Method for preparing crystalline cefadroxil monohydrate

Details Method for preparing crystalline cefadroxil monohydrate Method for preparing crystalline cefadroxil monohydrate

C - Chemistry, Metallurgy

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260/104.5

C07D 501/22 (2006.01) A61K 31/545 (2006.01) C07B 63/00 (2006.01) C07D 501/00 (2006.01) C07D 501/02 (2006.01) C07D 501/04 (2006.01) C07D 501/12 (2006.01)

Patent

CA 1285554

A B S T R A C T "METHOD FOR PREPARING CRYSTALLINE CEFADROXIL MONOHYDRATE" The invention relates to a method for preparing crystalline cefadroxil monohydrate. According to such a method a cefadroxil solvate is slurried with isopropyl alcohol containing less 6% to 18% W/W of water at a temperature between + 45 and +55°C: the crystalline cefadroxil monohydrate is isolated by filtration. Some of the cefadroxil solvates which can be used are novel: they are prepared by adding dimethylacetamide, N-methyl-2-pyrroli- done or monomethylformamide to an aqueous solution of cefadroxil at a pH between 5.5 and 6.

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