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A cefotetan acid preparation method

A technology of cefotetan acid and cefotetan, which is applied in the field of preparation of cefotetan acid, can solve the problems of low weight yield and achieve the effects of high product purity, good color and good application prospect

Active Publication Date: 2018-11-09
FUJIAN FUKANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above weight yield of cefotetan acid prepared by 7-MCTT has only 70~80%, there is the shortcoming that weight yield is low

Method used

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  • A cefotetan acid preparation method

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preparation example Construction

[0025] A preparation method of cefotetan acid, comprising the following steps:

[0026] 1) Add water into the reaction tank, cool down to 0-6°C, start stirring, then add 7-MCTT (structural formula 12), sodium bicarbonate, cefotetan side chain (trisodium isothiazole), stir to dissolve;

[0027] 2) Control the temperature of the reaction liquid in the reaction tank to be 0-6°C, and react for 88-90 hours at a pH value of 7.5-8.0, wherein, when the reaction time reaches 48-56 hours, add the previous batch of secondary crystallized cephalosporins Titan salt dry powder;

[0028] 3) After the reaction, transfer the reaction solution to the extraction tank, adjust the pH value of the reaction solution to 4.0-5.0 with hydrochloric acid, add medicinal charcoal to the extraction tank, stir the carbon for 30-40 minutes, then filter and collect the filtrate;

[0029] 4) Add butanone to the filtrate, adjust the pH value of the feed solution to 1.5-2.0 with hydrochloric acid, stir for 15-25...

Embodiment 1

[0036] A preparation method of cefotetan acid:

[0037] 1) Add 250ml of water to the reaction tank, cool down to 3°C, start stirring, add 30g of 7-MCTT, 12g of sodium bicarbonate, 18.5g of cefotetan side chain, and stir to dissolve;

[0038] 2) Control the temperature of the reaction liquid in the tank to 3°C, and react at a pH value of 7.8 for 88 hours (after 52 hours of reaction time, add 4.5 g of the dry powder of cefotetan salt from the previous batch of secondary crystallization);

[0039] 3) After the reaction is finished, transfer the reaction solution to an extraction tank, and adjust the pH value of the reaction solution to 4.5 with hydrochloric acid. After the pH adjustment is completed, add 0.3 g of medicinal charcoal to the tank, stir for 35 minutes to remove the charcoal, and then filter;

[0040] 4) After the filtration, add 600 ml of methyl ethyl ketone to the filtrate, adjust the pH of the feed liquid to 1.8 with hydrochloric acid, stir for 20 minutes, then let...

Embodiment 2

[0046] A preparation method of cefotetan acid:

[0047] 1) Add 250ml of water into the reaction tank, cool down to 0°C, start stirring, add 30g of 7-MCTT, 12g of sodium bicarbonate, 18.5g of cefotetan side chain, and stir to dissolve;

[0048] 2) Control the temperature of the reaction solution in the tank to 0°C, and react at a pH value of 7.5 for 90 hours (after 48 hours of reaction time, add 5.5 g of the dry powder of cefotetan salt of the previous batch of secondary crystallization);

[0049] 3) After the reaction is finished, transfer the reaction solution to an extraction tank, and adjust the pH value of the reaction solution to 4.0 with hydrochloric acid. After the pH adjustment is completed, add 0.3 g of medicinal charcoal to the tank, stir for 30 minutes to remove the charcoal, and then filter;

[0050]4) After the filtration, add 600ml of methyl ethyl ketone to the filtrate, adjust the pH of the feed solution to 1.5 with hydrochloric acid, stir for 15 minutes, then l...

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Abstract

A cefotetan acid preparation method is disclosed. A filtrate after filtration of cefotetan acid crystals is subjected to secondary crystallization, and the cefotetan salt obtained by the secondary crystallization is added into a reaction solution when the cyclization reaction time between 7-MCTT and a cefotetan side chain compound is 48-56 h so that the weight yield of cefotetan acid prepared fromthe 7-MCTT is increased to 90% or above and a product is high in purity and good in color. The method is suitable for industrial production and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of fine organic synthesis, and in particular relates to a preparation method of cefotetan acid. Background technique [0002] Cefotetan disodium plays a bactericidal effect by inhibiting cell wall synthesis, and has broad-spectrum antibacterial activity against Gram-positive aerobic, anaerobic and Gram-negative aerobic bacteria. The methoxy group at the 7-α position makes cefotetan highly stable to β-lactamases, including penicillinases and cephalosporinases belonging to Gram-negative bacteria. Cefotetan disodium is converted into disodium salt by the reaction of cefotetan acid and sodium bicarbonate. Cefotetan acid is obtained by three-step structural modification of cefetetan intermediate 7-AMCA. The chemical reaction formula is as follows: [0003] [0004] Among them, (1) 7-AMCA, (10) chloroacetyl chloride, (11) 7-CMAC, (12) 7-MCTT, (5) cefotetan acid side chain, (14) cefotetan acid. [0005] The weight yield...

Claims

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Application Information

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IPC IPC(8): C07D501/57C07D501/04
CPCC07D501/04C07D501/57
Inventor 蔡福武
Owner FUJIAN FUKANG PHARMA
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