甲硅烷基化的氟代烯烃是具有互补反应性的重要合成中间体,在天然产物,药物和人造材料的构造中起关键作用。通过选择性脱氟甲硅烷基化将通常高度稳定的氟代烯烃转化为甲硅烷基化的氟代烯烃是一项艰巨的任务。本文中,我们报道了在烷氧基碱的存在下,各种氟代烯烃与甲硅烷基硼酸酯的简单,廉价和稳健的脱氟甲硅烷基化反应,以直接合成各种甲硅烷基化的氟代烯烃。该协议具有温和而安全的反应条件,可避免催化剂,过渡金属,配体和高反应温度,并能耐受各种氟代烯烃底物,而不会影响效率。N 2'或S N V取代,这是该碱基介导的脱氟甲硅烷基化的原因。
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
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
Palladium-catalyzed multi components oxy-aminofluorination and aminofluorination of gem-difluoroalkenes
作者:Fen Wu、Xin Li、Junbiao Chang、Dachang Bai
DOI:10.1016/j.cclet.2023.109155
日期:2024.2
of α-trifluoromethyl benzylic amines. Notably, three/four components oxy-aminofluorination processes were realized to give α-trifluoromethyl benzylicether with a terminal amino group, which proceed through C(sp3)–O bond cleavage of easily available ether and simultaneous introduced a fluorine, an amino and an oxy substituent in one pot with excellent regioselectivity. The divergent reactivity not only