[EN] PROCESS FOR PREPARING HYDROCINNAMIC ALDEHYDES IN ENANTIOPURE OR ENANTIOMERICALLY ENRICHED FORM [FR] PROCÉDÉ DE PRÉPARATION D'ALDÉHYDES HYDROCINNAMIQUES DE FORME ÉNANTIOPURE OU ÉNANTIOMÉRIQUEMENT ENRICHIE
[EN] PROCESS FOR PREPARING HYDROCINNAMIC ALDEHYDES IN ENANTIOPURE OR ENANTIOMERICALLY ENRICHED FORM [FR] PROCÉDÉ DE PRÉPARATION D'ALDÉHYDES HYDROCINNAMIQUES DE FORME ÉNANTIOPURE OU ÉNANTIOMÉRIQUEMENT ENRICHIE
[EN] PROCESS FOR PREPARING HYDROCINNAMIC ALDEHYDES IN ENANTIOPURE OR ENANTIOMERICALLY ENRICHED FORM<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ALDÉHYDES HYDROCINNAMIQUES DE FORME ÉNANTIOPURE OU ÉNANTIOMÉRIQUEMENT ENRICHIE
申请人:ENDURA SPA
公开号:WO2010131274A1
公开(公告)日:2010-11-18
A process is described for preparing hydrocinnamic aldehydes in enantiopure or enantiomerically enriched form of Formula I, in which R is isopropyl or tert-butyl and R' is hydrogen, or R and R' when taken together are a methylenedioxolyl group, comprising the following steps: a) reacting the hydrocinnamic aldehyde of Formula I with the alcohol of Formula Il in enantiopure or enantiomerically enriched form to give the crystallized hemiacetal of Formula III, in which R, R' have the same meaning as Formula I and (*) indicates a stereogenic centre in the absence of a solvent or in one or more aprotic solvents or mixtures thereof with apolar solvents; b) recovering the hydrocinnamic aldehyde of Formula I in enantiopure or enantiomerically enriched form from the crystallized hemiacetal of Formula III and the aldehyde of opposite configuration in enantiopure or enantiomerically enriched form from the hemiacetal crystallization mother liquors. The invention also concerns a process for preparing the alcohol of Formula Il to be introduced into step a).