Asymmetric Oxidation of Enol Derivatives to α-Alkoxy Carbonyls Using Iminium Salt Catalysts: A Synthetic and Computational Study
作者:Philip C. Bulman Page、Saud M. Almutairi、Yohan Chan、G. Richard Stephenson、Yannick Gama、Ross L. Goodyear、Alice Douteau、Steven M. Allin、Garth A. Jones
DOI:10.1021/acs.joc.8b02354
日期:2019.1.18
We report herein the first examples of asymmetricoxidation of enol ether and ester substrates using iminium salt organocatalysis, affording moderate to excellent enantioselectivities of up to 98% ee for tetralone-derived substrates in the α-hydroxyketone products. A comprehensive density functional theory study was undertaken to interpret the competing diastereoisomeric transition states in this example
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
Highly enantioselective epoxidation of enol silyl ethers and esters
作者:Yuanming Zhu、Yong Tu、Hongwu Yu、Yian Shi
DOI:10.1016/s0040-4039(98)01711-0
日期:1998.10
High enantioselectivities have been obtained for asymmetricepoxidation of enol silyl ethers and asters using a fructose-derived chiral ketone as catalyst and Oxone as oxidant.
Catalytic asymmetric Simmons–Smith cyclopropanation of unfunctionalized olefins
作者:Jiang Long、Haifeng Du、Kai Li、Yian Shi
DOI:10.1016/j.tetlet.2005.02.161
日期:2005.4
This paper describes a catalyticasymmetric cyclopropanation system for unfunctionalized olefins using readily available dipeptide N-Boc-l-Val-l-Pro-OMe (1) as ligand.
Palladium-Catalyzed Intermolecular Oxyarylation of Vinylacetates with Retention of an Alkenyl Moiety
作者:Sheng-Qi Qiu、Yun-He Xu、Teck-Peng Loh
DOI:10.1021/acs.orglett.5b01507
日期:2015.7.17
Palladium-catalyzed intermolecular oxyarylation reaction of vinylacetates with retention of the double bond in the final product is developed. Under the optimized reaction conditions, the desired products of multisubstituted vinylesters could be obtained in moderate to high yields.