Preparation method for cefotetan disodium
A technology of cefotetan disodium and cefotetan acid, which is applied in the field of medicine, can solve the problems of dark product color, solvent residual substance content, and poor clarity, and achieve low content, low polymer and related substance content, and low raw material easy effect
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[0055] The invention provides a preparation method of cefotetan disodium, and those skilled in the art can learn from the content of this article and appropriately improve the process parameters to realize it. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.
[0056] The invention provides a preparation method of cefotetan disodium. First, take cefotetan acid and mix it with silica gel after the first salt formation, collect the first filtrate through th...
Embodiment 1
[0080] The preparation of embodiment 1 cefotetan acid
[0081] 30.00kg of 7β-amino-7α-methoxy-3-[(1-methyl-1H-tetrazol-5-yl)thiomethyl]-3-cephem-4-carboxylic acid diphenylmethyl ester Add (7-MAC) into a 500L enamel reaction kettle with 180L dichloromethane, stir for 30 minutes to dissolve it, cool down to -20°C, add 10.5kg N,N-dimethylaniline and 16.5kg bromoacetyl bromide, After reacting for 1 hour, the reaction liquid was washed successively with 30L ice water, 30L saturated potassium bisulfate solution, and 30L saturated sodium bicarbonate solution (stirring for 30 minutes during each washing, and resting for 30 minutes), layered, and the dichloromethane layer was washed with 2 kg of Dry over sodium sulfate for 60 minutes, dry the filtrate under reduced pressure at 40°C, and recover the solvent to obtain 25.2 kg of residual oil, which is 7β-bromoacetamido-7α-methoxy-3-(1-methyl-1H -5-tetrazolyl)thiomethyl-3-cephem-4-carboxylic acid benzhydryl ester;
[0082] Get 25kg of 7...
Embodiment 2
[0084] The preparation of embodiment 2 cefotetan acid
[0085] 30.00kg of 7β-amino-7α-methoxy-3-[(1-methyl-1H-tetrazol-5-yl)thiomethyl]-3-cephem-4-carboxylic acid diphenylmethyl ester Add (7-MAC) into a 500L enamel reaction kettle with 300L dichloromethane, stir for 60 minutes to dissolve it, cool down to -30°C, add 13.5kg N,N-dimethylaniline and 21.0kg bromoacetyl bromide, After reacting for 1 hour, the reaction solution was washed successively with 60L ice water, 60L saturated potassium bisulfate solution, and 60L saturated sodium bicarbonate solution (stirring for 30 minutes during each washing, and resting for 30 minutes), layered, and the dichloromethane layer was washed with 4 kg of Dry over sodium sulfate for 60 minutes, dry the filtrate under reduced pressure at 40°C, and recover the solvent to obtain 25.4 kg of residual oil, which is 7β-bromoacetamido-7α-methoxy-3-(1-methyl-1H -5-tetrazolyl)thiomethyl-3-cephem-4-carboxylic acid benzhydryl ester;
[0086] Get 25kg of...
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