Intramolecular Epoxidation of Unsaturated Oxaziridines
作者:Alan Armstrong、Alistair G. Draffan
DOI:10.1055/s-1998-1733
日期:1998.6
Treatment of unsaturated oxaziridines with MeOTf results in intramolecular epoxidation, presumably via oxaziridinium salts. The method has been used to effect regioselective epoxidation of a non-conjugated diene.
Catalytic Asymmetric Mercuriocyclization of ?-Hydroxy-cis-Alkenes
作者:Sung Ho Kang、Mihyong Kim、Suk Youn Kang
DOI:10.1002/anie.200461289
日期:2004.11.19
Intramolecular epoxidation in unsaturated ketones and oxaziridines
作者:Alan Armstrong、Alistair G. Draffan
DOI:10.1039/b107839a
日期:2001.11.1
The possibility of intramolecular epoxidation in acyclic unsaturated ketones (via dioxiranes) and oxaziridines (via oxaziridinium species) has been investigated. Treatment of several acyclic unsaturated ketones with Oxone® led to low levels of regio- and stereocontrol, suggesting that background epoxidation by Oxone® dominates. However, treatment of unsaturated oxaziridines with methyl trifluoromethanesulfonate led to intramolecular epoxidation. This process allowed regioselective epoxidation of a non-conjugated diene. It also proceeded with a high degree of stereocontrol consistent with a stereoelectronic preference for a spiro-transition state.