 mg/L after 1.5–2 h
500 mg intravenous (90-min infusion): c. 6 mg/L end infusion
750 mg intravenous (90-min infusion) :c. 12 mg/L end infusion
Plasma half-life :6–8 h
Volume of distribution:0.6–0.8 L/kg
Plasma protein binding: <25%
Co-administration with antacids, calcium, sucralfate and heavy metals decreases bioavailability and AUC. No interactions with warfarin or theophylline have been observed. Co-administration of a non-steroidal anti-inflammatory drug may increase the risk of convulsions. It undergoes limited metabolism and is primarily eliminated unchanged in urine by both glomerular filtration and tubular secretion. The free AUC:MIC ratio for Str. pneumoniae increases from about 55 to 70 when the daily dosage is raised from 500 mg to 750 mg.
It is stable in plasma and does not revert to d-ofloxacin. It undergoes limited metabolism and is primarily eliminated unchanged in the urine. Renal clearance in excess of the glomerular filtration rate suggests that tubular secretion also occurs. Concomitant administration of either cimetidine or probenecid reduces renal clearance by approximately onethird. Clearance is reduced and half-life is prolonged in patients with impaired renal function (creatinine clearance <50 mL/min) requiring dosage adjustment in such patients.
Clinical UseAcute bacterial sinusitis
Acute bacterial exacerbations of chronic bronchitis, community-acquired pneumonia
Uncomplicated and complicated skin and skin structure infections
Uncomplicated and complicated urinary infections including acute pyelonephritis
Chronic bacterial prostatitis
Side effectsSide effects have been reported in 6–7% of patients and include fever, rash and other events common to the group. Elderly patients are at increased risk of developing severe tendon disorders including rupture, a risk increased by concomitant corticosteroid therapy.
Tag:Levofloxacin hydrochloride(100986-85-4) Related Product Information
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