Process for the diastereoselective alkylation of an ether oxime of the compound nopinone and novel intermediates for the synthesis of diastereospecific 2-amino-nopinone derivatives substituted on carbon 3
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United States of America Patent
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Jun 24, 2008
Grant Date -
Sep 27, 2007
app pub date -
Jul 12, 2006
filing date -
Mar 27, 2006
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Abstract
The invention provides the diastereoselective alkylation of optically active nopinone to form the compound of formula (I) according to scheme A below: ##STR00001## in which: --R is a C.sub.5-15 alkyl group; --R1 is especially a C.sub.1-15 alkyl, C.sub.2-15 alkenyl or C.sub.2-15 alkynyl group or a C.sub.5-15 aryl, each group optionally being substituted; and --X is a halogen atom; and the configuration of the compound of formula (I) is either (E) or (Z) or a mixture of the two.The compound of formula (I) is a valuable synthetic intermediate.
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