Crystalline antibiotic intermediate

Details Crystalline antibiotic intermediate Crystalline antibiotic intermediate

C - Chemistry, Metallurgy

07

D

260/271

C07D 471/04 (2006.01) C07D 463/00 (2006.01)

Patent

CA 1334590

Crystalline p-nitrobenzyl 7.beta.-phenoxyacetyl- amino-3-hydroxy-1-carba(dethia)-3-cephem-4-carboxylate and the crystalline mono-acetic acid solvate thereof are provided by mixing a carboxylic acid or a sulfonic acid with a solution of the 3-hydroxy ester in DMF or DMAC. Acetic acid provides the crystalline acetic acid solvate while other acids provide crystalline non- solvated 3-hydroxy ester. The crystalline forms are useful purified intermediates to antibiotics.

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