Copper(I)-catalyzed Stereoselective Defluoroborylation of Aliphatic <i>Gem</i>-Difluoroalkenes
作者:Hajime Ito、Tamae Seo、Ryoto Kojima、Koji Kubota
DOI:10.1246/cl.180656
日期:2018.10.5
This study reports a method for the stereoselective copper(I)-catalyzed defluoroborylation of aliphatic gem-difluoroalkenes to afford (Z)-monofluoro-substituted borylalkenes. Gem-difluoroalkenes bearing a variety of functional groups were efficiently borylated with high stereoselectivity. A theoretical study of the reaction mechanism is also described.
thane has been demonstrated to be a highly versatile gem-difluoromethylene (CF2) buildingblock via the reaction of difluorophenylsulfanylmethyl radical with olefins. gem-Difluoroalkenes and products containing a midchain CF2 group and with manipulatable functionality can be readily synthesized. The first example of a gem-difluoromethylene radical synthon is also reported.
hydroarylation of 1,3,5‐trifluorobenzene and pentafluorobenzene with ethylene and propylene. The alkylations of arenes with non‐fluorinated olefins resemble typical Friedel–Crafts chemistry to give rise to Markovnikov regioselectivity. The reaction of CF3CH=CH2 with benzene proceeds with anti‐Markovnikov regioselectivity to give the fluorinated olefin PhCHCH=CF2 and the alkylation product PhCH2CH2CF3 as products
Stereoselective formation of Z-monofluoroalkenes by nickel-catalyzed defluorinative coupling of gem‑difluoroalkenes with lithium organoborates
作者:Yisa Xiao、Weichen Huang、Qilong Shen
DOI:10.1016/j.cclet.2022.01.020
日期:2022.9
method for stereoselective construction of Z-monofluoroalkenes by nickel-catalyzed defluorinative coupling of gem‑difluoroalkenes in mild conditions was described. The combination of lithiumorganoborate and ZnBr2 generated in situ lithiumaryl zincates, which facilitates the transmetalation step of the nickel-catalyzed cross couplingreaction.
Copper-Catalyzed Stereoselective Defluorinative Borylation and Silylation of <i>gem</i>
-Difluoroalkenes
作者:Dong-Hang Tan、E Lin、Wei-Wei Ji、Yao-Fu Zeng、Wen-Xin Fan、Qingjiang Li、Hui Gao、Honggen Wang
DOI:10.1002/adsc.201701497
日期:2018.3.1
The copper‐catalyzed stereoselectivedefluorinativeborylation and silylation of gem‐difluoroalkenes was developed. The protocol led to the exclusive formation of Z type monofluoroalkenyl borons and silanes in generally good efficiency with broad substrate scope. The products formed could be readily transformed to other F‐containing molecules by taking advantage of the versatile reactivities of C−B