Practical, Broadly Applicable, α-Selective, <i>Z</i>-Selective, Diastereoselective, and Enantioselective Addition of Allylboron Compounds to Mono-, Di-, Tri-, and Polyfluoroalkyl Ketones
作者:Farid W. van der Mei、Changming Qin、Ryan J. Morrison、Amir H. Hoveyda
DOI:10.1021/jacs.7b05011
日期:2017.7.5
accessible unsaturated organoboron compounds serve as reagents. Transformations were performed with 0.5-2.5 mol % of a boron-based catalyst, generated in situ from a readily accessible valine-derived aminophenol and a Z- or an E-γ-substituted boronic acid pinacol ester. With a Z organoboron reagent, additions to trifluoromethyl and polyfluoroalkyl ketones proceeded in 80-98% yield, 97:3 to >98:2 α:γ selectivity
Rh-Catalyzed arylation of fluorinated ketones with arylboronic acids
作者:Luca S. Dobson、Graham Pattison
DOI:10.1039/c6cc05775f
日期:——
The Rh-catalyzed arylation of fluorinated ketones with boronic acids is reported. This efficient process allows access to fluorinated alcohols in high yields under mild conditions. Competition experiments suggest that difluoromethyl...
Direct Deprotonative Functionalization of α,α‐Difluoromethyl Ketones using a Catalytic Organosuperbase
作者:Amélia Messara、Armen Panossian、Koichi Mikami、Gilles Hanquet、Frédéric R. Leroux
DOI:10.1002/anie.202215899
日期:2023.3
instability of the generated carbanion that can evolve into a fluorocarbene. A method for the deprotonative functionalization of these compounds is described herein under an organocatalytic system using various electrophiles, and is also applied to a related α,α-difluoromethyl sulfoxide. This strategy gives access to highly valuable difluoromethylene scaffolds.
silyl ethers as intermediates that react with various electrophiles to generate defluorinated ketones as the products. Moreover, in combination with peroxide, a 1,2-shift of fluoroalkyl group is favored over deboronative fluoride elimination to generate ketal intermediates, leading to the formation of ketones as the products. This transition-metal-free reaction is operationally simple, and aryl, alkenyl