Rhenium‐Catalyzed Decarboxylative Tri‐/Difluoromethylation of Styrenes with Fluorinated Carboxylic Acid‐Derived Hypervalent Iodine Reagents
作者:Yin Wang、Yunhui Yang、Congyang Wang
DOI:10.1002/cjoc.201900296
日期:2019.12
Herein, unprecedented rhenium‐catalyzed decarboxylative oxytri‐/difluoromethylation and Heck‐type trifluoromethylation of styrenes have been developed by using hypervalent iodine(III) reagents derived from cheap, stable, and easy‐handling fluorinated carboxylic acids. Mechanistic studies revealed a radical decarboxylative trifluoromethylation pathway occurring in these reactions.
Starting from Styrene: A Unified Protocol for Hydrotrifluoromethylation of Diversified Alkenes
作者:Yi-Fei Yang、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1021/acs.orglett.1c03630
日期:2021.12.3
In contrast with unactivated alkenes, the corresponding hydrotrifluoromethylation of styrene has remained challenging due to the strong propensity of styrene for oligomerization and polymerization. On the basis of our newly developed trifluoromethylation reagent, TFSP, herein we present a general method for the hydrotrifluoromethylation of styrene under photoredox catalysis. The substrate scope was
Enantioselective Construction of Quaternary All-Carbon Centers via Copper-Catalyzed Arylation of Tertiary Carbon-Centered Radicals
作者:Lianqian Wu、Fei Wang、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b13052
日期:2019.2.6
An enantioselective copper-catalyzed arylation of tertiary carbon-centered radicals, leading to quaternary all-carbon stereocenters, has been developed herein. The tertiary carbon-centered radicals, including both benzylic and nonbenzylic radicals, were produced by the addition of trifluoromethyl radical to α-substituted acrylamides, and subsequently captured by chiral aryl copper(II) species to give
本文开发了一种对映选择性铜催化的叔碳中心基团芳基化,导致季全碳立体中心。叔碳中心自由基,包括苄基和非苄基自由基,是通过将三氟甲基自由基加成到 α-取代的丙烯酰胺中产生的,随后被手性芳基铜 (II) 物种捕获,以产生具有优异对映选择性的 C-Ar 键。重要的是,与叔碳自由基相邻的酰基酰胺基 (CONHAr) 基团对于不对称自由基偶联至关重要。该反应本身具有底物范围广、官能团相容性好、条件温和等特点。
Asymmetric Coupling of Carbon‐Centered Radicals Adjacent to Nitrogen: Copper‐Catalyzed Cyanation and Etherification of Enamides
作者:Guoyu Zhang、Song Zhou、Liang Fu、Pinhong Chen、Yibiao Li、Jianping Zou、Guosheng Liu
DOI:10.1002/anie.202008338
日期:2020.11.9
The first copper‐catalyzed asymmetric cyanation and etherification reactions of enamides have been established, where a carbon‐centered radical adjacent to a nitrogen atom (CRAN) is enantioselectively trapped by a chiral copper(II) species. Moreover, the asymmetric cyanation of vinyl esters was disclosed as well. These reactions feature very mild reaction conditions and high functional group tolerance