Regio- and Diastereoselective Copper(I)-Catalyzed Allylic Substitution of δ-Hydroxy Allylic Chlorides by a Silicon Nucleophile
作者:Chinmoy K. Hazra、Elisabeth Irran、Martin Oestreich
DOI:10.1002/ejoc.201300493
日期:2013.8
A perfectly γ-selectivecopper(I)-catalyzedallylic substitution of protected δ-hydroxy allylic chlorides with a silicon nucleophile generated by Si–B bond activation provides diastereoselective access to β-hydroxy α-chiralallylicsilanes with an anti relative configuration. The high levels of diastereocontrol of this rare allylic displacement are interpreted according to a model suggested by Nakamura
Synthesis of Cyclic N-Tosyliminocarbonates by Lewis Acid Catalyzed Allylic Substitution of Trichloroacetimidates
作者:Liene Grigorjeva、Aigars Jirgensons
DOI:10.1002/ejoc.201200378
日期:2012.9
Allylic trichloroacetimidates bearing a δ-N-tosylcarbamoyloxy group were prepared in two steps from the corresponding diols, and their Bronsted and Lewisacidcatalyzed cyclization reactions were investigated. It was found that N-tosylcarbamates derived from secondary and tertiary alcohols bearing alkyl substituents undergo a chemoselective allylic alkylation to give N-tosyliminocarbonates in good