[EN] IMPROVED SYNTHESIS OF OPTICALLY PURE (S) - 3-CYANO-5-METHYL-HEXANOIC ACID ALKYL ESTER, AN INTERMEDIATE OF (S)- PREGABALIN<br/>[FR] SYNTHÈSE AMÉLIORÉE D'UN ESTER ALKYLIQUE OPTIQUEMENT PUR DE L'ACIDE (S) - 3-CYANO-5-MÉTHYL-HEXANOÏQUE, INTERMÉDIAIRE DE LA (S)-PRÉGABALINE
申请人:LUPIN LTD
公开号:WO2011141923A3
公开(公告)日:2012-01-19
Enantio- and Diastereoselective Oxidation of <i>N</i>-Alkylimines Using Chiral <font>α</font>-Bromonitriles and Hydrogen Peroxide System
作者:Najeh Tka、Jamil Kraïem、Béchir Ben Hassine
DOI:10.1080/00397911.2011.573611
日期:2012.10.15
Chiral alpha-bromonitriles were prepared with good chemical and optical yields starting from natural alpha-amino acids by dehydrating the corresponding alpha-bromoamides with thionyl chloride. The combined system alpha-bromonitriles/hydrogen peroxide was examined for the enantio- and diastereoselective oxidation of N-alkylimines in basic media at room temperature. The oxidation of N-tertiobutylarylimines leads to optically active oxaziridines with moderate enantiomeric excess. However, the oxidation of (S)-1-phenylethylarylimines affords the corresponding oxaziridines with good diasteromeric excess up to 97/3 as proved by gaseous-phase chromatography.
Umwandlung von Aldehyden in 2-monosubstituierte Aziridine. Reduktion von α-Chlor, Brom- und Sulfonyloxynitilen mit Lithiumaluminiumhydrid
作者:Kunihiro Ichimura、Masaki Ohta
DOI:10.1246/bcsj.43.1443
日期:1970.5
The reductive cyclization of α-chloro, bromo- and sulfonyloxycarbonitriles are described. α-Chlorocarbonitriles were reduced by lithium aluminum hydride to afford aziridines in sufficient yields. The Walden inversion was found to take place in the cource of the reductive cyclization of S-α-chloroisocapronitrile. We have found the two-step conversion of aldehydes to 2-mono-substituted aziridines which
Synthesis of Enantiomerically Enriched <font>α</font>-Bromonitriles from Amino Acids
作者:Najeh Tka、Jamil Kraïem、Béchir Ben Hassine
DOI:10.1080/00397911.2011.608142
日期:2013.1.1
Two methods were investigated for the preparation of six chiral alpha-bromonitriles with different optic purities. The nitrous deamination of amino acids gives alpha-bromoacids, which react with chlorosulfonyl isocyanate followed by triethylamine to afford alpha-bromonitriles with moderate enantiomeric excess. However, the dehydration of corresponding alpha-bromoamids using thionyl chloride gives alpha-bromonitriles with good enantiomeric excess up to 94%. The use of phosphoryl chloride instead of thionyl chloride results in more than 30% racemization as determined by high-performance liquid chromatograpic analysis.