Impact of Silyl Enol Ether Stability on Palladium-Catalyzed Arylations
作者:Yong Guo、Guo-Hong Tao、Alex Blumenfeld、Jean’ne M. Shreeve
DOI:10.1021/om1000259
日期:2010.4.12
The effect of stability on arylation of silyl enolethers as dictated by the presence of bulky silyl groups was elucidated through experiment and calculation. With the enhancement of stability of the silyl enolethers, especially of acyclic ethers, the efficiency of palladium-catalyzed arylation of silyl enolates based on ketone precursors was greatly increased.
Pd-catalyzed arylation of silyl enol ethers of substituted α-fluoroketones
作者:Yong Guo、Brendan Twamley、Jean'ne M. Shreeve
DOI:10.1039/b900311h
日期:——
the Pd-catalyzed cross-coupling of aryl bromides with either α-fluoroketones or their corresponding silyl enol ethers. The direct arylation with an α-fluoroketone requires a strong base, such as potassium tert-butoxide, and under these conditions the presence of a base-sensitive functional group is not compatible. However, good functional tolerance was achieved when the anionic coupling moieties were
The Electrophilic Fluorination of Enol Esters Using SelectFluor: A Polar Two‐Electron Process
作者:Susanna H. Wood、Stephen Etridge、Alan R. Kennedy、Jonathan M. Percy、David J. Nelson
DOI:10.1002/chem.201900029
日期:2019.4.11
facile and leads to the corresponding α‐fluoroketones under mild conditions and, as a result, this route is commonly employed for the synthesis of medicinally important compounds such as fluorinated steroids. However, despite the use of this methodology in synthesis, the mechanism of this reaction and the influence of structure on reactivity are unclear. A rigorous mechanistic study of the fluorination