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.
Direct Carbocyclization of Aldehydes with Alkynes: Combining Gold Catalysis with Aminocatalysis
作者:Jörg T. Binder、Benedikt Crone、Timm T. Haug、Helge Menz、Stefan F. Kirsch
DOI:10.1021/ol800092p
日期:2008.3.1
A combination of gold(l) complexes and amine bases catalyzes the 5-exo-dig cyclization of formyl alkynes. This direct alpha-functionalization of aldehydes with unactivated alkynes does not involve the use of preformed enol equivalents.