HFO‐1234yf as a CF
<sub>3</sub>
‐Building Block: Synthesis and Chemistry of CF
<sub>3</sub>
‐Ynones
作者:Ben J. Murray、Thomas G. F. Marsh、Dmitri S. Yufit、Mark A. Fox、Antal Harsanyi、Lee T. Boulton、Graham Sandford
DOI:10.1002/ejoc.202001071
日期:2020.10.22
diisopropylamide (LDA) leads to formation of lithium 3,3,3‐trifluoropropynide, addition of which to a range of aldehydes formed CF3‐alkynyl alcohol derivatives on multigram scale, which were oxidised using Dess‐Martin periodinane (DMP) to give substituted CF3‐ynones with minimal purification required. Michael‐type additions of alcohol and amine nucleophiles to CF3‐ynones are rapid and selective, affording
A novel synthetic approach to fluorine-containing acetylenic compounds based on Nicholas reaction
作者:Tsutomu Konno、Go Nagai、Takashi Ishihara
DOI:10.1016/j.jfluchem.2005.11.009
日期:2006.5
The fluorine-containing dicobalthexacarbonyl complex, prepared readily from γ-fluoroalkylated propargyl acetates and Co2(CO)8, reacted smoothly with various nucleophiles at the propargylic position, followed by oxidative decomplexation under the influence of Fe(NO3)3, to afford fluoroalkylated alkynes bearing various types of alkyl side chains in good to high yields.
Stereospecific Asymmetric N-Heterocyclic Carbene (NHC)-Catalyzed Redox Synthesis of Trifluoromethyl Dihydropyranones and Mechanistic Insights
作者:Alyn T. Davies、James E. Taylor、James Douglas、Christopher J. Collett、Louis C. Morrill、Charlene Fallan、Alexandra M. Z. Slawin、Gwydion Churchill、Andrew D. Smith
DOI:10.1021/jo401433q
日期:2013.9.20
N-Heterocyclic carbene (NHC)-catalyzed redox asymmetric hetero-Diels-Alder reactions of alpha-aroyloxyaldehydes with beta-trifluoromethyl enones generates synthetically useful dihydropyranones containing a stereogenic trifluoromethyl substituent in good yields (up to 81%) and excellent diastereoselectivity and enantioselectivity (up to >95:5 dr and >99% ee). The process is stereospecific, with use of either (E)- or (Z)-beta-trifluoromethyl enones forming syn- or anti-dihydropyranone products, respectively. Mechanistic studies through in situ kinetic analysis of the reaction reveal key differences in reactivity between chiral NHC precursor 1 and an achiral NHC precursor.
Direct access to trifluoromethylated α-hydroxyketones from silver-catalyzed hydroacyloxylation of trifluoromethyl propynols with acids
作者:Xiao-Fang Song、Li-Jing Zhang、Xing-Guo Zhang、Hai-Yong Tu