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Method for preparing azithromycin and method for preparing intermediate of azithromycin

A technology of azithromycin and erythromycin, applied in the field of preparation of azithromycin, can solve the problems of high dosage of reducing agent sodium borohydride, low yield of azithromycin, high price of azithromycin, etc., and achieve moderate dosage of reducing agent, lower cost and yield high effect

Active Publication Date: 2010-05-26
BEIJING RED SUN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is the defect that the yield of azithromycin in the prior art is not high, the reduction requires a noble metal as a catalyst, or the amount of reducing agent sodium borohydride is too high, resulting in high cost, thus making azithromycin expensive. A kind of preparation method of azithromycin and the preparation method of its intermediate

Method used

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  • Method for preparing azithromycin and method for preparing intermediate of azithromycin
  • Method for preparing azithromycin and method for preparing intermediate of azithromycin
  • Method for preparing azithromycin and method for preparing intermediate of azithromycin

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Embodiment 1

[0036] The preparation of embodiment 1 erythromycin A9-oxime

[0037] Add 40g of hydroxylamine hydrochloride and 120g of methanol into a 500ml reaction flask, add 40g of triethylamine dropwise (about 40 minutes), raise the temperature to 40°C and stir for three hours, add a buffer solution with a molar ratio of triethylamine and acetic acid of 1:2 to control When the pH value is 5-8, add 100 g of erythromycin thiocyanate (the content of erythromycin thiocyanate A is 80%), react for 5 hours, heat up and reflux for 18 hours, cool down to 20°C, and drip 100 g of water within 30 minutes. -200ml, stirred for 30 minutes and filtered to obtain oxime salt, washed with water. Add dichloromethane and water, adjust the pH value to 9-11 with 10% aqueous sodium hydroxide solution, and let stand to separate layers. The upper aqueous layer was extracted once more with dichloromethane, and the dichloromethane layers were combined. Add water, evaporate dichloromethane, cool down in ice bath,...

Embodiment 2

[0038] The preparation of embodiment 2 erythromycin A9-oxime

[0039] Add 40 g of hydroxylamine hydrochloride, 120 g of methanol into a 500 ml reaction flask, add 40 g of diethylamine dropwise (about 40 minutes), raise the temperature to 40°C and stir for three hours, add a buffer with a molar ratio of diethylamine:acetic acid of 1:2 Control the pH value of the solution at 5-8, add 100 g of erythromycin thiocyanate (the content of erythromycin thiocyanate A is 80%), react for five hours, heat up and reflux for 18 hours, cool down to 20°C, and drip water within 30 minutes 100-200ml, stirred for 30 minutes, filtered to obtain oxime salt, washed with water. Add dichloromethane and water, adjust the pH value to 9-11 with 10% aqueous sodium hydroxide solution, and let stand to separate layers. The upper aqueous layer was extracted once more with dichloromethane, and the dichloromethane layers were combined. Add water, evaporate dichloromethane, cool down in ice bath, filter, wash...

Embodiment 3

[0040] Embodiment 3 erythromycin A6, the preparation of 9-imine ether

[0041] Add 80g of erythromycin A9-oxime and 30g of alkaline agent sodium bicarbonate into a 1000ml reaction flask, add 100mL of water and 100mL of dichloromethane each, lower the temperature below 25°C, add 50g of methanesulfonyl chloride dropwise, and finish the dropwise addition within half an hour. Insulation reaction, standing for stratification, extracting the organic layer with water twice, combining the water layers, adjusting the pH value to above 11 with 10% sodium hydroxide solution and stirring for one hour, cooling in an ice bath, suction filtration, washing with water to obtain the product, and drying , about 74.4g, the yield is 93%, the HPLC purity content is 93% after detection, and the moisture content is less than 5%.

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Abstract

The invention discloses a method for preparing azithromycin. The method comprises the following steps of: in acid aqueous solution and under an action of potassium borohydride, performing the reduction reaction of erythromycinA6, 9-imine ether represented by a formula II, then performing methylation reaction, and putting the reaction products in a mixed solvent of water and halogenated hydrocarbons for hydrolysis reaction so as to obtain the azithromycin represented by a formula I. In the method, the reducer is properly consumed, the yield is high, and the cost of the preparation of the azithromycin is obviously reduced. The invention also relates to a method for preparing the erythromycinA6, 9-imine ether and erythromycinA9-oxime.

Description

technical field [0001] The invention relates to a preparation method of azithromycin and a preparation method of an intermediate thereof. Background technique [0002] Azithromycin is a macrolide antibiotic with a broad antibacterial spectrum and has antibacterial effects on a variety of microorganisms (such as Haemophilus, Streptococcus, Mycoplasma, Staphylococcus aureus, Mycobacterium avium, etc.). The preparation method of azithromycin reported in the literature is usually obtained through semi-synthesis with erythromycin A as a raw material, mainly including the following steps: erythromycin A is converted into erythromycin A9-oxime by reacting with hydroxylamine hydrochloride; Beckmann rearrangement is converted into erythromycin A6, 9-imine ether; erythromycin A6, 9-imine ether is reduced to 9-deoxy-9a-aza-9a-cis erythromycin A, and further Methylation, hydrolysis to get azithromycin. [0003] WO94 / 26758 reports the preparation method of erythromycin A9-oxime, erythr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H17/00C07H1/00
Inventor 吴范宏杨波杨雪艳俞晓东
Owner BEIJING RED SUN PHARMA
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