Synthesis of monofluoroalkenes via Julia–Kocienski reaction
作者:G.K. Surya Prakash、Anton Shakhmin、Mikhail Zibinsky、Istvan Ledneczki、Sujith Chacko、George A. Olah
DOI:10.1016/j.jfluchem.2010.06.009
日期:2010.11
Monofluoromethyl 3,5-bis(trifluoromethyl)phenyl sulfone 1 was synthesized and employed in Julia–Kocienski fluoroolefination reaction with various ketones and aldehydes. Optimal reaction conditions were found to be the treatment of substrates with KOH or CsF in DMSO at room temperature. Mixtures of (E) and (Z) isomers of monofluoroalkenes 4 were obtained in moderate to excellent yields. Download : Download
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.
Generation of Acetylides by Treatment of Fluoroethylenes with LDA: Preparation of Propargyl Alcohols
作者:Kentaro Kataoka、Sadao Tsuboi
DOI:10.1055/s-2000-6336
日期:——
The fluoroethylenes 3 produced the corresponding acetylides via dehydrofluorination and deprotonation by treatment with 2 equivalents of LDA in THF at 0 °C. These acetylides reacted with aldehydes and ketones to afford propargyl alcohols in good yields.
氟乙烯 3 通过脱氢氟化和去质子化,在 0 °C 的四氢呋喃溶液中用 2 个等量的 LDA 处理,生成相应的乙酰化物。这些乙酰化物与醛和酮反应生成丙炔醇,收率很高。