Process for the preparation of cefditoren using the thioester of thiazolylacetic acid
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United States of America Patent
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Mar 30, 2004
Grant Date -
Dec 4, 2003
app pub date -
May 23, 2002
filing date -
May 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a process for the preparation of Cefditoren of the formula (I) ##STR1## which comprises acylating 7-amino-cephem carboxylic acids of the general formula (IV) ##STR2## where R.sub.3 is hydrogen or trimethylsilyl with thioester derivatives of the formula (II) ##STR3## wherein R.sub.1 represents C.sub.1 -C.sub.4 alkyl or phenyl in an organic solvent in the presence of an organic base at a temperature in the range of -10.degree. C. to 30.degree. C.
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