Process for preparing 4-alkyl- or 4-aryl-oxycarbonyl paclitaxel analogs and novel intermediates
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United States of America Patent
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Apr 18, 2006
Grant Date -
Mar 10, 2005
app pub date -
Aug 2, 2004
filing date -
Aug 7, 2003
priority date (Note) -
Expired
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Abstract
A process is provided for preparing 4-alkyl- or 4-aryl-oxycarbonyl paclitaxel analogs which includes the steps of converting paclitaxel into a C-7 acylprotected paclitaxel employing an electrophilic protecting group, such as benzoyloxycarbonyl, and converting the C-7 protected analog into the 4-alkyloxycarbonyl or 4-aryloxycarbonyl paclitaxel analog. Novel intermediates produced in the process are also provided.
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