Hydrogenation of ketones having at least a carbon-carbon double bond in the gamma-,delta-position
申请人:DSM IP Assets B.V.
公开号:EP2535323A1
公开(公告)日:2012-12-19
The present invention relates in a first aspect to a process for hydrogenation of ketones having at least a carbon-carbon double bond in the γ, δ-position to the keto group by hydrogen in the presence of at least one chiral iridium complex having a specific structure and particularly a specific aromatic ligand. It has been shown that this process leads to a strong increase in preferential formation of a single isomer. The process is particularly suitable for the hydrogenation of γ, δ -unsaturated ketones which can be used as flavours and fragrances or for the preparation of vitamin E and its derivatives or of flavours and fragrances.
[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.
[EN] FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF PHENOLS OR THIOPHENOLS<br/>[FR] FORMATION DE 4-CHROMANONES CHIRALES UTILISANT DES PYRROLIDINES CHIRALES EN LA PRÉSENCE DE PHÉNOLS OU DE THIOPHÉNOLS
申请人:DSM IP ASSETS BV
公开号:WO2015001029A1
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 formula of a specific type and of at least one phenol or thiophenol.
[EN] FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF UREAS OR THIOUREAS<br/>[FR] FORMATION DE 4-CHROMANONES CHIRALES AU MOYEN DE PYRROLIDINES CHIRALES EN PRÉSENCE D'URÉES OU DE THIOURÉES
申请人:DSM IP ASSETS BV
公开号:WO2015001030A1
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 formula of a specific type and of at least one urea or thiourea.
[EN] FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES<br/>[FR] FORMATION DE 4-CHROMANONES CHIRALES AU MOYEN DE PYRROLIDINES CHIRALES
申请人:DSM IP ASSETS BV
公开号:WO2015001031A1
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 formula of a specific.