Site isolated base and acid catalyzed azaspirocyclization cascades
作者:Adam W. Pilling、Jutta Böhmer、Darren J. Dixon
DOI:10.1039/b716568d
日期:——
A one-pot, site isolated base (PS-BEMP) and acid (Si-TsOH) catalyzed cyclization cascade to azaspirocyclic molecules is reported; the reaction is simple to perform, atom efficient (water is the only byproduct) and broad in its scope to a diverse range of azaspirocyclic products.
Construction of perhydro indol-2-ones by a methoxide catalyzed deacetylation–Michael–aldol cascade
作者:John W. Ward、Karen Dodd、Caroline L. Rigby、Chris De Savi、Darren J. Dixon
DOI:10.1039/b924637a
日期:——
An efficient, stereoselective Michaelâaldol cascade for the one-pot construction of the perhydro indol-2-one bicyclic ring system using an acetate protected doubly-activated pyrrole-2-one pro-nucleophile and α,β-unsaturated carbonyl compounds has been developed. Initiated by a methoxide deacetylation in methanol at room temperature, the cascade is easy to perform, stereoselective, efficient and broad in scope to this synthetically relevant structure.
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.