The treatment of 1,1,1,3-tetrachloro-3-phenylpropane with alkali in ethanol affords ethynyl phenyl ketone and its acetal in good yields. This reaction proceeds through the elimination of hydrogenchloride and an efficient 1,3-proton transfer catalyzed by base. Ethyl cinnamate is obtained in only 2% yield.
[EN] METHOD FOR THE PREPARATION OF TAPENTADOL AND ITS INTERMEDIATES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE TAPENTADOL ET DE SES INTERMÉDIAIRES
申请人:SANECA PHARMACEUTICALS A S
公开号:WO2019035775A1
公开(公告)日:2019-02-21
A method for the preparation of tapentadol in the form of a base or its hydrogen chloride, which involves the preparation of a salt (III) from a mixture of diastereomers (II) by means of crystallization-induced asymmetric transformation (CIAT) through oxo-enol tautomeric equilibrium of covalently linked diastereomers, shifted towards the desired diastereomer without the use of chiral resolution with chiral carboxyl acids.