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.
Novel synthetic pathway to access trifluoromethylated allenes with 1,3-di- as well as 1,1,3-trisubstitution patterns was developed from a variety of 4,4,4-trifluorobut-2-yn-1-ols which were then transformed into the corresponding vinylic iodides in highly regio- and stereospecific manners, and zinc-mediated β-elimination after trifluoroacetylation of the hydroxyl group eventually realized the formation
Smooth isomerization of 4,4,4-trifluorinated propargylic alcohols 1 opened a new and convenient route to readily get access to the corresponding α,β-unsaturated ketones 4 just by heating a THF solution in the presence of Et3N.
Facile Preparation of CF3-Containing 1-Bromoallenes
作者:Takashi Yamazaki、Yohsuke Watanabe
DOI:10.1055/s-0029-1218383
日期:2009.12
The novel synthetic method is described for preparation of not only 1-bromo- but 1,3-dibromo-1-trifluoromethylated allenes from the corresponding propargylic alcohols with a combination of CBr4 and Ph3P. Selection of the organic solvent employed enabled us to access to these two different allenes quite readily.
Direct synthesis of trifluoroethylated benzofurans from silver-catalyzed annulation of trifluoromethyl propynols with phenols
作者:Bo-Lun Hu、Chao-Fei Wu、Xing-Guo Zhang、Jimin Kim
DOI:10.1016/j.tet.2022.132929
日期:2022.8
efficient method for the synthesis of trifluoroethylated benzofuransfrom trifluoromethyl propynols with general phenols was developed. In the presence of AgNTf2, a variety of trifluoromethyl propynols underwent cascade Friedel-Crafts propargylation/Michael-type addition/1,3-H shift reactions with various phenols successfully to afford the corresponding trifluoroethylated benzofuran in moderate to good