Combination iminium, enamine and copper(i) cascade catalysis: a carboannulation for the synthesis of cyclopentenes
作者:Ting Yang、Alessandro Ferrali、Leonie Campbell、Darren J. Dixon
DOI:10.1039/b802416b
日期:——
A one-pot, multistep reaction cascade to cyclopentenes from alpha,beta-unsaturated ketones and propargylated carbon acids through a combination of organocatalysis and transition metal ion catalysis is reported; the reaction cascade is simple to perform, occurs under mild conditions and is broad in scope.
Gold-Catalyzed 5- and 6-exo-dig Selective Cyclizations of Alkynyl Silyl Enol Ethers: Efficient Method for [3+2] and [4+2] Annulations onto α,β-Enones
作者:Kooyeon Lee、Phil Ho Lee
DOI:10.1002/adsc.200700304
日期:2007.9.3
An efficient method for the annulation of five- and six-membered rings onto α,β-enones is described via gold-catalyzed 5- and 6-exo-dig selective cyclizations of alkynyl silyl enolethers.