Isomerisation process
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United States of America Patent
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Feb 15, 2000
Issued Date -
N/A
app pub date -
Mar 27, 1998
filing date -
Aug 5, 1995
priority date (Note) -
Expired
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Abstract
A process for the preparation of a compound (I) ##STR1## wherein R is a hydroxyl protecting group which comprises isomerising a compound of formula (I) wherein R is a hydroxyl protecting group by reacting the compound of formula (I) with a sterically hindered organic base in the presence of a Lewis acid and a compound of forumula (III) ##STR2## wherein R.sub.1 and R.sub.2 each independently represent cyano, COR.sub.5 or COR.sub.2 R.sub.6 or R.sub.1 and R.sub.2 together with the carbon atom to which they are attached from a C.dbd.O group; R.sub.5 represents alkyl, cycloalkyl, amino, alkylamino, dialkyl amino or optionally substituted phenyl or phenylalkyl group; R.sub.6 represents alkyl, cycloalkyl or optionally substituted phenyl or phenylalkyl group; R.sub.3 and R.sub.4 represent each independently hydrogen, alkyl, alkoxy or optionally substituted phenyl group.
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