Aziridinium ions are usefulreactive intermediates for the synthesis of enantiomerically enriched buildingblocks. However, N,N-dialkyl aziridinium ions are relatively underutilized in the synthesis of optically active molecules as compared to other three-membered ring cogeners, aziridines and epoxides. The characterization of both optically active aziridinium ions and secondary β-halo amines as the
Rearrangement of β-Chloro <i>N</i>-Oxides to Hydroxylamines: Opening of the Oxazetidinium Intermediate by Different Nucleophiles
作者:Ulrike K. Wefelscheid、Simon Woodward
DOI:10.1021/jo900031e
日期:2009.3.6
The rearrangement of β-chloro N-oxides to hydroxylamines is stereospecific in accord with the presence of a cyclic oxazetidinium intermediate. The latter opens with a range of nucleophiles (carboxylates, cyanide, azide, and thiols).