Transition metal free decarboxylative fluorination of cinnamic acids with selectfluor®
作者:Cheng-Tan Li、Xi Yuan、Zhen-Yu Tang
DOI:10.1016/j.tetlet.2016.11.003
日期:2016.12
Herein we report a transition metal free decarboxylative fluorination of cinnamic acids with selectfluor®. A range of functionalized cinnamic acid derivatives reacted with 2 equiv. of selectfluor® and 4 equiv. of base in hydrophobic solvent and water to afford β-fluorostyrene with good yield and Z-stereoselectivity. Kinetic study was conducted.
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
Synthesis of monofluoroalkenes through selective hydrodefluorination of gem-difluoroalkenes with Red-Al®
作者:Jingjing Wu、Juan Xiao、Wenpeng Dai、Song Cao
DOI:10.1039/c5ra04221f
日期:——
A practical approach for the selective hydrodefluorination of gem-difluoroalkenes using Red-Al® as reductant at room temperature in CH2Cl2 was reported. Monofluoroalkenes were obtained in moderate to high yields with good E-selectivity.
Acceleration of alkenyltrimethylsilane fluorination under mild conditions using ultrasound
作者:Reza Ranjbar-Karimi
DOI:10.1016/j.ultsonch.2010.02.007
日期:2010.6
Alkenyltrimethylsilanes are selectively fluorodesilated to alkenyl fluoride very readily by reaction with 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2,2,2]octane bis-tetrafluoroborate (Selectfluor) and N-fluorobenzensulfonimids at room temperature under ultrasound. In the presence of ultrasound irradiation in the case atone of the reactions, the yield was 85% after 25 min, but using the previously established thermal method the yield was only 32% after 20 h. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.