Rhodium-catalyzed asymmetric hydroboration of γ,δ-unsaturated amide derivatives: δ-borylated amides
作者:G. L. Hoang、S. Zhang、J. M. Takacs
DOI:10.1039/c8cc01563e
日期:——
γ,δ-Unsaturated amides in which the alkene moiety bears an aryl or heteroaryl substituent undergo regioselective rhodium-catalyzed δ-borylation by pinacolborane to afford chiral secondary benzylic boronic esters. The results contrast the γ-borylation of γ,δ-unsaturated amides in which the disubstituted alkene moiety bears only alkyl substituents; the reversal in regiochemistry is coupled with a reversal
作者:Angus W.J. Logan、Jeremy S. Parker、Michal S. Hallside、Jonathan W. Burton
DOI:10.1021/ol300625u
日期:2012.6.15
Manganese(III) acetatemediated oxidative radicalcyclizations have been used to synthesize a range of densely functionalized and sterically congested cyclopentane-lactones. A number of the resulting lactones contain vicinal all-carbon quaternary stereocenters adjacent to a tertiary benzylic stereocenter and are formed with high levels of stereocontrol.