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
申请人:Caille Jean-Claude
公开号:US20070225516A1
公开(公告)日:2007-09-27
The invention provides the diastereoselective alkylation of optically active nopinone to form the compound of formula (I) according to scheme A below:
in which:
R is a C
5-15
alkyl group;
R1 is especially a C
1-15
alkyl, C
2-15
alkenyl or C
2-15
alkynyl group or a C
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.
The alkylation of (+)-nopinone oxime ether with various electrophiles afforded the corresponding adduct with a total stereoselectivity. Further reduction of the oxime ether afforded an easily access to new chiral γ-and δ-amino alcohols of high interest for catalysis and asymmetric synthesis.