NiH‐Catalyzed Migratory Defluorinative Olefin Cross‐Coupling: Trifluoromethyl‐Substituted Alkenes as Acceptor Olefins to Form
<i>gem</i>
‐Difluoroalkenes
a NiH-catalyzed migratory defluorinative coupling between two electronically differentiated olefins. A broad range of unactivated donor olefins can be joined directly to acceptor olefins containing an electron-deficient trifluoromethyl substituent in both intra- and intermolecular fashion to form gem-difluoroalkenes. This migratory coupling shows both site- and chemoselectivity under mild conditions
Redox-Neutral Photocatalytic Cyclopropanation via Radical/Polar Crossover
作者:James P. Phelan、Simon B. Lang、Jordan S. Compton、Christopher B. Kelly、Ryan Dykstra、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/jacs.8b05243
日期:2018.6.27
A benchtop stable, bifunctional reagent for the redox-neutral cyclopropanation of olefins has been developed. Triethylammonium bis(catecholato)iodomethylsilicate can be readily prepared on multigram scale. Using this reagent in combination with an organic photocatalyst and visible light, cyclopropanation of an array of olefins, including trifluoromethyl- and pinacolatoboryl-substituted alkenes, can
redox neutral γ,γ-difluoroallylation of cycloketone oxime ethers with trifluoromethyl alkenes through C–C and C–Fbond cleavage has been achieved, which affords various cyano-substituted gem-difluoroalkenes in generally good yields. The reaction provides a facile protocol for forming gem-difluoroalkene functionality and a cyano group while incorporating them into one molecule. The conversion of the resulting
Direct C(sp3)−H difluoroallylation of diarylmethanes with α-(trifluoromethyl) styrenes at room temperature
作者:Xinfei Ji、Yisen Liu、Hongyan Shi、Song Cao
DOI:10.1016/j.tet.2018.06.018
日期:2018.8
A rapid and convenient method for the synthesis of 3,3-difluoroallylated diarylmethanes by reactions of diarylmethanes with α-(trifluoromethyl)styrenes in the presence of LiHMDS at room temperature was developed.
Synthesis of difluoromethylated enynes by the reaction of α-(trifluoromethyl)styrenes with terminal alkynes
作者:Mingsheng Wu、Xianghu Zhao、Yisen Liu、Song Cao
DOI:10.1039/c8ob02117a
日期:——
A novel and efficient method for the synthesis of difluoromethylated enynes by the reaction of α-(trifluoromethyl)styrenes with terminal alkynes with the assistance of NaOtBu was described. The mechanism of the reaction might involve the SN2′ reaction of α-(trifluoromethyl)styrenes and a subsequent 1,3-H shift. Isomerization (E → Z) of 1-difluoromethyl-1,3-enynes in the presence of ZrCl4 was also developed
描述了一种新颖有效的合成方法,该方法通过NaO t Bu协助α-(三氟甲基)苯乙烯与末端炔烃的反应合成二氟甲基化的炔烃。该反应的机理可能涉及在S Ñ α-(三氟甲基)苯乙烯的2'反应和随后的1,3--H转变。还开发了在ZrCl 4存在下1-二氟甲基-1,3-烯炔的异构化(E →Z)。