Corey−Chaykovsky Epoxidation of Twisted Amides: Synthesis and Reactivity of Bridged Spiro-epoxyamines
作者:Michal Szostak、Jeffrey Aubé
DOI:10.1021/ja906471q
日期:2009.9.23
The first example of a Corey-Chaykovsky epoxidation employing amides as substrates is described. Medium-bridged twisted amides serve as precursors to a family of isolable aminoepoxides. The reactivity of bridged spiro-epoxyamines is also investigated.
Cation−n Control of Regiochemistry of Intramolecular Schmidt Reactions en Route to Bridged Bicyclic Lactams
作者:Michal Szostak、Lei Yao、Jeffrey Aubé
DOI:10.1021/ol901771b
日期:2009.10.1
The regiochemistry of the intramolecular Schmidt reaction of 2-azidoalkylketones is controlled by placing a thioether substituent at the position adjacent to the ketone to provide access to a family of unsubstituted medium bridged twisted amides. This outcome is ascribed to the presence of stabilizing through-space interactions between the diazonium cation and the n electrons on heteroatom and does
Stability of Medium-Bridged Twisted Amides in Aqueous Solutions
作者:Michal Szostak、Lei Yao、Jeffrey Aubé
DOI:10.1021/jo802192v
日期:2009.3.6
are typically hypersensitive to hydrolysis, a feature that has stringently limited their utility in water. We have synthesized a series of bridged lactams that contain a twisted amide linkage but exhibit enhanced stability in aqueous environments. Many of these compounds were extracted unchanged from aqueous mixtures ranging from the strongly basic to the strongly acidic. NMR experiments showed that tricyclic