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A kind of method for preparing topical antibiotic drug retapamulin

A technology for retamoline and a compound is applied in the field of preparing external antibiotic drug retamoline, which can solve the problems of increasing impurity research by drug manufacturers, affecting product quality of retamoline, and complex impurity spectrum of fermentation products, etc. The effect of easy industrial production, clear impurity spectrum and low preparation cost

Active Publication Date: 2020-07-14
CHONGQING HUABANGSHENGKAI PHARM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Regarding the preparation method of retapamulin, the starting materials used in the existing methods are all pleuromutilin, which is a bacterial fermentation product and is easily subject to monopoly control. Moreover, because the impurity spectrum of the fermentation product is complex and difficult to control, it affects The product quality of retapamulin also makes it more difficult for drug manufacturers to study impurities, and it is not conducive to the registration of new drugs

Method used

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  • A kind of method for preparing topical antibiotic drug retapamulin
  • A kind of method for preparing topical antibiotic drug retapamulin
  • A kind of method for preparing topical antibiotic drug retapamulin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The preparation of the compound shown in embodiment 1 formula III

[0064] The chemical name of the compound shown in formula III is (3aS, 4R, 6S, 8R, 9R, 9aR, 10R)-4,6,9,10-tetramethyloctahydro-8-hydroxyl-1-methoxy-6 - Vinyl-3a,9-propane-3aH-cyclopentacyclooctan-5-one.

[0065] Add 1.22kg of the compound of formula I and 7.5L of anhydrous methanol into a 50L double-layer glass reactor, under nitrogen protection, stir to dissolve, then add 1.18kg of trimethyl orthoformate, cool down; start adding concentrated sulfuric acid dropwise at 0-10°C, Keep warm at <15°C, drop it for about 1.0-1.5 hours, a total of 602.9g of concentrated sulfuric acid; heat up to an internal temperature of 45-50°C to react, and the reaction is completed in about 6.0-7.0 hours, stop heating, lower the temperature to 10-20°C, and start dripping Add 50% aqueous sodium hydroxide solution, control temperature <30°C, drop in about 1.0 hour, add 2.17kg of 50% aqueous sodium hydroxide solution dropwise;...

Embodiment 2

[0066] The preparation of embodiment 2 formula IV compound

[0067] The chemical name of the compound of formula IV is (3aS, 4R, 6S, 8R, 9R, 9aR, 10R)-4,6,9,10-tetramethyloctahydro-8-hydroxy-1-methoxy-6-ethylene Base-3a,9-propane-3aH-cyclopentacyclooctane-5-one-8-chloroacetate.

[0068] Add 2.4L of methyl tert-butyl ether and 210.0g of the compound of formula III into a 10L double-layer glass reactor, stir to dissolve, and the stirring speed is 200-300 rpm; the high and low temperature cycle machine cools down, and the temperature is controlled at -10 to - Pyridine (223.0g in total) was added dropwise at 15°C, and the dropwise addition was completed in about 15-20 minutes; the temperature was lowered, and the temperature was controlled at -20~-25°C, and a mixture of chloroacetyl chloride (146.0g) and 750ml methyl tert-butyl ether was added dropwise Liquid, a large amount of yellow-white solids are formed in the reaction kettle, and the dropwise addition is completed in about ...

Embodiment 3

[0069] The preparation of embodiment 3 formula V compound

[0070] The chemical name of the compound of formula V is (3aS, 4R, 5S, 6S, 8R, 9R, 9aR, 10R)-4,6,9,10-tetramethyloctahydro-5,8-hydroxyl-6-vinyl- 3a,9-Propane-3aH-cyclopentacyclooctan-1-one-8-chloroacetate.

[0071] Add 315.0g of the compound of formula IV and 1.58L of acetonitrile into a 10.0L reaction kettle, slowly drop into concentrated hydrochloric acid solution of zinc chloride (312.7g of zinc chloride dissolved in 945mL of concentrated hydrochloric acid) under temperature control at 5-15°C with stirring, about After 1.5-2.0 hours, the dropwise addition was completed, and then the temperature was raised to 40.0-50.0°C to react for 1.0-1.5 hours. After the reaction was completed, 2.0L of drinking water was added to quench the reaction, extracted with dichloromethane (2.5L*2), and the organic phases were combined and used for drinking Wash with water (3.0L*2); dry the organic phase with 1.0kg of anhydrous sodium s...

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Abstract

The invention provides a novel method for preparing an external-use antibiotic drug retapamulin. The novel method comprises the following steps: taking tiamulin as a starting raw material, and preparing retapamulin through five-step solid chemical reaction and a refining process. According to the novel method provided by the invention, quality of the starting raw material is controllable, so that the novel method is suitable for novel drug development and declaration. The novel method is simple to operate, is controllable in condition, is low in preparation cost, is convenient for industrial production, and is significant innovation for a retapamulin synthesis method.

Description

technical field [0001] The present invention relates to the preparation method of a class of important antibiotic medicine for external use, specifically, relate to the compound name [[(3-external)-8-methyl-8-azabicyclo[3.2.1]octane] -3-Mercapto]-,(3aS,4R,5S,6S,8R,9R,9aR,10R)-4,6,9,10-tetramethyl-5-hydroxy-6-vinyl decahydro-1- Preparation method of oxo-3a,9-propane-3aH-cyclopentacyclooctane-8-acetate. Background technique [0002] Retapamulin, chemical name [[(3-exo)-8-methyl-8-azabicyclo[3.2.1]octane]-3-mercapto]-,(3aS,4R,5S,6S ,8R,9R,9aR,10R)-4,6,9,10-Tetramethyl-5-hydroxy-6-vinyl decahydro-1-oxo-3a,9-propane-3aH-cyclopentacycline Alkane-8-acetate, a semi-synthetic truncated beifenglin antibiotic, can bind to a unique site on the bacterial ribosomal 50S subunit, block the ribosomal P region, and interfere with peptidyltransferase activity, thereby selectively inhibiting the synthesis of bacterial proteins and achieving antibacterial effects. On April 17, 2007, the FDA ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D451/04C07C69/63C07C67/08
CPCC07C45/65C07C67/08C07C69/63C07C319/20C07D451/02C07C323/52C07C49/753
Inventor 王帆占肖李红强杨玉金
Owner CHONGQING HUABANGSHENGKAI PHARM
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