Catalysis of Cope-type rearrangements of bis-homoallylic hydroxylamines is demonstrated using chiral thiourea derivatives. This formal intramolecular hydroamination reaction provides access to highly enantioenriched alpha-substituted pyrrolidine products and represents a complementary approach to metal-catalyzed methods.
The regiochemistry of intramolecular n-alkenylnitrone additions: preparative and mechanistic implications
作者:Wolfgang Oppolzer、Samuel Siles、Roger L. Snowden、Bartholomeus H. Bakker、Martin Petrzilka
DOI:10.1016/s0040-4039(01)86596-5
日期:——
The opposite regiochemistry, observed for the reactions 7a → 8a and 7d → 8d, as compared with additions 7b → 9b, 7c → 9c and 7e → 9e, supports the hypothesis that in the transition state of nitrone-olefin additions the new C,C bond is more advanced than the C,0, bond. Further examples show the superimposition of substituent effects on this intramolecular control.
作者:Adam R. Brown、Christopher Uyeda、Carolyn A. Brotherton、Eric N. Jacobsen
DOI:10.1021/ja402893z
日期:2013.5.8
Catalysis of Cope-type rearrangements of bis-homoallylic hydroxylamines is demonstrated using chiral thiourea derivatives. This formal intramolecular hydroamination reaction provides access to highly enantioenriched alpha-substituted pyrrolidine products and represents a complementary approach to metal-catalyzed methods.