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Cefaclor and synthetic method thereof

A technology of cefaclor and a synthesis method, applied in the field of cefaclor synthesis and biological synthesis of cefaclor, can solve the problems of complicated separation and purification methods of cefaclor, low purity of cefaclor, long reaction period and the like, and achieves shortening The effect of synthesis cycle, high product yield and simple circuit

Active Publication Date: 2014-04-30
HUNAN FLAG BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of cefaclor and its synthetic method, to solve the problem of many impurities, long reaction cycle, low purity of cefaclor and complex separation and purification method of cefaclor in the process of enzymatic synthesis of cefaclor in the prior art technical problem

Method used

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  • Cefaclor and synthetic method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] Take 30g (128mmol) of 7-ACCA, add 200ml of pure water and dissolve it with 6mol / L ammonia water, the pH after dissolving is 7.8~8.1, add 2000U penicillin acyltransferase, add D-phenylglycine methyl ester hydrochloride at a constant speed within 0~10 minutes Solution (solution preparation method 28.4g (141mmol) solid was added to 60ml pure water). Five minutes after the reaction started, before 0.2% (w / v) cefaclor was precipitated in the reaction solution, cefaclor seed crystals (purity greater than 90%) were added in one go. The synthetic pH is 6.4 and the temperature is 15°C.

[0049] After reacting for 120 minutes, sample HPLC detection, the 7-ACCA concentration at this time was 0.27mg / ml (see figure 1 ), 7-ACCA conversion rate 99.6%, sieve separation penicillin acylase and cefaclor suspension, cefaclor suspension weight after refining is 43.6g, and use 2-naphthol to reclaim cephalosporin from crystallization mother liquor Clo, obtain 2.9g of reclaimed cefaclor, and...

Embodiment 2

[0051] Take 30g (128mmol) 7-ACCA, add 200ml pure water, add 6mol / L ammonia water to dissolve, add 2000U penicillin acyltransferase, add D-phenylglycine methyl ester hydrochloride solution at a uniform speed within 0-10 minutes (solution preparation method 28.4g (141mmol) solid adds 60ml pure water), after reaction begins 15 minutes, before cefaclor does not separate out in the reaction solution, the cefaclor 2.9g crystal seed (purity is greater than 90%) that 2-naphthol reclaims among the example 1 is added disposablely ), synthesis pH6.4, temperature 15°C.

[0052] After 120 minutes of reaction, samples were taken for HPLC detection. At this time, the concentration of 7-ACCA was 0.38 mg / ml, and the conversion rate of 7-ACCA was 99.5%. The penicillin acylase and cefaclor suspension were separated by screen, and the cefaclor suspension was refined. After weight is 44.50g, cefaclor weight yield is 1.48.

Embodiment 3

[0054] Take 7-ACCA and D-phenylglycine methyl ester hydrochloride at a molar ratio of 1:1.05. Add pure water to 7-ACCA and dissolve it with 6mol / L ammonia water, add 12000U penicillin acyltransferase, add D-phenylglycine methyl ester hydrochloride aqueous solution at a constant speed within 0-30 minutes, and add 5% ( w / v) Cefaclor as seed crystal (purity greater than 50%), reaction pH 5.8, temperature 5°C.

[0055] Samples were taken at 60 minutes for HPLC detection. At this time, the concentration of 7-ACCA was 0.18 mg / ml, the conversion rate of 7-ACCA was 99.7%, and the total weight yield of cefaclor was 1.49.

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Abstract

The invention provides cefaclor and a synthetic method thereof. The synthetic method of cefaclor comprises that in the presence of an enzyme, cefaclor is generated by forming a reaction mixed solution of 7-ACCA and a D-phenylglycine methyl ester salt derivative and performing reaction, wherein cefaclor crystal seeds are added into the reaction mixed solution, and the crystal seeds are added before cefaclor generated in the reaction is precipitated. The method helps to improve the reaction efficiency, shorten the synthetic period, improve the conversion rate of 7-ACCA and improve the purity of obtained cefaclor.

Description

technical field [0001] The invention relates to the field of cefaclor synthesis, in particular to a method for biologically synthesizing cefaclor and cefaclor synthesized by the method. Background technique [0002] Cefaclor chemical name: the product is (6R,7R)-7-[(R)-2-amino-2-phenylacetamido)]-3-chloro-8-oxo-5-thia-1- Azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid monohydrate. Cefaclor is a second-generation oral cephalosporin. It has a strong killing effect on a variety of Gram-positive bacteria and Gram-negative bacteria. The antibacterial effect on non-enzyme-producing Staphylococcus aureus and pneumococcus is 2 to 4 times stronger than that of cefadroxil. Inhibits all Haemophilus influenzae, including ampicillin-resistant strains. [0003] At present, there are chemical and biological methods for the production of cefaclor at home and abroad. At present, the chemical method is mainly used to synthesize cefaclor in China, and only the Xinhua-Kenfu Company, a joint v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P35/04C07D501/59
Inventor 许岗曾红宇易杰
Owner HUNAN FLAG BIOTECHNOLOGY CO LTD
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