PROCESS FOR PREPARING ENANTIOMERICALLY ENRICHED BETA-AMINO ACID DERIVATIVES
申请人:Berkessel Albrecht
公开号:US20090187017A1
公开(公告)日:2009-07-23
The present invention relates to a process for the organo-catalysed kinetic racemate resolution of compounds of the general formula (II). It is thus possible through the action of catalytic amounts of enantiomerically enriched compounds of the general formula (Ia) or (Ib) to obtain on the one hand enantiomerically enriched optionally N-acylated β-amino acid esters and on the other hand enantiomerically enriched 4,5-dihydrooxazin-6-ones (oxazinones). The corresponding enantiomerically enriched β-amino acids can be formed from both easily separable classes of compounds by simple hydrolysis.
[EN] PROCESS FOR PREPARING ENANTIOMERICALLY ENRICHED BETA-AMINO ACID DERIVATIVES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE BÊTA-AMINOACIDES ÉNANTIOMÉRIQUEMENT ENRICHIS
申请人:DEGUSSA
公开号:WO2007023056A1
公开(公告)日:2007-03-01
[EN] The present invention relates to a process for the organo- catalysed kinetic racemate resolution of compounds of the general formula (II). It is thus possible through the action of catalytic amounts of enantiomerically enriched compounds of the general formula (Ia) or (Ib) to obtain on the one hand enantiomerically enriched optionally N-acylated ß-amino acid esters and on the other hand enantiomerically enriched 4, 5-dihydrooxazin-6-ones (oxazinones). The corresponding enantiomerically enriched ß-amino acids can be formed from both easily separable classes of compounds by simple hydrolysis. [FR] La présente invention concerne un procédé de dédoublement cinétique organo-catalysé de racémates de composés de formule générale (II). Il est ainsi possible, par l'action de quantités catalytiques de composés énantiomériquement enrichis de formule générale (Ia) ou (Ib), d'obtenir d'une part des esters de ß-aminoacides énantiomériquement enrichis et éventuellement N-acylés, et d'autre part des 4,5-dihydrooxazin-6-ones (oxazinones) énantiomériquement enrichies. Les ß-aminoacides énantiomériquement enrichis correspondants peuvent être obtenus à partir de ces deux classes de composés aisément séparables par simple hydrolyse.
Structural optimization of thiourea-based bifunctional organocatalysts for the highly enantioselective dynamic kinetic resolution of azlactones
作者:Albrecht Berkessel、Santanu Mukherjee、Thomas N. Müller、Felix Cleemann、Katrin Roland、Marc Brandenburg、Jörg-M. Neudörfl、Johann Lex
DOI:10.1039/b607574f
日期:——
describes the synthesis of a library of structurally diverse bifunctionalorganocatalysts bearing both a quasi-Lewis acidic (thio)urea moiety and a Bronsted basic tertiary amine group. Sequential modification of the modular catalyst structure and subsequent screening of the compounds in the alcoholytic dynamickineticresolution (DKR) of azlactones revealed valuable structure-activity relationships. In particular