Ornidazole optical antimer preparation and purification method

An ornidazole optical and enantiomer technology is applied in the field of preparation and purification of ornidazole optical enantiomer, can solve the problems of inapplicability to large-scale production, high cost and the like, and achieves the effect of easy operation

Active Publication Date: 2006-07-12
NANJING SANHOME PHARMACEUTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prior art has left-handed and right-handed ornidazole (seeing CN 1400312A) from the ornidazole racemate by enzymatic resolution, but the required cost of ornidazole optical enantiomer is obtained by this method, and it is not necessary suitable for mass production

Method used

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  • Ornidazole optical antimer preparation and purification method
  • Ornidazole optical antimer preparation and purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 500 liters of ethyl acetate and 52.5 kg of 2-methyl-5-nitroimidazole into a dry 1000-liter enamel reaction pot, stir and drop to 0°C, add 80 kg of aluminum chloride into the reaction pot in batches, Control the temperature not to exceed 10°C, cool down to 5°C after the addition, and keep stirring for 1 hour; add 50 liters of S-(+)-epichlorohydrin dropwise into the reaction pot, control the temperature not to exceed 10°C, 5-10 ℃ heat preservation reaction for 2.5 hours; slowly add 300 liters of ice water to the reaction solution, control the temperature not to exceed 30 ℃, after the addition is completed, 20-30 ℃ heat preservation reaction for 1 hour; filter the reaction liquid, and the filtrate is allowed to stand and separate Take the organic phase and add 200 liters of water, then stir and add about 50 liters of concentrated hydrochloric acid to make the pH value 1.0, let it stand for stratification, take the water phase and add 500 liters of ethyl acetate, add amm...

Embodiment 2

[0022] Put 500 liters of ethyl acetate and 52.5 kilograms (kg) of 2-methyl-5-nitroimidazole into a dry 1000-liter enamel reaction pot, stir it down to 0 °C, and add 80 kg of ferric chloride to the reaction pot in batches Inside, control the temperature not to exceed 10°C, cool down to 5°C after the addition, and keep stirring for 1 hour; add 50 liters of R-(-)-epichlorohydrin dropwise into the reaction pot, control the temperature not to exceed 10°C, add After the completion of the reaction at 5-10 ° C for 3 hours; slowly add 300 liters of ice water to the reaction solution, control the temperature not to exceed 30 ° C, after the addition is completed, keep the reaction at 20-30 ° C for 1.5 hours; filter the reaction solution and let the filtrate stand Layering, take the organic phase and add 200 liters of water, then stir and add about 50 liters of concentrated hydrochloric acid to make the pH value 1.5, let it stand for stratification, take the water phase, add 500 liters of ...

Embodiment 3

[0024] Purification of products. Put 200 grams (g) of S-(-)-ornidazole crude product (impurity 13%) and 2000 milliliters of toluene into the reaction flask as prepared in Example 1, stir and heat up to 60 ° C, keep stirring for 15 minutes and then filter while hot , the filtrate was placed at -5°C for 12 hours to crystallize, filtered to obtain 160g of solid (impurity 2%), put the dried solid and 128 ml of 75% ethanol into the reaction flask, stirred and raised the temperature to 55°C, and added activated carbon after the solid was dissolved 2 g, kept stirring for 20 minutes and then filtered while hot. The filtrate was placed at 5°C for 12 hours to crystallize, filtered, and the resulting solid was rinsed with cold ethanol and dried to obtain 112 g of S-(-)-ornidazole (0.2% impurity).

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Abstract

The invention provides a method for preparing and purifying the optics enantiomer, which uses the 2-methyl -5-nitramisole to react with the chloropropylene oxide (S-(+)-chloropropylene oxide or R-(-) - chloropropylene oxide) to obtain the intermediate with optics activity then obtain the optics activity azoles by hydrolyzing, acidifying and inactivating then obtain the pure S-(-)-azoles or R-(+)-azoles by purifying.

Description

technical field [0001] The invention relates to a method for preparing and purifying optical antipodes of ornidazole. Background technique [0002] Ornidazole (CAS 16773-42-5), a nitroimidazole derivative, is a powerful drug against anaerobic bacteria and antiprotozoal infections. It is also a newly developed drug after metronidazole with higher efficacy and shorter treatment course , The third generation of nitroimidazole derivatives with better tolerance and wider distribution in the body. Its chemical name is 1-(3-chloro-2-hydroxypropyl)-2-methyl-5-nitroimidazole, molecular formula: C 7 h 10 ClN 3 o 3 , molecular weight: 219.6. The antimicrobial effect of ornidazole is through the reduction of the nitro group in its molecule to an amino group in an oxygen-free environment, or through the formation of free radicals to interact with cell components, resulting in the death of microorganisms. Prior art has left-handed and right-handed ornidazole (seeing CN 1400312A) fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/94
Inventor 张仓张文萍
Owner NANJING SANHOME PHARMACEUTICAL CO LTD
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