1-[m-(Ethoxydimethylsilyl)phenyl]-3-[p-(ethoxydimethylsilyl)phenyl]-hexafluoropropane and Its Cyclization to a Fluorinated Oxadisila-[3.3]metaparacyclophane
Enantio‐, Diastereo‐ and Regioselective Synthesis of Chiral Cyclic and Acyclic
<i>gem</i>
‐Difluoromethylenes by Palladium‐Catalyzed [4+2] Cycloaddition
A Pd-catalyzed asymmetric [4+2] cycloaddition between substituted-2-alkylidenetrimethylene carbonates and cyclic or acyclic gem-difluoroalkyl ketones enabled the synthesis of chiral gem-difluoromethylene compounds. A novel phosphoramidite ligand, which contains a bulky 1,1-dinaphthylmethanamino moiety, was the key to providing high yield products with excellent enantio-, diastereo-, and regioselectivity
Asymmetric Partial Hydrosilylation of 2,<scp>2‐Difluoro</scp>‐1,3‐diketones with Chiral Frustrated Lewis Pairs
作者:Ting Liu、Xiangqing Feng、Haifeng Du
DOI:10.1002/cjoc.202300675
日期:2024.4.15
The asymmetric partial reduction of 1,3-diketones stands as a straightforward pathway to access optically active β-hydroxyketones. In this paper, an asymmetric Piers-type hydrosilylation of 2,2-difluoro-1,3-diketones was successfully realized by using a frustrated Lewis pair of chiral borane and tricyclohexylphosphine as a catalyst, delivering a variety of α,α-difluoro-β-hydroxyketones in high yields