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.