Nickel-Catalyzed Enantioselective Reductive Aryl Fluoroalkenylation of Alkenes
作者:Teng Ma、Yate Chen、Yuxiu Li、Yuanyuan Ping、Wangqing Kong
DOI:10.1021/acscatal.9b03172
日期:2019.10.4
Enantioselective Ni-catalyzed reductive aryl monofluoroalkenylation of alkenes between aryl bromides and gem-difluoroalkenes has been developed. The reaction proceeding under room temperature and base-free reaction conditions tolerates a wide range of functional groups on both coupling partners. Various synthetically useful oxindoles containing monofluoroalkenyl substituent are obtained in good yields with
Visible-light-promoted<i>E</i>-selective synthesis of α-fluoro-β-arylalkenyl sulfides<i>via</i>the deoxygenation/isomerization process
作者:Yuxiu Li、Xiangqian Li、Xiaowei Li、Dayong Shi
DOI:10.1039/d0cc08254f
日期:——
Regioselective synthesis of α-fluoro-β-arylalkenyl sulfides has been established with gem-difluoroalkenes and sodium sulfinates in a transition-metal-free manner. A series of control experiments were executed to demonstrate thiol radicals and anions as the proposed intermediates. Notably, regioselective Z → E isomerization was achieved under green light irradiation in the absence of a photoinitiator
Stereodivergent hydrodefluorination of gem-difluoroalkenes: selective synthesis of (Z)- and (E)-monofluoroalkenes
作者:Ryoto Kojima、Koji Kubota、Hajime Ito
DOI:10.1039/c7cc05225a
日期:——
We have developed a novel approach for the stereodivergent hydrodefluorination of gem-difluoroalkenes using copper(I) catalysts to obtain stereodefined monofluoroalkenes. Both (Z)- and (E)-terminal monofluoroalkenes were obtained by hydrodefluorination of gem-difluoroalkenes in the presence of copper(I) catalysts and diboron or hydrosilane, respectively, with high stereoselectivity. DFT calculations
Radical-Polar Crossover Catalysis with a d<sup>0</sup> Metal Enabled by a Redox-Active Ligand
作者:Joshua T. Gavin、Roman G. Belli、Courtney C. Roberts
DOI:10.1021/jacs.2c09114
日期:2022.11.30
Through use of a redox-active (tris)amido ligand we have accessed this mechanism for use with early transition metals. This mechanism is showcased through enabling product formation for a wide variety of elimination products from α-halo substituted benzylic bromides. The mechanism of this new type of reactivity with Sc is explored, and Hammett analysis reveals an anionic intermediate. The wide functional
作者:Ivan Volchkov、Brent V. Powell、Olga V. Zatolochnaya、Joyce C. Leung、Scott Pennino、Lifen Wu、Nina C. Gonnella、Bangaru Bhaskararao、Marisa C. Kozlowski、Jonathan T. Reeves
DOI:10.1021/acs.joc.3c00917
日期:2023.8.4
The synthesis of di- and trisubstituted vinyl fluorides with high isomeric purity remains a challenge for organic synthesis. While many methods exist to access these compounds, the separation of the desired isomer from the minor isomer and/or starting materials often is difficult. Herein, we report a practical method to access di- and trisubstituted vinyl fluorides via a selective Horner–Wadsworth–Emmons