Process for the preparation of...

C - Chemistry – Metallurgy – 07 – D

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C07D 453/02 (2006.01)

Patent

CA 2500635

A process for preparing (S,S)-cis-2-benzhydryl-3-benzylaminoquinuclidine. The process includes the steps of contacting a compound containing a mixture of R- and S-isomers and having Formula (I), with an effective amount of a chiral organic acid in the presence of an organic solvent and an effective amount of an organic carboxylic acid for converting the R-isomer into an acid salt of the S isomer, wherein the organic solvent is capable of solubilizing the compound containing the mixture of R- and S-isomers, while precipitating the acid salt and the organic carboxylic acid is different from the chiral organic acid; neutralizing the acid salt with a base to provide an S-isomer of a chiral ketone of Formula (II), and reacting the chiral ketone with an organic amine in the presence of a Lewis acid to provide the corresponding imine and reducing the imine.

L'invention porte sur un procédé de préparation de (S,S)-cis-2-benzhydryl-3-benzylaminoquinuclidine. Ce procédé consiste à mettre en contact un composé, contenant un mélange des isomères R et S et de formule (I), avec une quantité efficace d'un acide organique chiral en présence d'un solvant organique et une quantité efficace d'un acide carboxylique organique afin de convertir l'isomère R en un sel acide de l'isomère S. Le solvant organique est capable de solubiliser le composé comprenant le mélange des isomères R et S et de précipiter le sel acide, l'acide carboxylique organique étant différent de l'acide organique chiral; neutraliser le sel acide avec une base pour produire un isomère S d'une cétone chirale de formule (II) et mettre à réagir la cétone chirale avec une amine organique en présence d'un acide Lewis pour produire l'imine correspondant et réduire l'imine.

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