Stereoselective Synthesis of Z Fluoroalkenes through Copper-Catalyzed Hydrodefluorination of <i>gem</i>
-Difluoroalkenes with Water
作者:Jiefeng Hu、Xiaowei Han、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201708224
日期:2017.10.16
A copper catalytic system was established for the stereoselective hydrodefluorination of gem‐difluoroalkenes through C−F activation to synthesize various Z fluoroalkenes. H2O is used as the hydrogen source for the fluorine acceptor moiety. This mild catalytic system shows good‐functional group compatibility, accepting a range of carbonyls as precursors to the gem‐difluoroalkenes, including aliphatic
[3 + 2]-Annulation of <i>gem</i>-Difluoroalkenes and Pyridinium Ylides: Access to Functionalized 2-Fluoroindolizines
作者:Jun-Qi Zhang、Dandan Hu、Jinyu Song、Hongjun Ren
DOI:10.1021/acs.joc.0c03041
日期:2021.3.19
A [3 + 2]-annulation of gem-difluoroalkenes and pyridinium ylides was developed employing ambient air as the sole oxidant in an open-vessel manner, affording a series of multifunctionalized 2-fluoroindolizines in moderate to good yields. In this reaction, gem-difluoroalkene acts as a C2 synthon and entirely avoids the competitive addition–elimination process, which provides facile access to 2-fluoroindolizines
The manganese-catalyzed α-fluoroalkenylation of arenes via C–Hactivation and C–F cleavage has been described. This protocol provides a very useful method for the synthesis of monofluoroalkenes with predominant unconventional E-isomer selectivity which complements the existing strategies for the access to these molecular architectures. In addition, the selectivity of β-defluorination in the catalytic
Synthesis of Alkylated Monofluoroalkenes via Fe-Catalyzed Defluorinative Cross-Coupling of Donor Alkenes with <i>gem</i>-Difluoroalkenes
作者:Ling Yang、Wei-Wei Ji、E Lin、Ji-Lin Li、Wen-Xin Fan、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.8b00471
日期:2018.4.6
A reductive cross-coupling of gem-difluoroalkenes with diverse unactivated and heteroatom substituted olefins through a Fe-catalyzed hydrogen atom transfer (HAT) strategy is reported. Different from the previous HAT-type olefin cross-coupling reactions, the presence of a fluorineatom in the molecule results in a stereoselective β-F cleavage, leading to a C(sp2)–C(sp3) bond formation. A wide variety
applied to the corresponding furan systems, which led to pinpoint-fluorinated naphtho[b]furans. INTRODUCTION Sulfur-containing π-extended molecules have attracted an increasing amount of attention as organic electronic materials. In particular, oligoand polythiophenes, where every two thiophene rings are connected to each other by a single bond, have been studied from the very early stage of this chemistry