Preparation of cefalosporins intermediates and conversion of said intermediates into active compound precursors
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
May 27, 2003
filing date -
May 27, 2003
priority date (Note) -
Abandoned
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Abstract
There is described the preparation of the new 7.beta.-[(2-aminothiazol-4-y-l)glyoxylamido-3-hydroxymethyl-2-cephem-4-carboxylic acid derivatives, in which the amino group is free or protected by a removable group, and the subsequent conversion of the compounds thus obtained into active cephalosporin precursors either by esterification of the hydroxy group or replacement of the hydroxy group by a halogen atom and, in the latter case, by subsequent replacement of the halogen atom of said 7.beta.-[(2-aminothiazol-4-yl)glyoxylamido-3-halomethyl-3-cephem-4-carbox-ylic acid derivatives by the residue of a nucleophilic compound to obtain corresponding, immediate precursors of 7.beta.-[.alpha.-(2-aminothiazol-4--yl-.alpha.-methoxyimino]acetamido-3-(substituted)methyl-3-cephem-4-carbox-ylic acid derivatives.
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