A kind of preparation method of ceftaroline axetil
A technology of ceftaroline axetil and cephem, which is applied in the field of preparation of ceftaroline axetil, can solve the problems of unfavorable industrial production, unavailable raw materials, and many by-products, and achieve the effects of low cost, improved purity, and few side reactions
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Embodiment 1
[0037] 1) Preparation of 7β-[(phenylacetyl)amino]-3-[4-pyridyl-2-thiazolylthio]-3-cephem-4-carboxylic acid benzhydryl ester (Formula Ic)
[0038] At 20-25°C, add 2000mL dehydrated dimethylformamide into a dry reaction vessel, add 80g thionyl chloride at room temperature, control the temperature at 30°C, stir for 1 hour, then add 222g 7-phenylacetyl Amino-3-hydroxy-3-cephalosporin-4-carboxylic acid benzhydryl ester (formula Ia, 0.4mol, technical grade, content ≥ 90%), control the temperature at 25°C, stir for 8 hours, add 15 liters of ice water , the separated solid is filtered, rinsed with a small amount of clear water, and suction filtered to obtain about 228g of 7-phenylacetamido-3-chloro-3-cephalosporin-4-carboxylic acid diphenylmethyl ester filter cake (formula Ib, measure moisture is 15.8%, the equivalent dry weight is 192g, 0.36mol), and the molar yield is 90%.
[0039] Suspend 221.5g of 7-phenylacetamido-3-chloro-3-cephalosporin-4-carboxylic acid benzhydryl ester filte...
Embodiment 2
[0050] 1) Preparation of 7β-[(phenylacetyl)amino]-3-[4-pyridyl-2-thiazolylthio]-3-cephem-4-carboxylic acid benzhydryl ester (Formula Ic)
[0051] At a temperature of 20-25°C, add 2800mL of dehydrated dimethylformamide into a dry reaction vessel, add 120g of thionyl chloride at room temperature, control the temperature at 30°C, stir for 1 hour, and then add 278g of 7-phenylacetyl Amino-3-hydroxy-3-cephalosporin-4-carboxylic acid benzhydryl ester (Formula Ia, 0.5mol, technical grade, content ≥ 90%), control the temperature at 25°C, stir for 8 hours, add 15 liters of ice water , the separated solid is filtered, rinsed with a small amount of clear water, and suction filtered to obtain about 295g of 7-phenylacetamido-3-chloro-3-cephalosporin-4-carboxylic acid diphenylmethyl ester filter cake (formula Ib, measure moisture is 18.0%, the equivalent dry weight is 242g, 0.455mol, and the molar yield is 91%).
[0052] The above-mentioned 7-phenylacetamido-3-chloro-3-cephalosporin-4-carb...
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