Enantioselective Silver and Amine Co-catalyzed Desymmetrizing Cycloisomerization of Alkyne-Linked Cyclohexanones
作者:Rubén Manzano、Swarup Datta、Robert S. Paton、Darren J. Dixon
DOI:10.1002/anie.201612048
日期:2017.5.15
A silver(I) and amine co‐catalyzed desymmetrization of 4‐propargylamino cyclohexanones for the direct enantioselective synthesis of 2‐azabicyclo[3.3.1]nonanes is described. Exploiting reactivity arising from dual activation of the pendant terminal alkyne by silver(I) and the ketone moiety through transient enamine formation, this synthetically relevant transformation is easy to perform, efficient and
Fluorinated Chiral Secondary Amines as Catalysts for Epoxidation of Olefins with Oxone
作者:Chun-Yu Ho、Ying-Chun Chen、Man-Kin Wong、Dan Yang
DOI:10.1021/jo048378t
日期:2005.2.1
amines having different substitution patterns and have screened them as catalysts for the asymmetricepoxidation of olefins using Oxone. The highest enantiomeric excess (61%) occurred for the epoxidation of 1-phenylcyclohexene catalyzed by a secondary amine bearing a fluorine atom at the β-position relative to the amino center. Our experimental results provide further support to the notion that the amine