Synthesis and Reactions of exo-Camphorylsulfonyloxaziridine
摘要:
The first example of an exo-camphorylsulfonyloxaziridine 4a was prepared by m-CPBA oxidation of camphor imine 9. This surprising result is due to the conformation of the imine which apparently prevents attack of the peracid from the endo direction. Similar oxidations of all other camphorsulfonylimines result in the endo-oxaziridine exclusively. Asymmetric oxidation of sulfides to sulfoxides and the alpha-hydroxylation of enolates by 4 can be interpreted in terms of open transition states where nonbonded interactions are minimized. These results support earlier conclusions and predictions of the stereoselectivity and mechanisms of molecular recognition by the N-sulfonyloxaziridine class of oxidizing reagents.
Synthesis and Reactions of <i>exo</i>-Camphorylsulfonyloxaziridine
作者:Franklin A. Davis、Rajarathnam E. Reddy、Parimala V. N. Kasu、Padma S. Portonovo、Patrick J. Carroll
DOI:10.1021/jo961991v
日期:1997.5.1
The first example of an exo-camphorylsulfonyloxaziridine 4a was prepared by m-CPBA oxidation of camphor imine 9. This surprising result is due to the conformation of the imine which apparently prevents attack of the peracid from the endo direction. Similar oxidations of all other camphorsulfonylimines result in the endo-oxaziridine exclusively. Asymmetric oxidation of sulfides to sulfoxides and the alpha-hydroxylation of enolates by 4 can be interpreted in terms of open transition states where nonbonded interactions are minimized. These results support earlier conclusions and predictions of the stereoselectivity and mechanisms of molecular recognition by the N-sulfonyloxaziridine class of oxidizing reagents.