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.
本发明涉及一种制备具有β或γ位置上的光学活性羟基的
炔烃的方法及其中间体的制备。用于制备具有β位置上的光学活性羟基的
炔烃的本发明方法的特征在于它包括在Lewis酸存在下的反应:化合物的化合物(IV):其中:R是具有1至6个碳原子的直链或支链烷基基团。和化合物的化合物(V):R′—C≡C-M (V)其中:R′代表氢原子,具有1至8个碳原子的直链或支链烷基基团,优选为甲基基团或三烷基
硅基团。M代表
金属,优选为周期表的(Ia)族
金属,优选为
锂。本发明的另一个对象包括通过对先前获得的具有β位置上的光学活性羟基的
炔烃进行异构化来生产具有γ位置上的光学活性羟基的
炔烃。