[EN] PROCESS OF SEPARATING CHIRAL ISOMERS OF CHROMAN COMPOUNDS AND THEIR DERIVATIVES AND PRECURSORS<br/>[FR] PROCÉDÉ DE SÉPARATION DES ISOMÈRES CHIRAUX DES COMPOSÉS DE CHROMANE, DE LEURS DÉRIVÉS ET PRÉCURSEURS
申请人:DSM IP ASSETS BV
公开号:WO2012152779A1
公开(公告)日:2012-11-15
The present invention relates to a process of separating chiral isomers of chroman compounds, particularly tocopherols and tocotrienols as well as the esters and intermediates thereof. It has been found that this process allows a separation of the desired isomer with a higher yield and enables the use of the non-desired isomers in a very efficient way. Said process is particularly useful when implemented in an industrial process. Furthermore, it has been found that this process allows using isomer mixtures as they result from traditional industrial synthesis.
[EN] FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF ACIDS<br/>[FR] FORMATION DE 4-CHROMANONES CHIRALES À PARTIR DE PYRROLIDINES CHIRALES, EN PRÉSENCE D'ACIDES
申请人:DSM IP ASSETS BV
公开号:WO2015001027A1
公开(公告)日:2015-01-08
The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.
Chroman-4-ones are prepared by reacting an o-hydroxyarylcarbonyl compound with a carbonyl compound in the presence of an amine. A typical reaction of o-hydroxy-acetophenone with cyclopentanone can be depicted as follows: ##STR1##
[EN] NOVEL SYNTHESIS OF INTERMEDIATES FOR THE PREPARATION OF ALPHA-TOCOPHEROL<br/>[FR] NOUVELLE SYNTHÈSE D'INTERMÉDIAIRES DESTINÉS À LA PRÉPARATION D'ALPHA-TOCOPHÉROL
申请人:DSM IP ASSETS BV
公开号:WO2019012000A1
公开(公告)日:2019-01-17
The present invention relates to a novel synthetic pathway for alpha- tocopherol. The invention discloses different reactions yielding some new intermediates in a very high yield and stereoselectivity.