Method of preparation of an alkyne with an optically active hydroxyl group in the beta or gamma position of a triple bond and intermediates obtained
申请人:Garel Laurent
公开号:US20070004942A1
公开(公告)日:2007-01-04
The present invention relates to a method of preparation of an alkyne with an optically active hydroxyl group in the β or γ position of a triple bond and intermediates obtained. The method of the invention for preparation of an alkyne with an optically active hydroxyl group in the β position of a triple bond is characterized in that it comprises the reaction, in the presence of a Lewis acid:
of a compound of formula (IV):
in which: R is a linear or branched alkyl group having from 1 to 6 carbon atoms. and of a compound of formula (V):
R′—C≡C-M (V)
in which: R′ represents a hydrogen atom, a linear or branched alkyl group having from 1 to 8 carbon atoms, preferably a methyl group or a trialkylsilyl group. M represents a metal, preferably a metal of group (Ia) of the periodic table, preferably lithium. Another object of the invention comprises the production of an alkyne with an optically active hydroxyl group in the γ position of a triple bond by isomerization of an alkyne with an optically active hydroxyl group in the β position previously obtained.