Enantioselective construction of stereogenic quaternary centres via Rh-catalyzed asymmetric addition of alkenylboronic acids to α,β-unsaturated pyridylsulfones
Enantioselective construction of stereogenic quaternary centres via Rh-catalyzed asymmetric addition of alkenylboronic acids to α,β-unsaturated pyridylsulfones
作者:Pablo Mauleón、Juan C. Carretero
DOI:10.1039/b508142d
日期:——
The highly enantioselective construction of all-carbon quaternary stereogenic centres via Rh-catalyzed Chiraphos-mediated conjugate addition of alkenylboronic acids to β,β-disubstituted α,β-unsaturated 2-pyridylsulfones is described.
Palladium-Catalyzed Remote<i>ortho</i>-CH Alkenylation of Alkyl Aryl Sulfones: Access to Densely Functionalized Indane Derivatives
作者:Pablo D. Legarda、Alfonso García-Rubia、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/adsc.201501129
日期:2016.3.31
A practical method for the palladium‐catalyzed ortho‐olefination of benzyl and phenethyl 2‐pyridyl sulfones with electron‐deficient alkenes using N‐fluoro‐2,4,6‐trimethylpyridinium triflate ([F+]) as the terminal oxidant is described. The chelating auxiliary (2‐pyridyl)sulfonyl unit was demonstrated to be the key to the success of this reaction, which occurs efficiently with excellent regioselectivity