Nickel-Catalyzed Alkynylation of Anisoles via C–O Bond Cleavage
摘要:
A new cross-coupling reaction has been developed for the introduction of an alkyne moiety to an anisole derivative through C-O bond activation using an NHC ligand. This method has been used for direct alkynylation of a broad range of anisole derivatives and provided rapid access to compounds with potential applications in biological and materials science.
Nickel-Catalyzed Alkynylation of Anisoles via C–O Bond Cleavage
摘要:
A new cross-coupling reaction has been developed for the introduction of an alkyne moiety to an anisole derivative through C-O bond activation using an NHC ligand. This method has been used for direct alkynylation of a broad range of anisole derivatives and provided rapid access to compounds with potential applications in biological and materials science.
A formalinsertion reaction of two molar amounts of arynes into a C−H bond of terminal alkynes is efficaciously catalyzed by copper(I) chloride, giving 2-alkynylbiaryls in one step.
FeCl<sub>3</sub>
-Mediated Oxidative Spirocyclization of Difluorenylidene Diarylethanes Leading to Dispiro[fluorene-9,5′-indeno[2,1-<i>a</i>
]indene-10′,9′′-fluorene]s
作者:Jian Zhao、Zhanqiang Xu、Kazuaki Oniwa、Naoki Asao、Yoshinori Yamamoto、Tienan Jin
DOI:10.1002/anie.201507794
日期:2016.1.4
A novel FeCl3‐mediated oxidativespirocyclization for construction of a new class of di‐spirolinked π‐conjugated molecules, dispiro[fluorene‐9,5′‐indeno[2,1‐a]indene‐10′,9′′‐fluorene]s (DSFIIFs), has been reported. The combination of FeCl3 with FeO(OH) triggered an unprecedented double one‐electron oxidation of difluorenylidenediarylethanes to afford the corresponding dispirocycles in high yields
一种新型的FeCl 3介导的氧化螺环化反应,用于构建新型的双螺链连接的π共轭分子,即双螺[芴-9,5'-茚并[2,1- a ]茚10-10,9'-芴] s(DSFIIFs),已被报道。FeCl 3与FeO(OH)的结合引发了二芴基二芳基乙烷的前所未有的双单电子氧化,从而以高收率提供了相应的二螺环。溶液中的最高荧光量子产率高达0.94。该方案也适用于非螺旋连接的二氢茚并茚的合成。
Electrochemical Annulation of <i>ortho</i>‐Alkynylbiphenyls to Fused Sulfenyl Phenanthrenes and Spiro Cyclohexenone Indenes
10 mA in an undivided cell setup by utilizing CH3CN as a solvent and LiClO4 as an electrolyte at room temperature. Notably, the present strategy enabled the formation of sulfenylphenanthrenes and sulfenyl spiro cyclohexa[4.5]trienones in 70%–95% yield. Scale-up synthesis, mechanistic studies, and cyclic voltammetry have also been carried out.