Preparation of taxanes from 9-dihydro-13-acetylbaccation III
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United States of America Patent
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Apr 15, 2014
Grant Date -
Jun 16, 2011
app pub date -
Feb 21, 2011
filing date -
Mar 31, 2005
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Abstract
A new process for preparing a compound of Formula V, wherein P is a hydroxy protecting group and R is acetyl, said process including the steps of: i) selectively deacetylating the 10-hydroxy group of 9-dihydro-13-acetylbaccatin III with N,N-dimethylethylenediamine to produce 9-dihydro-10-deacetyl-13-acetyl-baccatin III; ii) concomitantly protecting 7-hydroxy and 10-hydroxy groups of the reaction product of step i); and iii) oxidizing the 9-hydroxy group of the reaction product of step ii) with an oxidizing agent to produce the compound of formula V.
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