α-Arylation of ketones by aryllead triacetates. Effect of methyl and phenyl substitution at the α position
作者:Jacqueline Morgan、John T. Pinhey、Bruce A. Rowe
DOI:10.1039/a607543f
日期:——
An examination of the α-arylation of a number of
ketones and their enolate salts by p-methoxyphenyllead
triacetate provides further evidence for a very marked
selectivity in the arylation reaction. It is found that the
reaction proceeds well at tertiary α-carbons and at
secondary centres activated by the presence of a phenyl group,
but fails where the secondary centre is unactivated and at
primary α-carbons.
1,4‐Diketones from Cross‐Conjugated Dienones: Potassium Permanganate‐Interrupted Nazarov Reaction
作者:Yonghoon Kwon、Devon J. Schatz、Frederick G. West
DOI:10.1002/anie.201503696
日期:2015.8.17
3‐disubstituted 1,4‐diketones via a decarbonylative cleavage of the Nazarov oxyallyl intermediate, believed to be without precedent, is presented. This process allows syn substituents to be established stereospecifically on the 2‐carbon bridge connecting the ketone carbonyl carbons, and the formation of one carbon–carbon and twocarbon–oxygenbonds. Two carbon–carbon bonds are cleaved in this process.